[ARVADOS] created: 260e4dc4c2686fbcf3a6e3979c817d5a2a765c67

git at public.curoverse.com git at public.curoverse.com
Tue Jul 7 22:30:35 EDT 2015


        at  260e4dc4c2686fbcf3a6e3979c817d5a2a765c67 (commit)


commit 260e4dc4c2686fbcf3a6e3979c817d5a2a765c67
Merge: 8375bf0 5608a87
Author: radhika <radhika at curoverse.com>
Date:   Tue Jul 7 22:30:25 2015 -0400

    Merge branch 'master' into 6279-web-shell-client


commit 8375bf07eb52a68c8881164b7f9f89d4a454e3b3
Author: radhika <radhika at curoverse.com>
Date:   Tue Jul 7 22:28:51 2015 -0400

    6279: add login link in VM panel of manage_account page that takes user to shell_in_a_box.

diff --git a/apps/workbench/app/controllers/actions_controller.rb b/apps/workbench/app/controllers/actions_controller.rb
index cbe7e37..77abb63 100644
--- a/apps/workbench/app/controllers/actions_controller.rb
+++ b/apps/workbench/app/controllers/actions_controller.rb
@@ -228,6 +228,24 @@ You can try recreating the collection to get a copy with full provenance data."
     end
   end
 
+  expose_action :webshell do
+    shell_in_a_box_url_config = Rails.configuration.shell_in_a_box_url
+    return render_not_found if not shell_in_a_box_url_config
+
+    @webshell_login = params['login']
+    @webshell_hostname = params['hostname']
+
+    if not shell_in_a_box_url_config.end_with?('/')
+      shell_in_a_box_url_config += '/'
+    end
+    @webshell_url = shell_in_a_box_url_config + @webshell_hostname + '/'
+
+    respond_to do |format|
+      render partial: 'virtual_machines/webshell'
+      return
+    end
+  end
+
   protected
 
   def derive_unique_filename filename, manifest_files
diff --git a/apps/workbench/app/views/users/_manage_virtual_machines.html.erb b/apps/workbench/app/views/users/_manage_virtual_machines.html.erb
index d5d9f52..f3756ac 100644
--- a/apps/workbench/app/views/users/_manage_virtual_machines.html.erb
+++ b/apps/workbench/app/views/users/_manage_virtual_machines.html.erb
@@ -84,6 +84,11 @@
                 <% end %>
               <% end %>
             </td>
+            <td>
+              <% if  Rails.configuration.shell_in_a_box_url %>
+                <%= link_to 'Login', webshell_path(login: @my_vm_logins[vm[:uuid]].first, hostname: vm[:hostname], vm_uuid: vm[:uuid]) %>
+              <% end %>
+            </td>
           </tr>
         <% end %>
       </tbody>
diff --git a/apps/workbench/app/views/virtual_machines/_webshell.html.erb b/apps/workbench/app/views/virtual_machines/_webshell.html.erb
new file mode 100644
index 0000000..89074cd
--- /dev/null
+++ b/apps/workbench/app/views/virtual_machines/_webshell.html.erb
@@ -0,0 +1,48 @@
+<html>
+    <title>Shell login into <%= @webshell_hostname %> </title>
+    <link rel="stylesheet" href="/webshell_styles.css" type="text/css">
+    <style type="text/css">
+      body {
+        margin: 0px;
+      }
+    </style>
+    <script type="text/javascript"><!--
+      (function() {
+        // We would like to hide overflowing lines as this can lead to
+        // visually jarring results if the browser substitutes oversized
+        // Unicode characters from different fonts. Unfortunately, a bug
+        // in Firefox prevents it from allowing multi-line text
+        // selections whenever we change the "overflow" style. So, only
+        // do so for non-Netscape browsers.
+        if (typeof navigator.appName == 'undefined' ||
+            navigator.appName != 'Netscape') {
+          document.write('<style type="text/css">' +
+                         '#vt100 #console div, #vt100 #alt_console div {' +
+                         '  overflow: hidden;' +
+                         '}' +
+                         '</style>');
+        }
+      })();
+
+      function login(username, token) {
+        var sh = new ShellInABox("<%= @webshell_url %>");
+        setTimeout(function() {
+          sh.keysPressed("<%= @webshell_login %>\n");
+          setTimeout(function() {
+            sh.keysPressed("<%= Thread.current[:arvados_api_token] %>\n");
+          }, 1000);
+        }, 1000);
+      }
+    -->
+</script>
+    <link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
+    <script type="text/javascript" src="/shell_in_a_box.js"></script>
+  </head>
+  <!-- Load ShellInABox from a timer as Konqueror sometimes fails to
+       correctly deal with the enclosing frameset (if any), if we do not
+       do this
+   -->
+<body onload="setTimeout('login()', 100)"
+    scroll="no"><noscript>JavaScript must be enabled for ShellInABox</noscript>
+</body>
+</html>
diff --git a/apps/workbench/config/application.default.yml b/apps/workbench/config/application.default.yml
index 4ade8b4..155b9d1 100644
--- a/apps/workbench/config/application.default.yml
+++ b/apps/workbench/config/application.default.yml
@@ -214,3 +214,6 @@ common:
 
   # Ask Arvados API server to compress its response payloads.
   api_response_compression: true
+
+  # ShellInABox URL
+  shell_in_a_box_url: false
diff --git a/apps/workbench/config/routes.rb b/apps/workbench/config/routes.rb
index b2d48ff..7c40d0e 100644
--- a/apps/workbench/config/routes.rb
+++ b/apps/workbench/config/routes.rb
@@ -93,6 +93,7 @@ ArvadosWorkbench::Application.routes.draw do
   get 'actions' => 'actions#show'
   get 'websockets' => 'websocket#index'
   post "combine_selected" => 'actions#combine_selected_files_into_collection'
+  get "webshell" => 'actions#webshell'
 
   root :to => 'projects#index'
 
diff --git a/apps/workbench/public/keyboard.html b/apps/workbench/public/keyboard.html
new file mode 100644
index 0000000..6a95f3b
--- /dev/null
+++ b/apps/workbench/public/keyboard.html
@@ -0,0 +1,62 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xml:lang="en" lang="en">
+<head>
+</head>
+<body><pre class="box"><div
+  ><i id="27">Esc</i><i id="112">F1</i><i id="113">F2</i><i id="114">F3</i
+  ><i id="115">F4</i><i id="116">F5</i><i id="117">F6</i><i id="118">F7</i
+  ><i id="119">F8</i><i id="120">F9</i><i id="121">F10</i><i id="122">F11</i
+  ><i id="123">F12</i><br
+  /><b><span class="unshifted">`</span><span class="shifted">~</span></b
+    ><b><span class="unshifted">1</span><span class="shifted">!</span></b
+    ><b><span class="unshifted">2</span><span class="shifted">@</span></b
+    ><b><span class="unshifted">3</span><span class="shifted">#</span></b
+    ><b><span class="unshifted">4</span><span class="shifted">$</span></b
+    ><b><span class="unshifted">5</span><span class="shifted">%</span></b
+    ><b><span class="unshifted">6</span><span class="shifted">^</span></b
+    ><b><span class="unshifted">7</span><span class="shifted">&</span></b
+    ><b><span class="unshifted">8</span><span class="shifted">*</span></b
+    ><b><span class="unshifted">9</span><span class="shifted">(</span></b
+    ><b><span class="unshifted">0</span><span class="shifted">)</span></b
+    ><b><span class="unshifted">-</span><span class="shifted">_</span></b
+    ><b><span class="unshifted">=</span><span class="shifted">+</span></b
+    ><i id="8"> ← </i
+    ><br
+  /><i id="9">Tab</i
+    ><b>Q</b><b>W</b><b>E</b><b>R</b><b>T</b><b>Y</b><b>U</b><b>I</b><b>O</b
+    ><b>P</b
+    ><b><span class="unshifted">[</span><span class="shifted">{</span></b
+    ><b><span class="unshifted">]</span><span class="shifted">}</span></b
+    ><b><span class="unshifted">\</span><span class="shifted">|</span></b
+    ><br
+  /><u>Tab  </u
+    ><b>A</b><b>S</b><b>D</b><b>F</b><b>G</b><b>H</b><b>J</b><b>K</b><b>L</b
+    ><b><span class="unshifted">;</span><span class="shifted">:</span></b
+    ><b><span class="unshifted">'</span><span class="shifted">"</span></b
+    ><i id="13">Enter</i
+    ><br
+  /><u>  </u
+    ><i id="16">Shift</i
+    ><b>Z</b><b>X</b><b>C</b><b>V</b><b>B</b><b>N</b><b>M</b
+    ><b><span class="unshifted">,</span><span class="shifted"><</span></b
+    ><b><span class="unshifted">.</span><span class="shifted">></span></b
+    ><b><span class="unshifted">/</span><span class="shifted">?</span></b
+    ><i id="16">Shift</i
+    ><br
+  /><u>XXX</u
+    ><i id="17">Ctrl</i
+    ><i id="18">Alt</i
+    ><i style="width: 25ex">&nbsp</i
+  ></div
+  >   <div
+    ><i id="45">Ins</i><i id="46">Del</i><i id="36">Home</i><i id="35">End</i
+    ><br
+    /><u> </u><br
+    /><u> </u><br
+    /><u>Ins</u><s> </s><b id="38">↑</b><s> </s><u> </u
+      ><b id="33">⇑</b><br
+    /><u>Ins</u><b id="37">←</b><b id="40">↓</b
+      ><b id="39">→</b><u> </u><b id="34">⇓</b
+  ></div
+></pre></body></html>
diff --git a/apps/workbench/public/keyboard.png b/apps/workbench/public/keyboard.png
new file mode 100644
index 0000000..feef519
Binary files /dev/null and b/apps/workbench/public/keyboard.png differ
diff --git a/apps/workbench/public/shell_in_a_box.js b/apps/workbench/public/shell_in_a_box.js
new file mode 100644
index 0000000..8a3e356
--- /dev/null
+++ b/apps/workbench/public/shell_in_a_box.js
@@ -0,0 +1,4824 @@
+// ShellInABox.js -- Use XMLHttpRequest to provide an AJAX terminal emulator.
+// Copyright (C) 2008-2010 Markus Gutschke <markus at shellinabox.com>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// In addition to these license terms, the author grants the following
+// additional rights:
+//
+// If you modify this program, or any covered work, by linking or
+// combining it with the OpenSSL project's OpenSSL library (or a
+// modified version of that library), containing parts covered by the
+// terms of the OpenSSL or SSLeay licenses, the author
+// grants you additional permission to convey the resulting work.
+// Corresponding Source for a non-source form of such a combination
+// shall include the source code for the parts of OpenSSL used as well
+// as that of the covered work.
+//
+// You may at your option choose to remove this additional permission from
+// the work, or from any part of it.
+//
+// It is possible to build this program in a way that it loads OpenSSL
+// libraries at run-time. If doing so, the following notices are required
+// by the OpenSSL and SSLeay licenses:
+//
+// This product includes software developed by the OpenSSL Project
+// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
+//
+// This product includes cryptographic software written by Eric Young
+// (eay at cryptsoft.com)
+//
+//
+// The most up-to-date version of this program is always available from
+// http://shellinabox.com
+//
+//
+// Notes:
+//
+// The author believes that for the purposes of this license, you meet the
+// requirements for publishing the source code, if your web server publishes
+// the source in unmodified form (i.e. with licensing information, comments,
+// formatting, and identifier names intact). If there are technical reasons
+// that require you to make changes to the source code when serving the
+// JavaScript (e.g to remove pre-processor directives from the source), these
+// changes should be done in a reversible fashion.
+//
+// The author does not consider websites that reference this script in
+// unmodified form, and web servers that serve this script in unmodified form
+// to be derived works. As such, they are believed to be outside of the
+// scope of this license and not subject to the rights or restrictions of the
+// GNU General Public License.
+//
+// If in doubt, consult a legal professional familiar with the laws that
+// apply in your country.
+
+// #define XHR_UNITIALIZED 0
+// #define XHR_OPEN        1
+// #define XHR_SENT        2
+// #define XHR_RECEIVING   3
+// #define XHR_LOADED      4
+
+// IE does not define XMLHttpRequest by default, so we provide a suitable
+// wrapper.
+if (typeof XMLHttpRequest == 'undefined') {
+  XMLHttpRequest = function() {
+    try { return new ActiveXObject('Msxml2.XMLHTTP.6.0');} catch (e) { }
+    try { return new ActiveXObject('Msxml2.XMLHTTP.3.0');} catch (e) { }
+    try { return new ActiveXObject('Msxml2.XMLHTTP');    } catch (e) { }
+    try { return new ActiveXObject('Microsoft.XMLHTTP'); } catch (e) { }
+    throw new Error('');
+  };
+}
+
+function extend(subClass, baseClass) {
+  function inheritance() { }
+  inheritance.prototype          = baseClass.prototype;
+  subClass.prototype             = new inheritance();
+  subClass.prototype.constructor = subClass;
+  subClass.prototype.superClass  = baseClass.prototype;
+};
+
+function ShellInABox(url, container) {
+  if (url == undefined) {
+    this.rooturl    = document.location.href;
+    this.url        = document.location.href.replace(/[?#].*/, '');
+  } else {
+    this.rooturl    = url;
+    this.url        = url;
+  }
+  if (document.location.hash != '') {
+    var hash        = decodeURIComponent(document.location.hash).
+                      replace(/^#/, '');
+    this.nextUrl    = hash.replace(/,.*/, '');
+    this.session    = hash.replace(/[^,]*,/, '');
+  } else {
+    this.nextUrl    = this.url;
+    this.session    = null;
+  }
+  this.pendingKeys  = '';
+  this.keysInFlight = false;
+  this.connected    = false;
+  this.superClass.constructor.call(this, container);
+
+  // We have to initiate the first XMLHttpRequest from a timer. Otherwise,
+  // Chrome never realizes that the page has loaded.
+  setTimeout(function(shellInABox) {
+               return function() {
+                 shellInABox.sendRequest();
+               };
+             }(this), 1);
+};
+extend(ShellInABox, VT100);
+
+ShellInABox.prototype.sessionClosed = function() {
+  try {
+    this.connected    = false;
+    if (this.session) {
+      this.session    = undefined;
+      if (this.cursorX > 0) {
+        this.vt100('\r\n');
+      }
+      this.vt100('Session closed.');
+    }
+    this.showReconnect(true);
+  } catch (e) {
+  }
+};
+
+ShellInABox.prototype.reconnect = function() {
+  this.showReconnect(false);
+  if (!this.session) {
+    if (document.location.hash != '') {
+      // A shellinaboxd daemon launched from a CGI only allows a single
+      // session. In order to reconnect, we must reload the frame definition
+      // and obtain a new port number. As this is a different origin, we
+      // need to get enclosing page to help us.
+      parent.location        = this.nextUrl;
+    } else {
+      if (this.url != this.nextUrl) {
+        document.location.replace(this.nextUrl);
+      } else {
+        this.pendingKeys     = '';
+        this.keysInFlight    = false;
+        this.reset(true);
+        this.sendRequest();
+      }
+    }
+  }
+  return false;
+};
+
+ShellInABox.prototype.sendRequest = function(request) {
+  if (request == undefined) {
+    request                  = new XMLHttpRequest();
+  }
+  request.open('POST', this.url + '?', true);
+  request.setRequestHeader('Cache-Control', 'no-cache');
+  request.setRequestHeader('Content-Type',
+                           'application/x-www-form-urlencoded; charset=utf-8');
+  var content                = 'width=' + this.terminalWidth +
+                               '&height=' + this.terminalHeight +
+                               (this.session ? '&session=' +
+                                encodeURIComponent(this.session) : '&rooturl='+
+                                encodeURIComponent(this.rooturl));
+  request.setRequestHeader('Content-Length', content.length);
+
+  request.onreadystatechange = function(shellInABox) {
+    return function() {
+             try {
+               return shellInABox.onReadyStateChange(request);
+             } catch (e) {
+               shellInABox.sessionClosed();
+             }
+           }
+    }(this);
+  request.send(content);
+};
+
+ShellInABox.prototype.onReadyStateChange = function(request) {
+  if (request.readyState == 4 /* XHR_LOADED */) {
+    if (request.status == 200) {
+      this.connected = true;
+      var response   = eval('(' + request.responseText + ')');
+      if (response.data) {
+        this.vt100(response.data);
+      }
+
+      if (!response.session ||
+          this.session && this.session != response.session) {
+        this.sessionClosed();
+      } else {
+        this.session = response.session;
+        this.sendRequest(request);
+      }
+    } else if (request.status == 0) {
+      // Time Out
+      this.sendRequest(request);
+    } else {
+      this.sessionClosed();
+    }
+  }
+};
+
+ShellInABox.prototype.sendKeys = function(keys) {
+  if (!this.connected) {
+    return;
+  }
+  if (this.keysInFlight || this.session == undefined) {
+    this.pendingKeys          += keys;
+  } else {
+    this.keysInFlight          = true;
+    keys                       = this.pendingKeys + keys;
+    this.pendingKeys           = '';
+    var request                = new XMLHttpRequest();
+    request.open('POST', this.url + '?', true);
+    request.setRequestHeader('Cache-Control', 'no-cache');
+    request.setRequestHeader('Content-Type',
+                           'application/x-www-form-urlencoded; charset=utf-8');
+    var content                = 'width=' + this.terminalWidth +
+                                 '&height=' + this.terminalHeight +
+                                 '&session=' +encodeURIComponent(this.session)+
+                                 '&keys=' + encodeURIComponent(keys);
+    request.setRequestHeader('Content-Length', content.length);
+    request.onreadystatechange = function(shellInABox) {
+      return function() {
+               try {
+                 return shellInABox.keyPressReadyStateChange(request);
+               } catch (e) {
+               }
+             }
+      }(this);
+    request.send(content);
+  }
+};
+
+ShellInABox.prototype.keyPressReadyStateChange = function(request) {
+  if (request.readyState == 4 /* XHR_LOADED */) {
+    this.keysInFlight = false;
+    if (this.pendingKeys) {
+      this.sendKeys('');
+    }
+  }
+};
+
+ShellInABox.prototype.keysPressed = function(ch) {
+  var hex = '0123456789ABCDEF';
+  var s   = '';
+  for (var i = 0; i < ch.length; i++) {
+    var c = ch.charCodeAt(i);
+    if (c < 128) {
+      s += hex.charAt(c >> 4) + hex.charAt(c & 0xF);
+    } else if (c < 0x800) {
+      s += hex.charAt(0xC +  (c >> 10)       ) +
+           hex.charAt(       (c >>  6) & 0xF ) +
+           hex.charAt(0x8 + ((c >>  4) & 0x3)) +
+           hex.charAt(        c        & 0xF );
+    } else if (c < 0x10000) {
+      s += 'E'                                 +
+           hex.charAt(       (c >> 12)       ) +
+           hex.charAt(0x8 + ((c >> 10) & 0x3)) +
+           hex.charAt(       (c >>  6) & 0xF ) +
+           hex.charAt(0x8 + ((c >>  4) & 0x3)) +
+           hex.charAt(        c        & 0xF );
+    } else if (c < 0x110000) {
+      s += 'F'                                 +
+           hex.charAt(       (c >> 18)       ) +
+           hex.charAt(0x8 + ((c >> 16) & 0x3)) +
+           hex.charAt(       (c >> 12) & 0xF ) +
+           hex.charAt(0x8 + ((c >> 10) & 0x3)) +
+           hex.charAt(       (c >>  6) & 0xF ) +
+           hex.charAt(0x8 + ((c >>  4) & 0x3)) +
+           hex.charAt(        c        & 0xF );
+    }
+  }
+  this.sendKeys(s);
+};
+
+ShellInABox.prototype.resized = function(w, h) {
+  // Do not send a resize request until we are fully initialized.
+  if (this.session) {
+    // sendKeys() always transmits the current terminal size. So, flush all
+    // pending keys.
+    this.sendKeys('');
+  }
+};
+
+ShellInABox.prototype.toggleSSL = function() {
+  if (document.location.hash != '') {
+    if (this.nextUrl.match(/\?plain$/)) {
+      this.nextUrl    = this.nextUrl.replace(/\?plain$/, '');
+    } else {
+      this.nextUrl    = this.nextUrl.replace(/[?#].*/, '') + '?plain';
+    }
+    if (!this.session) {
+      parent.location = this.nextUrl;
+    }
+  } else {
+    this.nextUrl      = this.nextUrl.match(/^https:/)
+           ? this.nextUrl.replace(/^https:/, 'http:').replace(/\/*$/, '/plain')
+           : this.nextUrl.replace(/^http/, 'https').replace(/\/*plain$/, '');
+  }
+  if (this.nextUrl.match(/^[:]*:\/\/[^/]*$/)) {
+    this.nextUrl     += '/';
+  }
+  if (this.session && this.nextUrl != this.url) {
+    alert('This change will take effect the next time you login.');
+  }
+};
+
+ShellInABox.prototype.extendContextMenu = function(entries, actions) {
+  // Modify the entries and actions in place, adding any locally defined
+  // menu entries.
+  var oldActions            = [ ];
+  for (var i = 0; i < actions.length; i++) {
+    oldActions[i]           = actions[i];
+  }
+  for (var node = entries.firstChild, i = 0, j = 0; node;
+       node = node.nextSibling) {
+    if (node.tagName == 'LI') {
+      actions[i++]          = oldActions[j++];
+      if (node.id == "endconfig") {
+        node.id             = '';
+        if (typeof serverSupportsSSL != 'undefined' && serverSupportsSSL &&
+            !(typeof disableSSLMenu != 'undefined' && disableSSLMenu)) {
+          // If the server supports both SSL and plain text connections,
+          // provide a menu entry to switch between the two.
+          var newNode       = document.createElement('li');
+          var isSecure;
+          if (document.location.hash != '') {
+            isSecure        = !this.nextUrl.match(/\?plain$/);
+          } else {
+            isSecure        =  this.nextUrl.match(/^https:/);
+          }
+          newNode.innerHTML = (isSecure ? '✔ ' : '') + 'Secure';
+          if (node.nextSibling) {
+            entries.insertBefore(newNode, node.nextSibling);
+          } else {
+            entries.appendChild(newNode);
+          }
+          actions[i++]      = this.toggleSSL;
+          node              = newNode;
+        }
+        node.id             = 'endconfig';
+      }
+    }
+  }
+  
+};
+
+ShellInABox.prototype.about = function() {
+  alert("Shell In A Box version " + "2.10 (revision 239)" +
+        "\nCopyright 2008-2010 by Markus Gutschke\n" +
+        "For more information check http://shellinabox.com" +
+        (typeof serverSupportsSSL != 'undefined' && serverSupportsSSL ?
+         "\n\n" +
+         "This product includes software developed by the OpenSSL Project\n" +
+         "for use in the OpenSSL Toolkit. (http://www.openssl.org/)\n" +
+         "\n" +
+         "This product includes cryptographic software written by " +
+         "Eric Young\n(eay at cryptsoft.com)" :
+         ""));
+};
+
+
+// VT100.js -- JavaScript based terminal emulator
+// Copyright (C) 2008-2010 Markus Gutschke <markus at shellinabox.com>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with this program; if not, write to the Free Software Foundation, Inc.,
+// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+//
+// In addition to these license terms, the author grants the following
+// additional rights:
+//
+// If you modify this program, or any covered work, by linking or
+// combining it with the OpenSSL project's OpenSSL library (or a
+// modified version of that library), containing parts covered by the
+// terms of the OpenSSL or SSLeay licenses, the author
+// grants you additional permission to convey the resulting work.
+// Corresponding Source for a non-source form of such a combination
+// shall include the source code for the parts of OpenSSL used as well
+// as that of the covered work.
+//
+// You may at your option choose to remove this additional permission from
+// the work, or from any part of it.
+//
+// It is possible to build this program in a way that it loads OpenSSL
+// libraries at run-time. If doing so, the following notices are required
+// by the OpenSSL and SSLeay licenses:
+//
+// This product includes software developed by the OpenSSL Project
+// for use in the OpenSSL Toolkit. (http://www.openssl.org/)
+//
+// This product includes cryptographic software written by Eric Young
+// (eay at cryptsoft.com)
+//
+//
+// The most up-to-date version of this program is always available from
+// http://shellinabox.com
+//
+//
+// Notes:
+//
+// The author believes that for the purposes of this license, you meet the
+// requirements for publishing the source code, if your web server publishes
+// the source in unmodified form (i.e. with licensing information, comments,
+// formatting, and identifier names intact). If there are technical reasons
+// that require you to make changes to the source code when serving the
+// JavaScript (e.g to remove pre-processor directives from the source), these
+// changes should be done in a reversible fashion.
+//
+// The author does not consider websites that reference this script in
+// unmodified form, and web servers that serve this script in unmodified form
+// to be derived works. As such, they are believed to be outside of the
+// scope of this license and not subject to the rights or restrictions of the
+// GNU General Public License.
+//
+// If in doubt, consult a legal professional familiar with the laws that
+// apply in your country.
+
+// #define ESnormal        0
+// #define ESesc           1
+// #define ESsquare        2
+// #define ESgetpars       3
+// #define ESgotpars       4
+// #define ESdeviceattr    5
+// #define ESfunckey       6
+// #define EShash          7
+// #define ESsetG0         8
+// #define ESsetG1         9
+// #define ESsetG2        10
+// #define ESsetG3        11
+// #define ESbang         12
+// #define ESpercent      13
+// #define ESignore       14
+// #define ESnonstd       15
+// #define ESpalette      16
+// #define EStitle        17
+// #define ESss2          18
+// #define ESss3          19
+
+// #define ATTR_DEFAULT   0x00F0
+// #define ATTR_REVERSE   0x0100
+// #define ATTR_UNDERLINE 0x0200
+// #define ATTR_DIM       0x0400
+// #define ATTR_BRIGHT    0x0800
+// #define ATTR_BLINK     0x1000
+
+// #define MOUSE_DOWN     0
+// #define MOUSE_UP       1
+// #define MOUSE_CLICK    2
+
+function VT100(container) {
+  if (typeof linkifyURLs == 'undefined' || linkifyURLs <= 0) {
+    this.urlRE            = null;
+  } else {
+    this.urlRE            = new RegExp(
+    // Known URL protocol are "http", "https", and "ftp".
+    '(?:http|https|ftp)://' +
+
+    // Optionally allow username and passwords.
+    '(?:[^:@/ \u00A0]*(?::[^@/ \u00A0]*)?@)?' +
+
+    // Hostname.
+    '(?:[1-9][0-9]{0,2}(?:[.][1-9][0-9]{0,2}){3}|' +
+    '[0-9a-fA-F]{0,4}(?::{1,2}[0-9a-fA-F]{1,4})+|' +
+    '(?!-)[^[!"#$%&\'()*+,/:;<=>?@\\^_`{|}~\u0000- \u007F-\u00A0]+)' +
+
+    // Port
+    '(?::[1-9][0-9]*)?' +
+
+    // Path.
+    '(?:/(?:(?![/ \u00A0]|[,.)}"\u0027!]+[ \u00A0]|[,.)}"\u0027!]+$).)*)*|' +
+
+    (linkifyURLs <= 1 ? '' :
+    // Also support URLs without a protocol (assume "http").
+    // Optional username and password.
+    '(?:[^:@/ \u00A0]*(?::[^@/ \u00A0]*)?@)?' +
+
+    // Hostnames must end with a well-known top-level domain or must be
+    // numeric.
+    '(?:[1-9][0-9]{0,2}(?:[.][1-9][0-9]{0,2}){3}|' +
+    'localhost|' +
+    '(?:(?!-)' +
+        '[^.[!"#$%&\'()*+,/:;<=>?@\\^_`{|}~\u0000- \u007F-\u00A0]+[.]){2,}' +
+    '(?:(?:com|net|org|edu|gov|aero|asia|biz|cat|coop|info|int|jobs|mil|mobi|'+
+    'museum|name|pro|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|' +
+    'au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|' +
+    'ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|' +
+    'dz|ec|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|' +
+    'gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|' +
+    'ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|' +
+    'lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|' +
+    'mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|' +
+    'pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|' +
+    'sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|' +
+    'tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|' +
+    'yu|za|zm|zw|arpa)(?![a-zA-Z0-9])|[Xx][Nn]--[-a-zA-Z0-9]+))' +
+
+    // Port
+    '(?::[1-9][0-9]{0,4})?' +
+
+    // Path.
+    '(?:/(?:(?![/ \u00A0]|[,.)}"\u0027!]+[ \u00A0]|[,.)}"\u0027!]+$).)*)*|') +
+
+    // In addition, support e-mail address. Optionally, recognize "mailto:"
+    '(?:mailto:)' + (linkifyURLs <= 1 ? '' : '?') +
+
+    // Username:
+    '[-_.+a-zA-Z0-9]+@' +
+
+    // Hostname.
+    '(?!-)[-a-zA-Z0-9]+(?:[.](?!-)[-a-zA-Z0-9]+)?[.]' +
+    '(?:(?:com|net|org|edu|gov|aero|asia|biz|cat|coop|info|int|jobs|mil|mobi|'+
+    'museum|name|pro|tel|travel|ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|' +
+    'au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|bj|bm|bn|bo|br|bs|bt|bv|bw|by|bz|' +
+    'ca|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|' +
+    'dz|ec|ee|eg|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|' +
+    'gm|gn|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|il|im|in|io|iq|' +
+    'ir|is|it|je|jm|jo|jp|ke|kg|kh|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|' +
+    'lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mm|mn|mo|mp|mq|mr|ms|mt|mu|' +
+    'mv|mw|mx|my|mz|na|nc|ne|nf|ng|ni|nl|no|np|nr|nu|nz|om|pa|pe|pf|pg|ph|' +
+    'pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|' +
+    'sj|sk|sl|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|' +
+    'tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|ye|yt|' +
+    'yu|za|zm|zw|arpa)(?![a-zA-Z0-9])|[Xx][Nn]--[-a-zA-Z0-9]+)' +
+
+    // Optional arguments
+    '(?:[?](?:(?![ \u00A0]|[,.)}"\u0027!]+[ \u00A0]|[,.)}"\u0027!]+$).)*)?');
+  }
+  this.getUserSettings();
+  this.initializeElements(container);
+  this.maxScrollbackLines = 500;
+  this.npar               = 0;
+  this.par                = [ ];
+  this.isQuestionMark     = false;
+  this.savedX             = [ ];
+  this.savedY             = [ ];
+  this.savedAttr          = [ ];
+  this.savedUseGMap       = 0;
+  this.savedGMap          = [ this.Latin1Map, this.VT100GraphicsMap,
+                              this.CodePage437Map, this.DirectToFontMap ];
+  this.savedValid         = [ ];
+  this.respondString      = '';
+  this.titleString        = '';
+  this.internalClipboard  = undefined;
+  this.reset(true);
+}
+
+VT100.prototype.reset = function(clearHistory) {
+  this.isEsc                                         = 0 /* ESnormal */;
+  this.needWrap                                      = false;
+  this.autoWrapMode                                  = true;
+  this.dispCtrl                                      = false;
+  this.toggleMeta                                    = false;
+  this.insertMode                                    = false;
+  this.applKeyMode                                   = false;
+  this.cursorKeyMode                                 = false;
+  this.crLfMode                                      = false;
+  this.offsetMode                                    = false;
+  this.mouseReporting                                = false;
+  this.printing                                      = false;
+  if (typeof this.printWin != 'undefined' &&
+      this.printWin && !this.printWin.closed) {
+    this.printWin.close();
+  }
+  this.printWin                                      = null;
+  this.utfEnabled                                    = this.utfPreferred;
+  this.utfCount                                      = 0;
+  this.utfChar                                       = 0;
+  this.color                                         = 'ansi0 bgAnsi15';
+  this.style                                         = '';
+  this.attr                                          = 0x00F0 /* ATTR_DEFAULT */;
+  this.useGMap                                       = 0;
+  this.GMap                                          = [ this.Latin1Map,
+                                                         this.VT100GraphicsMap,
+                                                         this.CodePage437Map,
+                                                         this.DirectToFontMap];
+  this.translate                                     = this.GMap[this.useGMap];
+  this.top                                           = 0;
+  this.bottom                                        = this.terminalHeight;
+  this.lastCharacter                                 = ' ';
+  this.userTabStop                                   = [ ];
+
+  if (clearHistory) {
+    for (var i = 0; i < 2; i++) {
+      while (this.console[i].firstChild) {
+        this.console[i].removeChild(this.console[i].firstChild);
+      }
+    }
+  }
+
+  this.enableAlternateScreen(false);
+
+  var wasCompressed                                  = false;
+  var transform                                      = this.getTransformName();
+  if (transform) {
+    for (var i = 0; i < 2; ++i) {
+      wasCompressed                  |= this.console[i].style[transform] != '';
+      this.console[i].style[transform]               = '';
+    }
+    this.cursor.style[transform]                     = '';
+    this.space.style[transform]                      = '';
+    if (transform == 'filter') {
+      this.console[this.currentScreen].style.width   = '';
+    }
+  }
+  this.scale                                         = 1.0;
+  if (wasCompressed) {
+    this.resizer();
+  }
+
+  this.gotoXY(0, 0);
+  this.showCursor();
+  this.isInverted                                    = false;
+  this.refreshInvertedState();
+  this.clearRegion(0, 0, this.terminalWidth, this.terminalHeight,
+                   this.color, this.style);
+};
+
+VT100.prototype.addListener = function(elem, event, listener) {
+  try {
+    if (elem.addEventListener) {
+      elem.addEventListener(event, listener, false);
+    } else {
+      elem.attachEvent('on' + event, listener);
+    }
+  } catch (e) {
+  }
+};
+
+VT100.prototype.getUserSettings = function() {
+  // Compute hash signature to identify the entries in the userCSS menu.
+  // If the menu is unchanged from last time, default values can be
+  // looked up in a cookie associated with this page.
+  this.signature            = 3;
+  this.utfPreferred         = true;
+  this.visualBell           = typeof suppressAllAudio != 'undefined' &&
+                              suppressAllAudio;
+  this.autoprint            = true;
+  this.softKeyboard         = false;
+  this.blinkingCursor       = true;
+  if (this.visualBell) {
+    this.signature          = Math.floor(16807*this.signature + 1) %
+                                         ((1 << 31) - 1);
+  }
+  if (typeof userCSSList != 'undefined') {
+    for (var i = 0; i < userCSSList.length; ++i) {
+      var label             = userCSSList[i][0];
+      for (var j = 0; j < label.length; ++j) {
+        this.signature      = Math.floor(16807*this.signature+
+                                         label.charCodeAt(j)) %
+                                         ((1 << 31) - 1);
+      }
+      if (userCSSList[i][1]) {
+        this.signature      = Math.floor(16807*this.signature + 1) %
+                                         ((1 << 31) - 1);
+      }
+    }
+  }
+
+  var key                   = 'shellInABox=' + this.signature + ':';
+  var settings              = document.cookie.indexOf(key);
+  if (settings >= 0) {
+    settings                = document.cookie.substr(settings + key.length).
+                                                   replace(/([0-1]*).*/, "$1");
+    if (settings.length == 5 + (typeof userCSSList == 'undefined' ?
+                                0 : userCSSList.length)) {
+      this.utfPreferred     = settings.charAt(0) != '0';
+      this.visualBell       = settings.charAt(1) != '0';
+      this.autoprint        = settings.charAt(2) != '0';
+      this.softKeyboard     = settings.charAt(3) != '0';
+      this.blinkingCursor   = settings.charAt(4) != '0';
+      if (typeof userCSSList != 'undefined') {
+        for (var i = 0; i < userCSSList.length; ++i) {
+          userCSSList[i][2] = settings.charAt(i + 5) != '0';
+        }
+      }
+    }
+  }
+  this.utfEnabled           = this.utfPreferred;
+};
+
+VT100.prototype.storeUserSettings = function() {
+  var settings  = 'shellInABox=' + this.signature + ':' +
+                  (this.utfEnabled     ? '1' : '0') +
+                  (this.visualBell     ? '1' : '0') +
+                  (this.autoprint      ? '1' : '0') +
+                  (this.softKeyboard   ? '1' : '0') +
+                  (this.blinkingCursor ? '1' : '0');
+  if (typeof userCSSList != 'undefined') {
+    for (var i = 0; i < userCSSList.length; ++i) {
+      settings += userCSSList[i][2] ? '1' : '0';
+    }
+  }
+  var d         = new Date();
+  d.setDate(d.getDate() + 3653);
+  document.cookie = settings + ';expires=' + d.toGMTString();
+};
+
+VT100.prototype.initializeUserCSSStyles = function() {
+  this.usercssActions                    = [];
+  if (typeof userCSSList != 'undefined') {
+    var menu                             = '';
+    var group                            = '';
+    var wasSingleSel                     = 1;
+    var beginOfGroup                     = 0;
+    for (var i = 0; i <= userCSSList.length; ++i) {
+      if (i < userCSSList.length) {
+        var label                        = userCSSList[i][0];
+        var newGroup                     = userCSSList[i][1];
+        var enabled                      = userCSSList[i][2];
+      
+        // Add user style sheet to document
+        var style                        = document.createElement('link');
+        var id                           = document.createAttribute('id');
+        id.nodeValue                     = 'usercss-' + i;
+        style.setAttributeNode(id);
+        var rel                          = document.createAttribute('rel');
+        rel.nodeValue                    = 'stylesheet';
+        style.setAttributeNode(rel);
+        var href                         = document.createAttribute('href');
+        href.nodeValue                   = 'usercss-' + i + '.css';
+        style.setAttributeNode(href);
+        var type                         = document.createAttribute('type');
+        type.nodeValue                   = 'text/css';
+        style.setAttributeNode(type);
+        document.getElementsByTagName('head')[0].appendChild(style);
+        style.disabled                   = !enabled;
+      }
+    
+      // Add entry to menu
+      if (newGroup || i == userCSSList.length) {
+        if (beginOfGroup != 0 && (i - beginOfGroup > 1 || !wasSingleSel)) {
+          // The last group had multiple entries that are mutually exclusive;
+          // or the previous to last group did. In either case, we need to
+          // append a "<hr />" before we can add the last group to the menu.
+          menu                          += '<hr />';
+        }
+        wasSingleSel                     = i - beginOfGroup < 1;
+        menu                            += group;
+        group                            = '';
+
+        for (var j = beginOfGroup; j < i; ++j) {
+          this.usercssActions[this.usercssActions.length] =
+            function(vt100, current, begin, count) {
+
+              // Deselect all other entries in the group, then either select
+              // (for multiple entries in group) or toggle (for on/off entry)
+              // the current entry.
+              return function() {
+                var entry                = vt100.getChildById(vt100.menu,
+                                                              'beginusercss');
+                var i                    = -1;
+                var j                    = -1;
+                for (var c = count; c > 0; ++j) {
+                  if (entry.tagName == 'LI') {
+                    if (++i >= begin) {
+                      --c;
+                      var label          = vt100.usercss.childNodes[j];
+
+                      // Restore label to just the text content
+                      if (typeof label.textContent == 'undefined') {
+                        var s            = label.innerText;
+                        label.innerHTML  = '';
+                        label.appendChild(document.createTextNode(s));
+                      } else {
+                        label.textContent= label.textContent;
+                      }
+
+                      // User style sheets are numbered sequentially
+                      var sheet          = document.getElementById(
+                                                               'usercss-' + i);
+                      if (i == current) {
+                        if (count == 1) {
+                          sheet.disabled = !sheet.disabled;
+                        } else {
+                          sheet.disabled = false;
+                        }
+                        if (!sheet.disabled) {
+                          label.innerHTML= '<img src="enabled.gif" />' +
+                                           label.innerHTML;
+                        }
+                      } else {
+                        sheet.disabled   = true;
+                      }
+                      userCSSList[i][2]  = !sheet.disabled;
+                    }
+                  }
+                  entry                  = entry.nextSibling;
+                }
+
+                // If the font size changed, adjust cursor and line dimensions
+                this.cursor.style.cssText= '';
+                this.cursorWidth         = this.cursor.clientWidth;
+                this.cursorHeight        = this.lineheight.clientHeight;
+                for (i = 0; i < this.console.length; ++i) {
+                  for (var line = this.console[i].firstChild; line;
+                       line = line.nextSibling) {
+                    line.style.height    = this.cursorHeight + 'px';
+                  }
+                }
+                vt100.resizer();
+              };
+            }(this, j, beginOfGroup, i - beginOfGroup);
+        }
+
+        if (i == userCSSList.length) {
+          break;
+        }
+
+        beginOfGroup                     = i;
+      }
+      // Collect all entries in a group, before attaching them to the menu.
+      // This is necessary as we don't know whether this is a group of
+      // mutually exclusive options (which should be separated by "<hr />" on
+      // both ends), or whether this is a on/off toggle, which can be grouped
+      // together with other on/off options.
+      group                             +=
+        '<li>' + (enabled ? '<img src="enabled.gif" />' : '') +
+                 label +
+        '</li>';
+    }
+    this.usercss.innerHTML               = menu;
+  }
+};
+
+VT100.prototype.resetLastSelectedKey = function(e) {
+  var key                          = this.lastSelectedKey;
+  if (!key) {
+    return false;
+  }
+
+  var position                     = this.mousePosition(e);
+
+  // We don't get all the necessary events to reliably reselect a key
+  // if we moved away from it and then back onto it. We approximate the
+  // behavior by remembering the key until either we release the mouse
+  // button (we might never get this event if the mouse has since left
+  // the window), or until we move away too far.
+  var box                          = this.keyboard.firstChild;
+  if (position[0] <  box.offsetLeft + key.offsetWidth ||
+      position[1] <  box.offsetTop + key.offsetHeight ||
+      position[0] >= box.offsetLeft + box.offsetWidth - key.offsetWidth ||
+      position[1] >= box.offsetTop + box.offsetHeight - key.offsetHeight ||
+      position[0] <  box.offsetLeft + key.offsetLeft - key.offsetWidth ||
+      position[1] <  box.offsetTop + key.offsetTop - key.offsetHeight ||
+      position[0] >= box.offsetLeft + key.offsetLeft + 2*key.offsetWidth ||
+      position[1] >= box.offsetTop + key.offsetTop + 2*key.offsetHeight) {
+    if (this.lastSelectedKey.className) log.console('reset: deselecting');
+    this.lastSelectedKey.className = '';
+    this.lastSelectedKey           = undefined;
+  }
+  return false;
+};
+
+VT100.prototype.showShiftState = function(state) {
+  var style              = document.getElementById('shift_state');
+  if (state) {
+    this.setTextContentRaw(style,
+                           '#vt100 #keyboard .shifted {' +
+                             'display: inline }' +
+                           '#vt100 #keyboard .unshifted {' +
+                             'display: none }');
+  } else {
+    this.setTextContentRaw(style, '');
+  }
+  var elems              = this.keyboard.getElementsByTagName('I');
+  for (var i = 0; i < elems.length; ++i) {
+    if (elems[i].id == '16') {
+      elems[i].className = state ? 'selected' : '';
+    }
+  }
+};
+
+VT100.prototype.showCtrlState = function(state) {
+  var ctrl         = this.getChildById(this.keyboard, '17' /* Ctrl */);
+  if (ctrl) {
+    ctrl.className = state ? 'selected' : '';
+  }
+};
+
+VT100.prototype.showAltState = function(state) {
+  var alt         = this.getChildById(this.keyboard, '18' /* Alt */);
+  if (alt) {
+    alt.className = state ? 'selected' : '';
+  }
+};
+
+VT100.prototype.clickedKeyboard = function(e, elem, ch, key, shift, ctrl, alt){
+  var fake      = [ ];
+  fake.charCode = ch;
+  fake.keyCode  = key;
+  fake.ctrlKey  = ctrl;
+  fake.shiftKey = shift;
+  fake.altKey   = alt;
+  fake.metaKey  = alt;
+  return this.handleKey(fake);
+};
+
+VT100.prototype.addKeyBinding = function(elem, ch, key, CH, KEY) {
+  if (elem == undefined) {
+    return;
+  }
+  if (ch == '\u00A0') {
+    //   should be treated as a regular space character.
+    ch                                  = ' ';
+  }
+  if (ch != undefined && CH == undefined) {
+    // For letter keys, we automatically compute the uppercase character code
+    // from the lowercase one.
+    CH                                  = ch.toUpperCase();
+  }
+  if (KEY == undefined && key != undefined) {
+    // Most keys have identically key codes for both lowercase and uppercase
+    // keypresses. Normally, only function keys would have distinct key codes,
+    // whereas regular keys have character codes.
+    KEY                                 = key;
+  } else if (KEY == undefined && CH != undefined) {
+    // For regular keys, copy the character code to the key code.
+    KEY                                 = CH.charCodeAt(0);
+  }
+  if (key == undefined && ch != undefined) {
+    // For regular keys, copy the character code to the key code.
+    key                                 = ch.charCodeAt(0);
+  }
+  // Convert characters to numeric character codes. If the character code
+  // is undefined (i.e. this is a function key), set it to zero.
+  ch                                    = ch ? ch.charCodeAt(0) : 0;
+  CH                                    = CH ? CH.charCodeAt(0) : 0;
+
+  // Mouse down events high light the key. We also set lastSelectedKey. This
+  // is needed to that mouseout/mouseover can keep track of the key that
+  // is currently being clicked.
+  this.addListener(elem, 'mousedown',
+    function(vt100, elem, key) { return function(e) {
+      if ((e.which || e.button) == 1) {
+        if (vt100.lastSelectedKey) {       
+          vt100.lastSelectedKey.className= '';
+        }
+        // Highlight the key while the mouse button is held down.
+        if (key == 16 /* Shift */) {
+          if (!elem.className != vt100.isShift) {
+            vt100.showShiftState(!vt100.isShift);
+          }
+        } else if (key == 17 /* Ctrl */) {
+          if (!elem.className != vt100.isCtrl) {
+            vt100.showCtrlState(!vt100.isCtrl);
+          }
+        } else if (key == 18 /* Alt */) {
+          if (!elem.className != vt100.isAlt) {
+            vt100.showAltState(!vt100.isAlt);
+          }
+        } else {
+          elem.className                  = 'selected';
+        }
+        vt100.lastSelectedKey             = elem;
+      }
+      return false; }; }(this, elem, key));
+  var clicked                           =
+    // Modifier keys update the state of the keyboard, but do not generate
+    // any key clicks that get forwarded to the application.
+    key >= 16 /* Shift */ && key <= 18 /* Alt */ ?
+    function(vt100, elem) { return function(e) {
+      if (elem == vt100.lastSelectedKey) {
+        if (key == 16 /* Shift */) {
+          // The user clicked the Shift key
+          vt100.isShift                 = !vt100.isShift;
+          vt100.showShiftState(vt100.isShift);
+        } else if (key == 17 /* Ctrl */) {
+          vt100.isCtrl                  = !vt100.isCtrl;
+          vt100.showCtrlState(vt100.isCtrl);
+        } else if (key == 18 /* Alt */) {
+          vt100.isAlt                   = !vt100.isAlt;
+          vt100.showAltState(vt100.isAlt);
+        }
+        vt100.lastSelectedKey           = undefined;
+      }
+      if (vt100.lastSelectedKey) {
+        vt100.lastSelectedKey.className = '';
+        vt100.lastSelectedKey           = undefined;
+      }
+      return false; }; }(this, elem) :
+    // Regular keys generate key clicks, when the mouse button is released or
+    // when a mouse click event is received.
+    function(vt100, elem, ch, key, CH, KEY) { return function(e) {
+      if (vt100.lastSelectedKey) {
+        if (elem == vt100.lastSelectedKey) {
+          // The user clicked a key.
+          if (vt100.isShift) {
+            vt100.clickedKeyboard(e, elem, CH, KEY,
+                                  true, vt100.isCtrl, vt100.isAlt);
+          } else {
+            vt100.clickedKeyboard(e, elem, ch, key,
+                                  false, vt100.isCtrl, vt100.isAlt);
+          }
+          vt100.isShift                 = false;
+          vt100.showShiftState(false);
+          vt100.isCtrl                  = false;
+          vt100.showCtrlState(false);
+          vt100.isAlt                   = false;
+          vt100.showAltState(false);
+        }
+        vt100.lastSelectedKey.className = '';
+        vt100.lastSelectedKey           = undefined;
+      }
+      elem.className                    = '';
+      return false; }; }(this, elem, ch, key, CH, KEY);
+  this.addListener(elem, 'mouseup', clicked);
+  this.addListener(elem, 'click', clicked);
+
+  // When moving the mouse away from a key, check if any keys need to be
+  // deselected.
+  this.addListener(elem, 'mouseout',
+    function(vt100, elem, key) { return function(e) {
+      if (key == 16 /* Shift */) {
+        if (!elem.className == vt100.isShift) {
+          vt100.showShiftState(vt100.isShift);
+        }
+      } else if (key == 17 /* Ctrl */) {
+        if (!elem.className == vt100.isCtrl) {
+          vt100.showCtrlState(vt100.isCtrl);
+        }
+      } else if (key == 18 /* Alt */) {
+        if (!elem.className == vt100.isAlt) {
+          vt100.showAltState(vt100.isAlt);
+        }
+      } else if (elem.className) {
+        elem.className                  = '';
+        vt100.lastSelectedKey           = elem;
+      } else if (vt100.lastSelectedKey) {
+        vt100.resetLastSelectedKey(e);
+      }
+      return false; }; }(this, elem, key));
+
+  // When moving the mouse over a key, select it if the user is still holding
+  // the mouse button down (i.e. elem == lastSelectedKey)
+  this.addListener(elem, 'mouseover',
+    function(vt100, elem, key) { return function(e) {
+      if (elem == vt100.lastSelectedKey) {
+        if (key == 16 /* Shift */) {
+          if (!elem.className != vt100.isShift) {
+            vt100.showShiftState(!vt100.isShift);
+          }
+        } else if (key == 17 /* Ctrl */) {
+          if (!elem.className != vt100.isCtrl) {
+            vt100.showCtrlState(!vt100.isCtrl);
+          }
+        } else if (key == 18 /* Alt */) {
+          if (!elem.className != vt100.isAlt) {
+            vt100.showAltState(!vt100.isAlt);
+          }
+        } else if (!elem.className) {
+          elem.className                = 'selected';
+        }
+      } else {
+        vt100.resetLastSelectedKey(e);
+      }
+      return false; }; }(this, elem, key));
+};
+
+VT100.prototype.initializeKeyBindings = function(elem) {
+  if (elem) {
+    if (elem.nodeName == "I" || elem.nodeName == "B") {
+      if (elem.id) {
+        // Function keys. The Javascript keycode is part of the "id"
+        var i     = parseInt(elem.id);
+        if (i) {
+          // If the id does not parse as a number, it is not a keycode.
+          this.addKeyBinding(elem, undefined, i);
+        }
+      } else {
+        var child = elem.firstChild;
+        if (child) {
+          if (child.nodeName == "#text") {
+            // If the key only has a text node as a child, then it is a letter.
+            // Automatically compute the lower and upper case version of the
+            // key.
+            var text = this.getTextContent(child) ||
+                       this.getTextContent(elem);
+            this.addKeyBinding(elem, text.toLowerCase());
+          } else if (child.nextSibling) {
+            // If the key has two children, they are the lower and upper case
+            // character code, respectively.
+            this.addKeyBinding(elem, this.getTextContent(child), undefined,
+                               this.getTextContent(child.nextSibling));
+          }
+        }
+      }
+    }
+  }
+  // Recursively parse all other child nodes.
+  for (elem = elem.firstChild; elem; elem = elem.nextSibling) {
+    this.initializeKeyBindings(elem);
+  }
+};
+
+VT100.prototype.initializeKeyboardButton = function() {
+  // Configure mouse event handlers for button that displays/hides keyboard
+  this.addListener(this.keyboardImage, 'click',
+    function(vt100) { return function(e) {
+      if (vt100.keyboard.style.display != '') {
+        if (vt100.reconnectBtn.style.visibility != '') {
+          vt100.initializeKeyboard();
+          vt100.showSoftKeyboard();
+        }
+      } else {
+        vt100.hideSoftKeyboard();
+        vt100.input.focus();
+      }
+      return false; }; }(this));
+
+  // Enable button that displays keyboard
+  if (this.softKeyboard) {
+    this.keyboardImage.style.visibility = 'visible';
+  }
+};
+
+VT100.prototype.initializeKeyboard = function() {
+  // Only need to initialize the keyboard the very first time. When doing so,
+  // copy the keyboard layout from the iframe.
+  if (this.keyboard.firstChild) {
+    return;
+  }
+  this.keyboard.innerHTML               =
+                                    this.layout.contentDocument.body.innerHTML;
+  var box                               = this.keyboard.firstChild;
+  this.hideSoftKeyboard();
+
+  // Configure mouse event handlers for on-screen keyboard
+  this.addListener(this.keyboard, 'click',
+    function(vt100) { return function(e) {
+      vt100.hideSoftKeyboard();
+      vt100.input.focus();
+      return false; }; }(this));
+  this.addListener(this.keyboard, 'selectstart', this.cancelEvent);
+  this.addListener(box, 'click', this.cancelEvent);
+  this.addListener(box, 'mouseup',
+    function(vt100) { return function(e) {
+      if (vt100.lastSelectedKey) {
+        vt100.lastSelectedKey.className = '';
+        vt100.lastSelectedKey           = undefined;
+      }
+      return false; }; }(this));
+  this.addListener(box, 'mouseout',
+    function(vt100) { return function(e) {
+      return vt100.resetLastSelectedKey(e); }; }(this));
+  this.addListener(box, 'mouseover',
+    function(vt100) { return function(e) {
+      return vt100.resetLastSelectedKey(e); }; }(this));
+
+  // Configure SHIFT key behavior
+  var style                             = document.createElement('style');
+  var id                                = document.createAttribute('id');
+  id.nodeValue                          = 'shift_state';
+  style.setAttributeNode(id);
+  var type                              = document.createAttribute('type');
+  type.nodeValue                        = 'text/css';
+  style.setAttributeNode(type);
+  document.getElementsByTagName('head')[0].appendChild(style);
+
+  // Set up key bindings
+  this.initializeKeyBindings(box);
+};
+
+VT100.prototype.initializeElements = function(container) {
+  // If the necessary objects have not already been defined in the HTML
+  // page, create them now.
+  if (container) {
+    this.container             = container;
+  } else if (!(this.container  = document.getElementById('vt100'))) {
+    this.container             = document.createElement('div');
+    this.container.id          = 'vt100';
+    document.body.appendChild(this.container);
+  }
+
+  if (!this.getChildById(this.container, 'reconnect')   ||
+      !this.getChildById(this.container, 'menu')        ||
+      !this.getChildById(this.container, 'keyboard')    ||
+      !this.getChildById(this.container, 'kbd_button')  ||
+      !this.getChildById(this.container, 'kbd_img')     ||
+      !this.getChildById(this.container, 'layout')      ||
+      !this.getChildById(this.container, 'scrollable')  ||
+      !this.getChildById(this.container, 'console')     ||
+      !this.getChildById(this.container, 'alt_console') ||
+      !this.getChildById(this.container, 'ieprobe')     ||
+      !this.getChildById(this.container, 'padding')     ||
+      !this.getChildById(this.container, 'cursor')      ||
+      !this.getChildById(this.container, 'lineheight')  ||
+      !this.getChildById(this.container, 'usercss')     ||
+      !this.getChildById(this.container, 'space')       ||
+      !this.getChildById(this.container, 'input')       ||
+      !this.getChildById(this.container, 'cliphelper')) {
+    // Only enable the "embed" object, if we have a suitable plugin. Otherwise,
+    // we might get a pointless warning that a suitable plugin is not yet
+    // installed. If in doubt, we'd rather just stay silent.
+    var embed                  = '';
+    try {
+      if (typeof navigator.mimeTypes["audio/x-wav"].enabledPlugin.name !=
+          'undefined') {
+        embed                  = typeof suppressAllAudio != 'undefined' &&
+                                 suppressAllAudio ? "" :
+        '<embed classid="clsid:02BF25D5-8C17-4B23-BC80-D3488ABDDC6B" ' +
+                       'id="beep_embed" ' +
+                       'src="beep.wav" ' +
+                       'autostart="false" ' +
+                       'volume="100" ' +
+                       'enablejavascript="true" ' +
+                       'type="audio/x-wav" ' +
+                       'height="16" ' +
+                       'width="200" ' +
+                       'style="position:absolute;left:-1000px;top:-1000px" />';
+      }
+    } catch (e) {
+    }
+
+    this.container.innerHTML   =
+                       '<div id="reconnect" style="visibility: hidden">' +
+                         '<input type="button" value="Connect" ' +
+                                'onsubmit="return false" />' +
+                       '</div>' +
+                       '<div id="cursize" style="visibility: hidden">' +
+                       '</div>' +
+                       '<div id="menu"></div>' +
+                       '<div id="keyboard" unselectable="on">' +
+                       '</div>' +
+                       '<div id="scrollable">' +
+                         '<table id="kbd_button">' +
+                           '<tr><td width="100%"> </td>' +
+                           '<td><img id="kbd_img" src="keyboard.png" /></td>' +
+                           '<td>    </td></tr>' +
+                         '</table>' +
+                         '<pre id="lineheight"> </pre>' +
+                         '<pre id="console">' +
+                           '<pre></pre>' +
+                           '<div id="ieprobe"><span> </span></div>' +
+                         '</pre>' +
+                         '<pre id="alt_console" style="display: none"></pre>' +
+                         '<div id="padding"></div>' +
+                         '<pre id="cursor"> </pre>' +
+                       '</div>' +
+                       '<div class="hidden">' +
+                         '<div id="usercss"></div>' +
+                         '<pre><div><span id="space"></span></div></pre>' +
+                         '<input type="textfield" id="input" autocorrect="off" autocapitalize="off" />' +
+                         '<input type="textfield" id="cliphelper" />' +
+                         (typeof suppressAllAudio != 'undefined' &&
+                          suppressAllAudio ? "" :
+                         embed + '<bgsound id="beep_bgsound" loop=1 />') +
+                          '<iframe id="layout" src="keyboard.html" />' +
+                        '</div>';
+  }
+
+  // Find the object used for playing the "beep" sound, if any.
+  if (typeof suppressAllAudio != 'undefined' && suppressAllAudio) {
+    this.beeper                = undefined;
+  } else {
+    this.beeper                = this.getChildById(this.container,
+                                                   'beep_embed');
+    if (!this.beeper || !this.beeper.Play) {
+      this.beeper              = this.getChildById(this.container,
+                                                   'beep_bgsound');
+      if (!this.beeper || typeof this.beeper.src == 'undefined') {
+        this.beeper            = undefined;
+      }
+    }
+  }
+
+  // Initialize the variables for finding the text console and the
+  // cursor.
+  this.reconnectBtn            = this.getChildById(this.container,'reconnect');
+  this.curSizeBox              = this.getChildById(this.container, 'cursize');
+  this.menu                    = this.getChildById(this.container, 'menu');
+  this.keyboard                = this.getChildById(this.container, 'keyboard');
+  this.keyboardImage           = this.getChildById(this.container, 'kbd_img');
+  this.layout                  = this.getChildById(this.container, 'layout');
+  this.scrollable              = this.getChildById(this.container,
+                                                                 'scrollable');
+  this.lineheight              = this.getChildById(this.container,
+                                                                 'lineheight');
+  this.console                 =
+                          [ this.getChildById(this.container, 'console'),
+                            this.getChildById(this.container, 'alt_console') ];
+  var ieProbe                  = this.getChildById(this.container, 'ieprobe');
+  this.padding                 = this.getChildById(this.container, 'padding');
+  this.cursor                  = this.getChildById(this.container, 'cursor');
+  this.usercss                 = this.getChildById(this.container, 'usercss');
+  this.space                   = this.getChildById(this.container, 'space');
+  this.input                   = this.getChildById(this.container, 'input');
+  this.cliphelper              = this.getChildById(this.container,
+                                                                 'cliphelper');
+
+  // Add any user selectable style sheets to the menu
+  this.initializeUserCSSStyles();
+
+  // Remember the dimensions of a standard character glyph. We would
+  // expect that we could just check cursor.clientWidth/Height at any time,
+  // but it turns out that browsers sometimes invalidate these values
+  // (e.g. while displaying a print preview screen).
+  this.cursorWidth             = this.cursor.clientWidth;
+  this.cursorHeight            = this.lineheight.clientHeight;
+
+  // IE has a slightly different boxing model, that we need to compensate for
+  this.isIE                    = ieProbe.offsetTop > 1;
+  ieProbe                      = undefined;
+  this.console.innerHTML       = '';
+
+  // Determine if the terminal window is positioned at the beginning of the
+  // page, or if it is embedded somewhere else in the page. For full-screen
+  // terminals, automatically resize whenever the browser window changes.
+  var marginTop                = parseInt(this.getCurrentComputedStyle(
+                                          document.body, 'marginTop'));
+  var marginLeft               = parseInt(this.getCurrentComputedStyle(
+                                          document.body, 'marginLeft'));
+  var marginRight              = parseInt(this.getCurrentComputedStyle(
+                                          document.body, 'marginRight'));
+  var x                        = this.container.offsetLeft;
+  var y                        = this.container.offsetTop;
+  for (var parent = this.container; parent = parent.offsetParent; ) {
+    x                         += parent.offsetLeft;
+    y                         += parent.offsetTop;
+  }
+  this.isEmbedded              = marginTop != y ||
+                                 marginLeft != x ||
+                                 (window.innerWidth ||
+                                  document.documentElement.clientWidth ||
+                                  document.body.clientWidth) -
+                                 marginRight != x + this.container.offsetWidth;
+  if (!this.isEmbedded) {
+    // Some browsers generate resize events when the terminal is first
+    // shown. Disable showing the size indicator until a little bit after
+    // the terminal has been rendered the first time.
+    this.indicateSize          = false;
+    setTimeout(function(vt100) {
+      return function() {
+        vt100.indicateSize     = true;
+      };
+    }(this), 100);
+    this.addListener(window, 'resize', 
+                     function(vt100) {
+                       return function() {
+                         vt100.hideContextMenu();
+                         vt100.resizer();
+                         vt100.showCurrentSize();
+                        }
+                      }(this));
+    
+    // Hide extra scrollbars attached to window
+    document.body.style.margin = '0px';
+    try { document.body.style.overflow ='hidden'; } catch (e) { }
+    try { document.body.oncontextmenu = function() {return false;};} catch(e){}
+  }
+
+  // Set up onscreen soft keyboard
+  this.initializeKeyboardButton();
+
+  // Hide context menu
+  this.hideContextMenu();
+
+  // Add listener to reconnect button
+  this.addListener(this.reconnectBtn.firstChild, 'click',
+                   function(vt100) {
+                     return function() {
+                       var rc = vt100.reconnect();
+                       vt100.input.focus();
+                       return rc;
+                     }
+                   }(this));
+
+  // Add input listeners
+  this.addListener(this.input, 'blur',
+                   function(vt100) {
+                     return function() { vt100.blurCursor(); } }(this));
+  this.addListener(this.input, 'focus',
+                   function(vt100) {
+                     return function() { vt100.focusCursor(); } }(this));
+  this.addListener(this.input, 'keydown',
+                   function(vt100) {
+                     return function(e) {
+                       if (!e) e = window.event;
+                       return vt100.keyDown(e); } }(this));
+  this.addListener(this.input, 'keypress',
+                   function(vt100) {
+                     return function(e) {
+                       if (!e) e = window.event;
+                       return vt100.keyPressed(e); } }(this));
+  this.addListener(this.input, 'keyup',
+                   function(vt100) {
+                     return function(e) {
+                       if (!e) e = window.event;
+                       return vt100.keyUp(e); } }(this));
+
+  // Attach listeners that move the focus to the <input> field. This way we
+  // can make sure that we can receive keyboard input.
+  var mouseEvent               = function(vt100, type) {
+    return function(e) {
+      if (!e) e = window.event;
+      return vt100.mouseEvent(e, type);
+    };
+  };
+  this.addListener(this.scrollable,'mousedown',mouseEvent(this, 0 /* MOUSE_DOWN */));
+  this.addListener(this.scrollable,'mouseup',  mouseEvent(this, 1 /* MOUSE_UP */));
+  this.addListener(this.scrollable,'click',    mouseEvent(this, 2 /* MOUSE_CLICK */));
+
+  // Check that browser supports drag and drop
+  if ('draggable' in document.createElement('span')) {
+      var dropEvent            = function (vt100) {
+          return function(e) {
+              if (!e) e = window.event;
+              if (e.preventDefault) e.preventDefault();
+              vt100.keysPressed(e.dataTransfer.getData('Text'));
+              return false;
+          };
+      };
+      // Tell the browser that we *can* drop on this target
+      this.addListener(this.scrollable, 'dragover', cancel);
+      this.addListener(this.scrollable, 'dragenter', cancel);
+
+      // Add a listener for the drop event
+      this.addListener(this.scrollable, 'drop', dropEvent(this));
+  }
+  
+  // Initialize the blank terminal window.
+  this.currentScreen           = 0;
+  this.cursorX                 = 0;
+  this.cursorY                 = 0;
+  this.numScrollbackLines      = 0;
+  this.top                     = 0;
+  this.bottom                  = 0x7FFFFFFF;
+  this.scale                   = 1.0;
+  this.resizer();
+  this.focusCursor();
+  this.input.focus();
+};
+
+function cancel(event) {
+  if (event.preventDefault) {
+    event.preventDefault();
+  }
+  return false;
+}
+
+VT100.prototype.getChildById = function(parent, id) {
+  var nodeList = parent.all || parent.getElementsByTagName('*');
+  if (typeof nodeList.namedItem == 'undefined') {
+    for (var i = 0; i < nodeList.length; i++) {
+      if (nodeList[i].id == id) {
+        return nodeList[i];
+      }
+    }
+    return null;
+  } else {
+    var elem = (parent.all || parent.getElementsByTagName('*')).namedItem(id);
+    return elem ? elem[0] || elem : null;
+  }
+};
+
+VT100.prototype.getCurrentComputedStyle = function(elem, style) {
+  if (typeof elem.currentStyle != 'undefined') {
+    return elem.currentStyle[style];
+  } else {
+    return document.defaultView.getComputedStyle(elem, null)[style];
+  }
+};
+
+VT100.prototype.reconnect = function() {
+  return false;
+};
+
+VT100.prototype.showReconnect = function(state) {
+  if (state) {
+    this.hideSoftKeyboard();
+    this.reconnectBtn.style.visibility = '';
+  } else {
+    this.reconnectBtn.style.visibility = 'hidden';
+  }
+};
+
+VT100.prototype.repairElements = function(console) {
+  for (var line = console.firstChild; line; line = line.nextSibling) {
+    if (!line.clientHeight) {
+      var newLine = document.createElement(line.tagName);
+      newLine.style.cssText       = line.style.cssText;
+      newLine.className           = line.className;
+      if (line.tagName == 'DIV') {
+        for (var span = line.firstChild; span; span = span.nextSibling) {
+          var newSpan             = document.createElement(span.tagName);
+          newSpan.style.cssText   = span.style.cssText;
+          newSpan.className	  = span.className;
+          this.setTextContent(newSpan, this.getTextContent(span));
+          newLine.appendChild(newSpan);
+        }
+      } else {
+        this.setTextContent(newLine, this.getTextContent(line));
+      }
+      line.parentNode.replaceChild(newLine, line);
+      line                        = newLine;
+    }
+  }
+};
+
+VT100.prototype.resized = function(w, h) {
+};
+
+VT100.prototype.resizer = function() {
+  // Hide onscreen soft keyboard
+  this.hideSoftKeyboard();
+
+  // The cursor can get corrupted if the print-preview is displayed in Firefox.
+  // Recreating it, will repair it.
+  var newCursor                = document.createElement('pre');
+  this.setTextContent(newCursor, ' ');
+  newCursor.id                 = 'cursor';
+  newCursor.style.cssText      = this.cursor.style.cssText;
+  this.cursor.parentNode.insertBefore(newCursor, this.cursor);
+  if (!newCursor.clientHeight) {
+    // Things are broken right now. This is probably because we are
+    // displaying the print-preview. Just don't change any of our settings
+    // until the print dialog is closed again.
+    newCursor.parentNode.removeChild(newCursor);
+    return;
+  } else {
+    // Swap the old broken cursor for the newly created one.
+    this.cursor.parentNode.removeChild(this.cursor);
+    this.cursor                = newCursor;
+  }
+
+  // Really horrible things happen if the contents of the terminal changes
+  // while the print-preview is showing. We get HTML elements that show up
+  // in the DOM, but that do not take up any space. Find these elements and
+  // try to fix them.
+  this.repairElements(this.console[0]);
+  this.repairElements(this.console[1]);
+
+  // Lock the cursor size to the size of a normal character. This helps with
+  // characters that are taller/shorter than normal. Unfortunately, we will
+  // still get confused if somebody enters a character that is wider/narrower
+  // than normal. This can happen if the browser tries to substitute a
+  // characters from a different font.
+  this.cursor.style.width      = this.cursorWidth  + 'px';
+  this.cursor.style.height     = this.cursorHeight + 'px';
+
+  // Adjust height for one pixel padding of the #vt100 element.
+  // The latter is necessary to properly display the inactive cursor.
+  var console                  = this.console[this.currentScreen];
+  var height                   = (this.isEmbedded ? this.container.clientHeight
+                                  : (window.innerHeight ||
+                                     document.documentElement.clientHeight ||
+                                     document.body.clientHeight))-1;
+  var partial                  = height % this.cursorHeight;
+  this.scrollable.style.height = (height > 0 ? height : 0) + 'px';
+  this.padding.style.height    = (partial > 0 ? partial : 0) + 'px';
+  var oldTerminalHeight        = this.terminalHeight;
+  this.updateWidth();
+  this.updateHeight();
+
+  // Clip the cursor to the visible screen.
+  var cx                       = this.cursorX;
+  var cy                       = this.cursorY + this.numScrollbackLines;
+
+  // The alternate screen never keeps a scroll back buffer.
+  this.updateNumScrollbackLines();
+  while (this.currentScreen && this.numScrollbackLines > 0) {
+    console.removeChild(console.firstChild);
+    this.numScrollbackLines--;
+  }
+  cy                          -= this.numScrollbackLines;
+  if (cx < 0) {
+    cx                         = 0;
+  } else if (cx > this.terminalWidth) {
+    cx                         = this.terminalWidth - 1;
+    if (cx < 0) {
+      cx                       = 0;
+    }
+  }
+  if (cy < 0) {
+    cy                         = 0;
+  } else if (cy > this.terminalHeight) {
+    cy                         = this.terminalHeight - 1;
+    if (cy < 0) {
+      cy                       = 0;
+    }
+  }
+
+  // Clip the scroll region to the visible screen.
+  if (this.bottom > this.terminalHeight ||
+      this.bottom == oldTerminalHeight) {
+    this.bottom                = this.terminalHeight;
+  }
+  if (this.top >= this.bottom) {
+    this.top                   = this.bottom-1;
+    if (this.top < 0) {
+      this.top                 = 0;
+    }
+  }
+
+  // Truncate lines, if necessary. Explicitly reposition cursor (this is
+  // particularly important after changing the screen number), and reset
+  // the scroll region to the default.
+  this.truncateLines(this.terminalWidth);
+  this.putString(cx, cy, '', undefined);
+  this.scrollable.scrollTop    = this.numScrollbackLines *
+                                 this.cursorHeight + 1;
+
+  // Update classNames for lines in the scrollback buffer
+  var line                     = console.firstChild;
+  for (var i = 0; i < this.numScrollbackLines; i++) {
+    line.className             = 'scrollback';
+    line                       = line.nextSibling;
+  }
+  while (line) {
+    line.className             = '';
+    line                       = line.nextSibling;
+  }
+
+  // Reposition the reconnect button
+  this.reconnectBtn.style.left = (this.terminalWidth*this.cursorWidth/
+                                  this.scale -
+                                  this.reconnectBtn.clientWidth)/2 + 'px';
+  this.reconnectBtn.style.top  = (this.terminalHeight*this.cursorHeight-
+                                  this.reconnectBtn.clientHeight)/2 + 'px';
+
+  // Send notification that the window size has been changed
+  this.resized(this.terminalWidth, this.terminalHeight);
+};
+
+VT100.prototype.showCurrentSize = function() {
+  if (!this.indicateSize) {
+    return;
+  }
+  this.curSizeBox.innerHTML             = '' + this.terminalWidth + 'x' +
+                                               this.terminalHeight;
+  this.curSizeBox.style.left            =
+                                      (this.terminalWidth*this.cursorWidth/
+                                       this.scale -
+                                       this.curSizeBox.clientWidth)/2 + 'px';
+  this.curSizeBox.style.top             =
+                                      (this.terminalHeight*this.cursorHeight -
+                                       this.curSizeBox.clientHeight)/2 + 'px';
+  this.curSizeBox.style.visibility      = '';
+  if (this.curSizeTimeout) {
+    clearTimeout(this.curSizeTimeout);
+  }
+
+  // Only show the terminal size for a short amount of time after resizing.
+  // Then hide this information, again. Some browsers generate resize events
+  // throughout the entire resize operation. This is nice, and we will show
+  // the terminal size while the user is dragging the window borders.
+  // Other browsers only generate a single event when the user releases the
+  // mouse. In those cases, we can only show the terminal size once at the
+  // end of the resize operation.
+  this.curSizeTimeout                   = setTimeout(function(vt100) {
+    return function() {
+      vt100.curSizeTimeout              = null;
+      vt100.curSizeBox.style.visibility = 'hidden';
+    };
+  }(this), 1000);
+};
+
+VT100.prototype.selection = function() {
+  try {
+    return '' + (window.getSelection && window.getSelection() ||
+                 document.selection && document.selection.type == 'Text' &&
+                 document.selection.createRange().text || '');
+  } catch (e) {
+  }
+  return '';
+};
+
+VT100.prototype.cancelEvent = function(event) {
+  try {
+    // For non-IE browsers
+    event.stopPropagation();
+    event.preventDefault();
+  } catch (e) {
+  }
+  try {
+    // For IE
+    event.cancelBubble = true;
+    event.returnValue  = false;
+    event.button       = 0;
+    event.keyCode      = 0;
+  } catch (e) {
+  }
+  return false;
+};
+
+VT100.prototype.mousePosition = function(event) {
+  var offsetX      = this.container.offsetLeft;
+  var offsetY      = this.container.offsetTop;
+  for (var e = this.container; e = e.offsetParent; ) {
+    offsetX       += e.offsetLeft;
+    offsetY       += e.offsetTop;
+  }
+  return [ event.clientX - offsetX,
+           event.clientY - offsetY ];
+};
+
+VT100.prototype.mouseEvent = function(event, type) {
+  // If any text is currently selected, do not move the focus as that would
+  // invalidate the selection.
+  var selection    = this.selection();
+  if ((type == 1 /* MOUSE_UP */ || type == 2 /* MOUSE_CLICK */) && !selection.length) {
+    this.input.focus();
+  }
+
+  // Compute mouse position in characters.
+  var position     = this.mousePosition(event);
+  var x            = Math.floor(position[0] / this.cursorWidth);
+  var y            = Math.floor((position[1] + this.scrollable.scrollTop) /
+                                this.cursorHeight) - this.numScrollbackLines;
+  var inside       = true;
+  if (x >= this.terminalWidth) {
+    x              = this.terminalWidth - 1;
+    inside         = false;
+  }
+  if (x < 0) {
+    x              = 0;
+    inside         = false;
+  }
+  if (y >= this.terminalHeight) {
+    y              = this.terminalHeight - 1;
+    inside         = false;
+  }
+  if (y < 0) {
+    y              = 0;
+    inside         = false;
+  }
+
+  // Compute button number and modifier keys.
+  var button       = type != 0 /* MOUSE_DOWN */ ? 3 :
+                     typeof event.pageX != 'undefined' ? event.button :
+                     [ undefined, 0, 2, 0, 1, 0, 1, 0  ][event.button];
+  if (button != undefined) {
+    if (event.shiftKey) {
+      button      |= 0x04;
+    }
+    if (event.altKey || event.metaKey) {
+      button      |= 0x08;
+    }
+    if (event.ctrlKey) {
+      button      |= 0x10;
+    }
+  }
+
+  // Report mouse events if they happen inside of the current screen and
+  // with the SHIFT key unpressed. Both of these restrictions do not apply
+  // for button releases, as we always want to report those.
+  if (this.mouseReporting && !selection.length &&
+      (type != 0 /* MOUSE_DOWN */ || !event.shiftKey)) {
+    if (inside || type != 0 /* MOUSE_DOWN */) {
+      if (button != undefined) {
+        var report = '\u001B[M' + String.fromCharCode(button + 32) +
+                                  String.fromCharCode(x      + 33) +
+                                  String.fromCharCode(y      + 33);
+        if (type != 2 /* MOUSE_CLICK */) {
+          this.keysPressed(report);
+        }
+
+        // If we reported the event, stop propagating it (not sure, if this
+        // actually works on most browsers; blocking the global "oncontextmenu"
+        // even is still necessary).
+        return this.cancelEvent(event);
+      }
+    }
+  }
+
+  // Bring up context menu.
+  if (button == 2 && !event.shiftKey) {
+    if (type == 0 /* MOUSE_DOWN */) {
+      this.showContextMenu(position[0], position[1]);
+    }
+    return this.cancelEvent(event);
+  }
+
+  if (this.mouseReporting) {
+    try {
+      event.shiftKey         = false;
+    } catch (e) {
+    }
+  }
+
+  return true;
+};
+
+VT100.prototype.replaceChar = function(s, ch, repl) {
+  for (var i = -1;;) {
+    i = s.indexOf(ch, i + 1);
+    if (i < 0) {
+      break;
+    }
+    s = s.substr(0, i) + repl + s.substr(i + 1);
+  }
+  return s;
+};
+
+VT100.prototype.htmlEscape = function(s) {
+  return this.replaceChar(this.replaceChar(this.replaceChar(this.replaceChar(
+                s, '&', '&'), '<', '<'), '"', '"'), ' ', '\u00A0');
+};
+
+VT100.prototype.getTextContent = function(elem) {
+  return elem.textContent ||
+         (typeof elem.textContent == 'undefined' ? elem.innerText : '');
+};
+
+VT100.prototype.setTextContentRaw = function(elem, s) {
+  // Updating the content of an element is an expensive operation. It actually
+  // pays off to first check whether the element is still unchanged.
+  if (typeof elem.textContent == 'undefined') {
+    if (elem.innerText != s) {
+      try {
+        elem.innerText = s;
+      } catch (e) {
+        // Very old versions of IE do not allow setting innerText. Instead,
+        // remove all children, by setting innerHTML and then set the text
+        // using DOM methods.
+        elem.innerHTML = '';
+        elem.appendChild(document.createTextNode(
+                                          this.replaceChar(s, ' ', '\u00A0')));
+      }
+    }
+  } else {
+    if (elem.textContent != s) {
+      elem.textContent = s;
+    }
+  }
+};
+
+VT100.prototype.setTextContent = function(elem, s) {
+  // Check if we find any URLs in the text. If so, automatically convert them
+  // to links.
+  if (this.urlRE && this.urlRE.test(s)) {
+    var inner          = '';
+    for (;;) {
+      var consumed = 0;
+      if (RegExp.leftContext != null) {
+        inner         += this.htmlEscape(RegExp.leftContext);
+        consumed      += RegExp.leftContext.length;
+      }
+      var url          = this.htmlEscape(RegExp.lastMatch);
+      var fullUrl      = url;
+
+      // If no protocol was specified, try to guess a reasonable one.
+      if (url.indexOf('http://') < 0 && url.indexOf('https://') < 0 &&
+          url.indexOf('ftp://')  < 0 && url.indexOf('mailto:')  < 0) {
+        var slash      = url.indexOf('/');
+        var at         = url.indexOf('@');
+        var question   = url.indexOf('?');
+        if (at > 0 &&
+            (at < question || question < 0) &&
+            (slash < 0 || (question > 0 && slash > question))) {
+          fullUrl      = 'mailto:' + url;
+        } else {
+          fullUrl      = (url.indexOf('ftp.') == 0 ? 'ftp://' : 'http://') +
+                          url;
+        }
+      }
+
+      inner           += '<a target="vt100Link" href="' + fullUrl +
+                         '">' + url + '</a>';
+      consumed        += RegExp.lastMatch.length;
+      s                = s.substr(consumed);
+      if (!this.urlRE.test(s)) {
+        if (RegExp.rightContext != null) {
+          inner       += this.htmlEscape(RegExp.rightContext);
+        }
+        break;
+      }
+    }
+    elem.innerHTML     = inner;
+    return;
+  }
+
+  this.setTextContentRaw(elem, s);
+};
+
+VT100.prototype.insertBlankLine = function(y, color, style) {
+  // Insert a blank line a position y. This method ignores the scrollback
+  // buffer. The caller has to add the length of the scrollback buffer to
+  // the position, if necessary.
+  // If the position is larger than the number of current lines, this
+  // method just adds a new line right after the last existing one. It does
+  // not add any missing lines in between. It is the caller's responsibility
+  // to do so.
+  if (!color) {
+    color                = 'ansi0 bgAnsi15';
+  }
+  if (!style) {
+    style                = '';
+  }
+  var line;
+  if (color != 'ansi0 bgAnsi15' && !style) {
+    line                 = document.createElement('pre');
+    this.setTextContent(line, '\n');
+  } else {
+    line                 = document.createElement('div');
+    var span             = document.createElement('span');
+    span.style.cssText   = style;
+    span.className	 = color;
+    this.setTextContent(span, this.spaces(this.terminalWidth));
+    line.appendChild(span);
+  }
+  line.style.height      = this.cursorHeight + 'px';
+  var console            = this.console[this.currentScreen];
+  if (console.childNodes.length > y) {
+    console.insertBefore(line, console.childNodes[y]);
+  } else {
+    console.appendChild(line);
+  }
+};
+
+VT100.prototype.updateWidth = function() {
+  this.terminalWidth = Math.floor(this.console[this.currentScreen].offsetWidth/
+                                  this.cursorWidth*this.scale);
+  return this.terminalWidth;
+};
+
+VT100.prototype.updateHeight = function() {
+  // We want to be able to display either a terminal window that fills the
+  // entire browser window, or a terminal window that is contained in a
+  // <div> which is embededded somewhere in the web page.
+  if (this.isEmbedded) {
+    // Embedded terminal. Use size of the containing <div> (id="vt100").
+    this.terminalHeight = Math.floor((this.container.clientHeight-1) /
+                                     this.cursorHeight);
+  } else {
+    // Use the full browser window.
+    this.terminalHeight = Math.floor(((window.innerHeight ||
+                                       document.documentElement.clientHeight ||
+                                       document.body.clientHeight)-1)/
+                                     this.cursorHeight);
+  }
+  return this.terminalHeight;
+};
+
+VT100.prototype.updateNumScrollbackLines = function() {
+  var scrollback          = Math.floor(
+                                this.console[this.currentScreen].offsetHeight /
+                                this.cursorHeight) -
+                            this.terminalHeight;
+  this.numScrollbackLines = scrollback < 0 ? 0 : scrollback;
+  return this.numScrollbackLines;
+};
+
+VT100.prototype.truncateLines = function(width) {
+  if (width < 0) {
+    width             = 0;
+  }
+  for (var line = this.console[this.currentScreen].firstChild; line;
+       line = line.nextSibling) {
+    if (line.tagName == 'DIV') {
+      var x           = 0;
+
+      // Traverse current line and truncate it once we saw "width" characters
+      for (var span = line.firstChild; span;
+           span = span.nextSibling) {
+        var s         = this.getTextContent(span);
+        var l         = s.length;
+        if (x + l > width) {
+          this.setTextContent(span, s.substr(0, width - x));
+          while (span.nextSibling) {
+            line.removeChild(line.lastChild);
+          }
+          break;
+        }
+        x            += l;
+      }
+      // Prune white space from the end of the current line
+      var span       = line.lastChild;
+      while (span &&
+             span.className == 'ansi0 bgAnsi15' &&
+             !span.style.cssText.length) {
+        // Scan backwards looking for first non-space character
+        var s         = this.getTextContent(span);
+        for (var i = s.length; i--; ) {
+          if (s.charAt(i) != ' ' && s.charAt(i) != '\u00A0') {
+            if (i+1 != s.length) {
+              this.setTextContent(s.substr(0, i+1));
+            }
+            span      = null;
+            break;
+          }
+        }
+        if (span) {
+          var sibling = span;
+          span        = span.previousSibling;
+          if (span) {
+            // Remove blank <span>'s from end of line
+            line.removeChild(sibling);
+          } else {
+            // Remove entire line (i.e. <div>), if empty
+            var blank = document.createElement('pre');
+            blank.style.height = this.cursorHeight + 'px';
+            this.setTextContent(blank, '\n');
+            line.parentNode.replaceChild(blank, line);
+          }
+        }
+      }
+    }
+  }
+};
+
+VT100.prototype.putString = function(x, y, text, color, style) {
+  if (!color) {
+    color                           = 'ansi0 bgAnsi15';
+  }
+  if (!style) {
+    style                           = '';
+  }
+  var yIdx                          = y + this.numScrollbackLines;
+  var line;
+  var sibling;
+  var s;
+  var span;
+  var xPos                          = 0;
+  var console                       = this.console[this.currentScreen];
+  if (!text.length && (yIdx >= console.childNodes.length ||
+                       console.childNodes[yIdx].tagName != 'DIV')) {
+    // Positioning cursor to a blank location
+    span                            = null;
+  } else {
+    // Create missing blank lines at end of page
+    while (console.childNodes.length <= yIdx) {
+      // In order to simplify lookups, we want to make sure that each line
+      // is represented by exactly one element (and possibly a whole bunch of
+      // children).
+      // For non-blank lines, we can create a <div> containing one or more
+      // <span>s. For blank lines, this fails as browsers tend to optimize them
+      // away. But fortunately, a <pre> tag containing a newline character
+      // appears to work for all browsers (a   would also work, but then
+      // copying from the browser window would insert superfluous spaces into
+      // the clipboard).
+      this.insertBlankLine(yIdx);
+    }
+    line                            = console.childNodes[yIdx];
+    
+    // If necessary, promote blank '\n' line to a <div> tag
+    if (line.tagName != 'DIV') {
+      var div                       = document.createElement('div');
+      div.style.height              = this.cursorHeight + 'px';
+      div.innerHTML                 = '<span></span>';
+      console.replaceChild(div, line);
+      line                          = div;
+    }
+
+    // Scan through list of <span>'s until we find the one where our text
+    // starts
+    span                            = line.firstChild;
+    var len;
+    while (span.nextSibling && xPos < x) {
+      len                           = this.getTextContent(span).length;
+      if (xPos + len > x) {
+        break;
+      }
+      xPos                         += len;
+      span                          = span.nextSibling;
+    }
+
+    if (text.length) {
+      // If current <span> is not long enough, pad with spaces or add new
+      // span
+      s                             = this.getTextContent(span);
+      var oldColor                  = span.className;
+      var oldStyle                  = span.style.cssText;
+      if (xPos + s.length < x) {
+        if (oldColor != 'ansi0 bgAnsi15' || oldStyle != '') {
+          span                      = document.createElement('span');
+          line.appendChild(span);
+          span.className            = 'ansi0 bgAnsi15';
+          span.style.cssText        = '';
+          oldColor                  = 'ansi0 bgAnsi15';
+          oldStyle                  = '';
+          xPos                     += s.length;
+          s                         = '';
+        }
+        do {
+          s                        += ' ';
+        } while (xPos + s.length < x);
+      }
+    
+      // If styles do not match, create a new <span>
+      var del                       = text.length - s.length + x - xPos;
+      if (oldColor != color ||
+          (oldStyle != style && (oldStyle || style))) {
+        if (xPos == x) {
+          // Replacing text at beginning of existing <span>
+          if (text.length >= s.length) {
+            // New text is equal or longer than existing text
+            s                       = text;
+          } else {
+            // Insert new <span> before the current one, then remove leading
+            // part of existing <span>, adjust style of new <span>, and finally
+            // set its contents
+            sibling                 = document.createElement('span');
+            line.insertBefore(sibling, span);
+            this.setTextContent(span, s.substr(text.length));
+            span                    = sibling;
+            s                       = text;
+          }
+        } else {
+          // Replacing text some way into the existing <span>
+          var remainder             = s.substr(x + text.length - xPos);
+          this.setTextContent(span, s.substr(0, x - xPos));
+          xPos                      = x;
+          sibling                   = document.createElement('span');
+          if (span.nextSibling) {
+            line.insertBefore(sibling, span.nextSibling);
+            span                    = sibling;
+            if (remainder.length) {
+              sibling               = document.createElement('span');
+              sibling.className     = oldColor;
+              sibling.style.cssText = oldStyle;
+              this.setTextContent(sibling, remainder);
+              line.insertBefore(sibling, span.nextSibling);
+            }
+          } else {
+            line.appendChild(sibling);
+            span                    = sibling;
+            if (remainder.length) {
+              sibling               = document.createElement('span');
+              sibling.className     = oldColor;
+              sibling.style.cssText = oldStyle;
+              this.setTextContent(sibling, remainder);
+              line.appendChild(sibling);
+            }
+          }
+          s                         = text;
+        }
+        span.className              = color;
+        span.style.cssText          = style;
+      } else {
+        // Overwrite (partial) <span> with new text
+        s                           = s.substr(0, x - xPos) +
+          text +
+          s.substr(x + text.length - xPos);
+      }
+      this.setTextContent(span, s);
+
+      
+      // Delete all subsequent <span>'s that have just been overwritten
+      sibling                       = span.nextSibling;
+      while (del > 0 && sibling) {
+        s                           = this.getTextContent(sibling);
+        len                         = s.length;
+        if (len <= del) {
+          line.removeChild(sibling);
+          del                      -= len;
+          sibling                   = span.nextSibling;
+        } else {
+          this.setTextContent(sibling, s.substr(del));
+          break;
+        }
+      }
+      
+      // Merge <span> with next sibling, if styles are identical
+      if (sibling && span.className == sibling.className &&
+          span.style.cssText == sibling.style.cssText) {
+        this.setTextContent(span,
+                            this.getTextContent(span) +
+                            this.getTextContent(sibling));
+        line.removeChild(sibling);
+      }
+    }
+  }
+
+  // Position cursor
+  this.cursorX                      = x + text.length;
+  if (this.cursorX >= this.terminalWidth) {
+    this.cursorX                    = this.terminalWidth - 1;
+    if (this.cursorX < 0) {
+      this.cursorX                  = 0;
+    }
+  }
+  var pixelX                        = -1;
+  var pixelY                        = -1;
+  if (!this.cursor.style.visibility) {
+    var idx                         = this.cursorX - xPos;
+    if (span) {
+      // If we are in a non-empty line, take the cursor Y position from the
+      // other elements in this line. If dealing with broken, non-proportional
+      // fonts, this is likely to yield better results.
+      pixelY                        = span.offsetTop +
+                                      span.offsetParent.offsetTop;
+      s                             = this.getTextContent(span);
+      var nxtIdx                    = idx - s.length;
+      if (nxtIdx < 0) {
+        this.setTextContent(this.cursor, s.charAt(idx));
+        pixelX                      = span.offsetLeft +
+                                      idx*span.offsetWidth / s.length;
+      } else {
+        if (nxtIdx == 0) {
+          pixelX                    = span.offsetLeft + span.offsetWidth;
+        }
+        if (span.nextSibling) {
+          s                         = this.getTextContent(span.nextSibling);
+          this.setTextContent(this.cursor, s.charAt(nxtIdx));
+          if (pixelX < 0) {
+            pixelX                  = span.nextSibling.offsetLeft +
+                                      nxtIdx*span.offsetWidth / s.length;
+          }
+        } else {
+          this.setTextContent(this.cursor, ' ');
+        }
+      }
+    } else {
+      this.setTextContent(this.cursor, ' ');
+    }
+  }
+  if (pixelX >= 0) {
+    this.cursor.style.left          = (pixelX + (this.isIE ? 1 : 0))/
+                                      this.scale + 'px';
+  } else {
+    this.setTextContent(this.space, this.spaces(this.cursorX));
+    this.cursor.style.left          = (this.space.offsetWidth +
+                                       console.offsetLeft)/this.scale + 'px';
+  }
+  this.cursorY                      = yIdx - this.numScrollbackLines;
+  if (pixelY >= 0) {
+    this.cursor.style.top           = pixelY + 'px';
+  } else {
+    this.cursor.style.top           = yIdx*this.cursorHeight +
+                                      console.offsetTop + 'px';
+  }
+
+  if (text.length) {
+    // Merge <span> with previous sibling, if styles are identical
+    if ((sibling = span.previousSibling) &&
+        span.className == sibling.className &&
+        span.style.cssText == sibling.style.cssText) {
+      this.setTextContent(span,
+                          this.getTextContent(sibling) +
+                          this.getTextContent(span));
+      line.removeChild(sibling);
+    }
+    
+    // Prune white space from the end of the current line
+    span                            = line.lastChild;
+    while (span &&
+           span.className == 'ansi0 bgAnsi15' &&
+           !span.style.cssText.length) {
+      // Scan backwards looking for first non-space character
+      s                             = this.getTextContent(span);
+      for (var i = s.length; i--; ) {
+        if (s.charAt(i) != ' ' && s.charAt(i) != '\u00A0') {
+          if (i+1 != s.length) {
+            this.setTextContent(s.substr(0, i+1));
+          }
+          span                      = null;
+          break;
+        }
+      }
+      if (span) {
+        sibling                     = span;
+        span                        = span.previousSibling;
+        if (span) {
+          // Remove blank <span>'s from end of line
+          line.removeChild(sibling);
+        } else {
+          // Remove entire line (i.e. <div>), if empty
+          var blank                 = document.createElement('pre');
+          blank.style.height        = this.cursorHeight + 'px';
+          this.setTextContent(blank, '\n');
+          line.parentNode.replaceChild(blank, line);
+        }
+      }
+    }
+  }
+};
+
+VT100.prototype.gotoXY = function(x, y) {
+  if (x >= this.terminalWidth) {
+    x           = this.terminalWidth - 1;
+  }
+  if (x < 0) {
+    x           = 0;
+  }
+  var minY, maxY;
+  if (this.offsetMode) {
+    minY        = this.top;
+    maxY        = this.bottom;
+  } else {
+    minY        = 0;
+    maxY        = this.terminalHeight;
+  }
+  if (y >= maxY) {
+    y           = maxY - 1;
+  }
+  if (y < minY) {
+    y           = minY;
+  }
+  this.putString(x, y, '', undefined);
+  this.needWrap = false;
+};
+
+VT100.prototype.gotoXaY = function(x, y) {
+  this.gotoXY(x, this.offsetMode ? (this.top + y) : y);
+};
+
+VT100.prototype.refreshInvertedState = function() {
+  if (this.isInverted) {
+    this.scrollable.className += ' inverted';
+  } else {
+    this.scrollable.className = this.scrollable.className.
+                                                     replace(/ *inverted/, '');
+  }
+};
+
+VT100.prototype.enableAlternateScreen = function(state) {
+  // Don't do anything, if we are already on the desired screen
+  if ((state ? 1 : 0) == this.currentScreen) {
+    // Calling the resizer is not actually necessary. But it is a good way
+    // of resetting state that might have gotten corrupted.
+    this.resizer();
+    return;
+  }
+  
+  // We save the full state of the normal screen, when we switch away from it.
+  // But for the alternate screen, no saving is necessary. We always reset
+  // it when we switch to it.
+  if (state) {
+    this.saveCursor();
+  }
+
+  // Display new screen, and initialize state (the resizer does that for us).
+  this.currentScreen                                 = state ? 1 : 0;
+  this.console[1-this.currentScreen].style.display   = 'none';
+  this.console[this.currentScreen].style.display     = '';
+
+  // Select appropriate character pitch.
+  var transform                                      = this.getTransformName();
+  if (transform) {
+    if (state) {
+      // Upon enabling the alternate screen, we switch to 80 column mode. But
+      // upon returning to the regular screen, we restore the mode that was
+      // in effect previously.
+      this.console[1].style[transform]               = '';
+    }
+    var style                                        =
+                             this.console[this.currentScreen].style[transform];
+    this.cursor.style[transform]                     = style;
+    this.space.style[transform]                      = style;
+    this.scale                                       = style == '' ? 1.0:1.65;
+    if (transform == 'filter') {
+       this.console[this.currentScreen].style.width  = style == '' ? '165%':'';
+    }
+  }
+  this.resizer();
+
+  // If we switched to the alternate screen, reset it completely. Otherwise,
+  // restore the saved state.
+  if (state) {
+    this.gotoXY(0, 0);
+    this.clearRegion(0, 0, this.terminalWidth, this.terminalHeight);
+  } else {
+    this.restoreCursor();
+  }
+};
+
+VT100.prototype.hideCursor = function() {
+  var hidden = this.cursor.style.visibility == 'hidden';
+  if (!hidden) {
+    this.cursor.style.visibility = 'hidden';
+    return true;
+  }
+  return false;
+};
+
+VT100.prototype.showCursor = function(x, y) {
+  if (this.cursor.style.visibility) {
+    this.cursor.style.visibility = '';
+    this.putString(x == undefined ? this.cursorX : x,
+                   y == undefined ? this.cursorY : y,
+                   '', undefined);
+    return true;
+  }
+  return false;
+};
+
+VT100.prototype.scrollBack = function() {
+  var i                     = this.scrollable.scrollTop -
+                              this.scrollable.clientHeight;
+  this.scrollable.scrollTop = i < 0 ? 0 : i;
+};
+
+VT100.prototype.scrollFore = function() {
+  var i                     = this.scrollable.scrollTop +
+                              this.scrollable.clientHeight;
+  this.scrollable.scrollTop = i > this.numScrollbackLines *
+                                  this.cursorHeight + 1
+                              ? this.numScrollbackLines *
+                                this.cursorHeight + 1
+                              : i;
+};
+
+VT100.prototype.spaces = function(i) {
+  var s = '';
+  while (i-- > 0) {
+    s += ' ';
+  }
+  return s;
+};
+
+VT100.prototype.clearRegion = function(x, y, w, h, color, style) {
+  w         += x;
+  if (x < 0) {
+    x        = 0;
+  }
+  if (w > this.terminalWidth) {
+    w        = this.terminalWidth;
+  }
+  if ((w    -= x) <= 0) {
+    return;
+  }
+  h         += y;
+  if (y < 0) {
+    y        = 0;
+  }
+  if (h > this.terminalHeight) {
+    h        = this.terminalHeight;
+  }
+  if ((h    -= y) <= 0) {
+    return;
+  }
+
+  // Special case the situation where we clear the entire screen, and we do
+  // not have a scrollback buffer. In that case, we should just remove all
+  // child nodes.
+  if (!this.numScrollbackLines &&
+      w == this.terminalWidth && h == this.terminalHeight &&
+      (color == undefined || color == 'ansi0 bgAnsi15') && !style) {
+    var console = this.console[this.currentScreen];
+    while (console.lastChild) {
+      console.removeChild(console.lastChild);
+    }
+    this.putString(this.cursorX, this.cursorY, '', undefined);
+  } else {
+    var hidden = this.hideCursor();
+    var cx     = this.cursorX;
+    var cy     = this.cursorY;
+    var s      = this.spaces(w);
+    for (var i = y+h; i-- > y; ) {
+      this.putString(x, i, s, color, style);
+    }
+    hidden ? this.showCursor(cx, cy) : this.putString(cx, cy, '', undefined);
+  }
+};
+
+VT100.prototype.copyLineSegment = function(dX, dY, sX, sY, w) {
+  var text                            = [ ];
+  var className                       = [ ];
+  var style                           = [ ];
+  var console                         = this.console[this.currentScreen];
+  if (sY >= console.childNodes.length) {
+    text[0]                           = this.spaces(w);
+    className[0]                      = undefined;
+    style[0]                          = undefined;
+  } else {
+    var line = console.childNodes[sY];
+    if (line.tagName != 'DIV' || !line.childNodes.length) {
+      text[0]                         = this.spaces(w);
+      className[0]                    = undefined;
+      style[0]                        = undefined;
+    } else {
+      var x                           = 0;
+      for (var span = line.firstChild; span && w > 0; span = span.nextSibling){
+        var s                         = this.getTextContent(span);
+        var len                       = s.length;
+        if (x + len > sX) {
+          var o                       = sX > x ? sX - x : 0;
+          text[text.length]           = s.substr(o, w);
+          className[className.length] = span.className;
+          style[style.length]         = span.style.cssText;
+          w                          -= len - o;
+        }
+        x                            += len;
+      }
+      if (w > 0) {
+        text[text.length]             = this.spaces(w);
+        className[className.length]   = undefined;
+        style[style.length]           = undefined;
+      }
+    }
+  }
+  var hidden                          = this.hideCursor();
+  var cx                              = this.cursorX;
+  var cy                              = this.cursorY;
+  for (var i = 0; i < text.length; i++) {
+    var color;
+    if (className[i]) {
+      color                           = className[i];
+    } else {
+      color                           = 'ansi0 bgAnsi15';
+    }
+    this.putString(dX, dY - this.numScrollbackLines, text[i], color, style[i]);
+    dX                               += text[i].length;
+  }
+  hidden ? this.showCursor(cx, cy) : this.putString(cx, cy, '', undefined);
+};
+
+VT100.prototype.scrollRegion = function(x, y, w, h, incX, incY,
+                                        color, style) {
+  var left             = incX < 0 ? -incX : 0;
+  var right            = incX > 0 ?  incX : 0;
+  var up               = incY < 0 ? -incY : 0;
+  var down             = incY > 0 ?  incY : 0;
+
+  // Clip region against terminal size
+  var dontScroll       = null;
+  w                   += x;
+  if (x < left) {
+    x                  = left;
+  }
+  if (w > this.terminalWidth - right) {
+    w                  = this.terminalWidth - right;
+  }
+  if ((w              -= x) <= 0) {
+    dontScroll         = 1;
+  }
+  h                   += y;
+  if (y < up) {
+    y                  = up;
+  }
+  if (h > this.terminalHeight - down) {
+    h                  = this.terminalHeight - down;
+  }
+  if ((h              -= y) < 0) {
+    dontScroll         = 1;
+  }
+  if (!dontScroll) {
+    if (style && style.indexOf('underline')) {
+      // Different terminal emulators disagree on the attributes that
+      // are used for scrolling. The consensus seems to be, never to
+      // fill with underlined spaces. N.B. this is different from the
+      // cases when the user blanks a region. User-initiated blanking
+      // always fills with all of the current attributes.
+      style            = style.replace(/text-decoration:underline;/, '');
+    }
+
+    // Compute current scroll position
+    var scrollPos      = this.numScrollbackLines -
+                      (this.scrollable.scrollTop-1) / this.cursorHeight;
+
+    // Determine original cursor position. Hide cursor temporarily to avoid
+    // visual artifacts.
+    var hidden         = this.hideCursor();
+    var cx             = this.cursorX;
+    var cy             = this.cursorY;
+    var console        = this.console[this.currentScreen];
+
+    if (!incX && !x && w == this.terminalWidth) {
+      // Scrolling entire lines
+      if (incY < 0) {
+        // Scrolling up
+        if (!this.currentScreen && y == -incY &&
+            h == this.terminalHeight + incY) {
+          // Scrolling up with adding to the scrollback buffer. This is only
+          // possible if there are at least as many lines in the console,
+          // as the terminal is high
+          while (console.childNodes.length < this.terminalHeight) {
+            this.insertBlankLine(this.terminalHeight);
+          }
+          
+          // Add new lines at bottom in order to force scrolling
+          for (var i = 0; i < y; i++) {
+            this.insertBlankLine(console.childNodes.length, color, style);
+          }
+
+          // Adjust the number of lines in the scrollback buffer by
+          // removing excess entries.
+          this.updateNumScrollbackLines();
+          while (this.numScrollbackLines >
+                 (this.currentScreen ? 0 : this.maxScrollbackLines)) {
+            console.removeChild(console.firstChild);
+            this.numScrollbackLines--;
+          }
+
+          // Mark lines in the scrollback buffer, so that they do not get
+          // printed.
+          for (var i = this.numScrollbackLines, j = -incY;
+               i-- > 0 && j-- > 0; ) {
+            console.childNodes[i].className = 'scrollback';
+          }
+        } else {
+          // Scrolling up without adding to the scrollback buffer.
+          for (var i = -incY;
+               i-- > 0 &&
+               console.childNodes.length >
+               this.numScrollbackLines + y + incY; ) {
+            console.removeChild(console.childNodes[
+                                          this.numScrollbackLines + y + incY]);
+          }
+
+          // If we used to have a scrollback buffer, then we must make sure
+          // that we add back blank lines at the bottom of the terminal.
+          // Similarly, if we are scrolling in the middle of the screen,
+          // we must add blank lines to ensure that the bottom of the screen
+          // does not move up.
+          if (this.numScrollbackLines > 0 ||
+              console.childNodes.length > this.numScrollbackLines+y+h+incY) {
+            for (var i = -incY; i-- > 0; ) {
+              this.insertBlankLine(this.numScrollbackLines + y + h + incY,
+                                   color, style);
+            }
+          }
+        }
+      } else {
+        // Scrolling down
+        for (var i = incY;
+             i-- > 0 &&
+             console.childNodes.length > this.numScrollbackLines + y + h; ) {
+          console.removeChild(console.childNodes[this.numScrollbackLines+y+h]);
+        }
+        for (var i = incY; i--; ) {
+          this.insertBlankLine(this.numScrollbackLines + y, color, style);
+        }
+      }
+    } else {
+      // Scrolling partial lines
+      if (incY <= 0) {
+        // Scrolling up or horizontally within a line
+        for (var i = y + this.numScrollbackLines;
+             i < y + this.numScrollbackLines + h;
+             i++) {
+          this.copyLineSegment(x + incX, i + incY, x, i, w);
+        }
+      } else {
+        // Scrolling down
+        for (var i = y + this.numScrollbackLines + h;
+             i-- > y + this.numScrollbackLines; ) {
+          this.copyLineSegment(x + incX, i + incY, x, i, w);
+        }
+      }
+
+      // Clear blank regions
+      if (incX > 0) {
+        this.clearRegion(x, y, incX, h, color, style);
+      } else if (incX < 0) {
+        this.clearRegion(x + w + incX, y, -incX, h, color, style);
+      }
+      if (incY > 0) {
+        this.clearRegion(x, y, w, incY, color, style);
+      } else if (incY < 0) {
+        this.clearRegion(x, y + h + incY, w, -incY, color, style);
+      }
+    }
+
+    // Reset scroll position
+    this.scrollable.scrollTop = (this.numScrollbackLines-scrollPos) *
+                                this.cursorHeight + 1;
+
+    // Move cursor back to its original position
+    hidden ? this.showCursor(cx, cy) : this.putString(cx, cy, '', undefined);
+  }
+};
+
+VT100.prototype.copy = function(selection) {
+  if (selection == undefined) {
+    selection                = this.selection();
+  }
+  this.internalClipboard     = undefined;
+  if (selection.length) {
+    try {
+      // IE
+      this.cliphelper.value  = selection;
+      this.cliphelper.select();
+      this.cliphelper.createTextRange().execCommand('copy');
+    } catch (e) {
+      this.internalClipboard = selection;
+    }
+    this.cliphelper.value    = '';
+  }
+};
+
+VT100.prototype.copyLast = function() {
+  // Opening the context menu can remove the selection. We try to prevent this
+  // from happening, but that is not possible for all browsers. So, instead,
+  // we compute the selection before showing the menu.
+  this.copy(this.lastSelection);
+};
+
+VT100.prototype.pasteFnc = function() {
+  var clipboard     = undefined;
+  if (this.internalClipboard != undefined) {
+    clipboard       = this.internalClipboard;
+  } else {
+    try {
+      this.cliphelper.value = '';
+      this.cliphelper.createTextRange().execCommand('paste');
+      clipboard     = this.cliphelper.value;
+    } catch (e) {
+    }
+  }
+  this.cliphelper.value = '';
+  if (clipboard && this.menu.style.visibility == 'hidden') {
+    return function() {
+      this.keysPressed('' + clipboard);
+    };
+  } else {
+    return undefined;
+  }
+};
+
+VT100.prototype.pasteBrowserFnc = function() {
+  var clipboard     = prompt("Paste into this box:","");
+  if (clipboard != undefined) {
+     return this.keysPressed('' + clipboard);
+  }
+};
+
+VT100.prototype.toggleUTF = function() {
+  this.utfEnabled   = !this.utfEnabled;
+
+  // We always persist the last value that the user selected. Not necessarily
+  // the last value that a random program requested.
+  this.utfPreferred = this.utfEnabled;
+};
+
+VT100.prototype.toggleBell = function() {
+  this.visualBell = !this.visualBell;
+};
+
+VT100.prototype.toggleSoftKeyboard = function() {
+  this.softKeyboard = !this.softKeyboard;
+  this.keyboardImage.style.visibility = this.softKeyboard ? 'visible' : '';
+};
+
+VT100.prototype.deselectKeys = function(elem) {
+  if (elem && elem.className == 'selected') {
+    elem.className = '';
+  }
+  for (elem = elem.firstChild; elem; elem = elem.nextSibling) {
+    this.deselectKeys(elem);
+  }
+};
+
+VT100.prototype.showSoftKeyboard = function() {
+  // Make sure no key is currently selected
+  this.lastSelectedKey           = undefined;
+  this.deselectKeys(this.keyboard);
+  this.isShift                   = false;
+  this.showShiftState(false);
+  this.isCtrl                    = false;
+  this.showCtrlState(false);
+  this.isAlt                     = false;
+  this.showAltState(false);
+
+  this.keyboard.style.left       = '0px';
+  this.keyboard.style.top        = '0px';
+  this.keyboard.style.width      = this.container.offsetWidth  + 'px';
+  this.keyboard.style.height     = this.container.offsetHeight + 'px';
+  this.keyboard.style.visibility = 'hidden';
+  this.keyboard.style.display    = '';
+
+  var kbd                        = this.keyboard.firstChild;
+  var scale                      = 1.0;
+  var transform                  = this.getTransformName();
+  if (transform) {
+    kbd.style[transform]         = '';
+    if (kbd.offsetWidth > 0.9 * this.container.offsetWidth) {
+      scale                      = (kbd.offsetWidth/
+                                    this.container.offsetWidth)/0.9;
+    }
+    if (kbd.offsetHeight > 0.9 * this.container.offsetHeight) {
+      scale                      = Math.max((kbd.offsetHeight/
+                                             this.container.offsetHeight)/0.9);
+    }
+    var style                    = this.getTransformStyle(transform,
+                                              scale > 1.0 ? scale : undefined);
+    kbd.style[transform]         = style;
+  }
+  if (transform == 'filter') {
+    scale                        = 1.0;
+  }
+  kbd.style.left                 = ((this.container.offsetWidth -
+                                     kbd.offsetWidth/scale)/2) + 'px';
+  kbd.style.top                  = ((this.container.offsetHeight -
+                                     kbd.offsetHeight/scale)/2) + 'px';
+
+  this.keyboard.style.visibility = 'visible';
+};
+
+VT100.prototype.hideSoftKeyboard = function() {
+  this.keyboard.style.display    = 'none';
+};
+
+VT100.prototype.toggleCursorBlinking = function() {
+  this.blinkingCursor = !this.blinkingCursor;
+};
+
+VT100.prototype.about = function() {
+  alert("VT100 Terminal Emulator " + "2.10 (revision 239)" +
+        "\nCopyright 2008-2010 by Markus Gutschke\n" +
+        "For more information check http://shellinabox.com");
+};
+
+VT100.prototype.hideContextMenu = function() {
+  this.menu.style.visibility = 'hidden';
+  this.menu.style.top        = '-100px';
+  this.menu.style.left       = '-100px';
+  this.menu.style.width      = '0px';
+  this.menu.style.height     = '0px';
+};
+
+VT100.prototype.extendContextMenu = function(entries, actions) {
+};
+
+VT100.prototype.showContextMenu = function(x, y) {
+  this.menu.innerHTML         =
+    '<table class="popup" ' +
+           'cellpadding="0" cellspacing="0">' +
+      '<tr><td>' +
+        '<ul id="menuentries">' +
+          '<li id="beginclipboard">Copy</li>' +
+          '<li id="endclipboard">Paste</li>' +
+          '<li id="browserclipboard">Paste from browser</li>' +
+          '<hr />' +
+          '<li id="reset">Reset</li>' +
+          '<hr />' +
+          '<li id="beginconfig">' +
+             (this.utfEnabled ? '<img src="enabled.gif" />' : '') +
+             'Unicode</li>' +
+          '<li>' +
+             (this.visualBell ? '<img src="enabled.gif" />' : '') +
+             'Visual Bell</li>'+
+          '<li>' +
+             (this.softKeyboard ? '<img src="enabled.gif" />' : '') +
+             'Onscreen Keyboard</li>' +
+          '<li id="endconfig">' +
+             (this.blinkingCursor ? '<img src="enabled.gif" />' : '') +
+             'Blinking Cursor</li>'+
+          (this.usercss.firstChild ?
+           '<hr id="beginusercss" />' +
+           this.usercss.innerHTML +
+           '<hr id="endusercss" />' :
+           '<hr />') +
+          '<li id="about">About...</li>' +
+        '</ul>' +
+      '</td></tr>' +
+    '</table>';
+
+  var popup                   = this.menu.firstChild;
+  var menuentries             = this.getChildById(popup, 'menuentries');
+
+  // Determine menu entries that should be disabled
+  this.lastSelection          = this.selection();
+  if (!this.lastSelection.length) {
+    menuentries.firstChild.className
+                              = 'disabled';
+  }
+  var p                       = this.pasteFnc();
+  if (!p) {
+    menuentries.childNodes[1].className
+                              = 'disabled';
+  }
+
+  // Actions for default items
+  var actions                 = [ this.copyLast, p, this.pasteBrowserFnc, this.reset,
+                                  this.toggleUTF, this.toggleBell,
+                                  this.toggleSoftKeyboard,
+                                  this.toggleCursorBlinking ];
+
+  // Actions for user CSS styles (if any)
+  for (var i = 0; i < this.usercssActions.length; ++i) {
+    actions[actions.length]   = this.usercssActions[i];
+  }
+  actions[actions.length]     = this.about;
+
+  // Allow subclasses to dynamically add entries to the context menu
+  this.extendContextMenu(menuentries, actions);
+
+  // Hook up event listeners
+  for (var node = menuentries.firstChild, i = 0; node;
+       node = node.nextSibling) {
+    if (node.tagName == 'LI') {
+      if (node.className != 'disabled') {
+        this.addListener(node, 'mouseover',
+                         function(vt100, node) {
+                           return function() {
+                             node.className = 'hover';
+                           }
+                         }(this, node));
+        this.addListener(node, 'mouseout',
+                         function(vt100, node) {
+                           return function() {
+                             node.className = '';
+                           }
+                         }(this, node));
+        this.addListener(node, 'mousedown',
+                         function(vt100, action) {
+                           return function(event) {
+                             vt100.hideContextMenu();
+                             action.call(vt100);
+                             vt100.storeUserSettings();
+                             return vt100.cancelEvent(event || window.event);
+                           }
+                         }(this, actions[i]));
+        this.addListener(node, 'mouseup',
+                         function(vt100) {
+                           return function(event) {
+                             return vt100.cancelEvent(event || window.event);
+                           }
+                         }(this));
+        this.addListener(node, 'mouseclick',
+                         function(vt100) {
+                           return function(event) {
+                             return vt100.cancelEvent(event || window.event);
+                           }
+                         }());
+      }
+      i++;
+    }
+  }
+
+  // Position menu next to the mouse pointer
+  this.menu.style.left        = '0px';
+  this.menu.style.top         = '0px';
+  this.menu.style.width       =  this.container.offsetWidth  + 'px';
+  this.menu.style.height      =  this.container.offsetHeight + 'px';
+  popup.style.left            = '0px';
+  popup.style.top             = '0px';
+  
+  var margin                  = 2;
+  if (x + popup.clientWidth >= this.container.offsetWidth - margin) {
+    x              = this.container.offsetWidth-popup.clientWidth - margin - 1;
+  }
+  if (x < margin) {
+    x                         = margin;
+  }
+  if (y + popup.clientHeight >= this.container.offsetHeight - margin) {
+    y            = this.container.offsetHeight-popup.clientHeight - margin - 1;
+  }
+  if (y < margin) {
+    y                         = margin;
+  }
+  popup.style.left            = x + 'px';
+  popup.style.top             = y + 'px';
+
+  // Block all other interactions with the terminal emulator
+  this.addListener(this.menu, 'click', function(vt100) {
+                                         return function() {
+                                           vt100.hideContextMenu();
+                                         }
+                                       }(this));
+
+  // Show the menu
+  this.menu.style.visibility  = '';
+};
+
+VT100.prototype.keysPressed = function(ch) {
+  for (var i = 0; i < ch.length; i++) {
+    var c = ch.charCodeAt(i);
+    this.vt100(c >= 7 && c <= 15 ||
+               c == 24 || c == 26 || c == 27 || c >= 32
+               ? String.fromCharCode(c) : '<' + c + '>');
+  }
+};
+
+VT100.prototype.applyModifiers = function(ch, event) {
+  if (ch) {
+    if (event.ctrlKey) {
+      if (ch >= 32 && ch <= 127) {
+        // For historic reasons, some control characters are treated specially
+        switch (ch) {
+        case /* 3 */ 51: ch  =  27; break;
+        case /* 4 */ 52: ch  =  28; break;
+        case /* 5 */ 53: ch  =  29; break;
+        case /* 6 */ 54: ch  =  30; break;
+        case /* 7 */ 55: ch  =  31; break;
+        case /* 8 */ 56: ch  = 127; break;
+        case /* ? */ 63: ch  = 127; break;
+        default:         ch &=  31; break;
+        }
+      }
+    }
+    return String.fromCharCode(ch);
+  } else {
+    return undefined;
+  }
+};
+
+VT100.prototype.handleKey = function(event) {
+  // this.vt100('H: c=' + event.charCode + ', k=' + event.keyCode +
+  //            (event.shiftKey || event.ctrlKey || event.altKey ||
+  //             event.metaKey ? ', ' +
+  //             (event.shiftKey ? 'S' : '') + (event.ctrlKey ? 'C' : '') +
+  //             (event.altKey ? 'A' : '') + (event.metaKey ? 'M' : '') : '') +
+  //            '\r\n');
+  var ch, key;
+  if (typeof event.charCode != 'undefined') {
+    // non-IE keypress events have a translated charCode value. Also, our
+    // fake events generated when receiving keydown events include this data
+    // on all browsers.
+    ch                                = event.charCode;
+    key                               = event.keyCode;
+  } else {
+    // When sending a keypress event, IE includes the translated character
+    // code in the keyCode field.
+    ch                                = event.keyCode;
+    key                               = undefined;
+  }
+
+  // Apply modifier keys (ctrl and shift)
+  if (ch) {
+    key                               = undefined;
+  }
+  ch                                  = this.applyModifiers(ch, event);
+
+  // By this point, "ch" is either defined and contains the character code, or
+  // it is undefined and "key" defines the code of a function key 
+  if (ch != undefined) {
+    this.scrollable.scrollTop         = this.numScrollbackLines *
+                                        this.cursorHeight + 1;
+  } else {
+    if ((event.altKey || event.metaKey) && !event.shiftKey && !event.ctrlKey) {
+      // Many programs have difficulties dealing with parametrized escape
+      // sequences for function keys. Thus, if ALT is the only modifier
+      // key, return Emacs-style keycodes for commonly used keys.
+      switch (key) {
+      case  33: /* Page Up      */ ch = '\u001B<';                      break;
+      case  34: /* Page Down    */ ch = '\u001B>';                      break;
+      case  37: /* Left         */ ch = '\u001Bb';                      break;
+      case  38: /* Up           */ ch = '\u001Bp';                      break;
+      case  39: /* Right        */ ch = '\u001Bf';                      break;
+      case  40: /* Down         */ ch = '\u001Bn';                      break;
+      case  46: /* Delete       */ ch = '\u001Bd';                      break;
+      default:                                                          break;
+      }
+    } else if (event.shiftKey && !event.ctrlKey &&
+               !event.altKey && !event.metaKey) {
+      switch (key) {
+      case  33: /* Page Up      */ this.scrollBack();                   return;
+      case  34: /* Page Down    */ this.scrollFore();                   return;
+      default:                                                          break;
+      }
+    }
+    if (ch == undefined) {
+      switch (key) {
+      case   8: /* Backspace    */ ch = '\u007f';                       break;
+      case   9: /* Tab          */ ch = '\u0009';                       break;
+      case  10: /* Return       */ ch = '\u000A';                       break;
+      case  13: /* Enter        */ ch = this.crLfMode ?
+                                        '\r\n' : '\r';                  break;
+      case  16: /* Shift        */                                      return;
+      case  17: /* Ctrl         */                                      return;
+      case  18: /* Alt          */                                      return;
+      case  19: /* Break        */                                      return;
+      case  20: /* Caps Lock    */                                      return;
+      case  27: /* Escape       */ ch = '\u001B';                       break;
+      case  33: /* Page Up      */ ch = '\u001B[5~';                    break;
+      case  34: /* Page Down    */ ch = '\u001B[6~';                    break;
+      case  35: /* End          */ ch = '\u001BOF';                     break;
+      case  36: /* Home         */ ch = '\u001BOH';                     break;
+      case  37: /* Left         */ ch = this.cursorKeyMode ?
+                             '\u001BOD' : '\u001B[D';                   break;
+      case  38: /* Up           */ ch = this.cursorKeyMode ?
+                             '\u001BOA' : '\u001B[A';                   break;
+      case  39: /* Right        */ ch = this.cursorKeyMode ?
+                             '\u001BOC' : '\u001B[C';                   break;
+      case  40: /* Down         */ ch = this.cursorKeyMode ?
+                             '\u001BOB' : '\u001B[B';                   break;
+      case  45: /* Insert       */ ch = '\u001B[2~';                    break;
+      case  46: /* Delete       */ ch = '\u001B[3~';                    break;
+      case  91: /* Left Window  */                                      return;
+      case  92: /* Right Window */                                      return;
+      case  93: /* Select       */                                      return;
+      case  96: /* 0            */ ch = this.applyModifiers(48, event); break;
+      case  97: /* 1            */ ch = this.applyModifiers(49, event); break;
+      case  98: /* 2            */ ch = this.applyModifiers(50, event); break;
+      case  99: /* 3            */ ch = this.applyModifiers(51, event); break;
+      case 100: /* 4            */ ch = this.applyModifiers(52, event); break;
+      case 101: /* 5            */ ch = this.applyModifiers(53, event); break;
+      case 102: /* 6            */ ch = this.applyModifiers(54, event); break;
+      case 103: /* 7            */ ch = this.applyModifiers(55, event); break;
+      case 104: /* 8            */ ch = this.applyModifiers(56, event); break;
+      case 105: /* 9            */ ch = this.applyModifiers(58, event); break;
+      case 106: /* *            */ ch = this.applyModifiers(42, event); break;
+      case 107: /* +            */ ch = this.applyModifiers(43, event); break;
+      case 109: /* -            */ ch = this.applyModifiers(45, event); break;
+      case 110: /* .            */ ch = this.applyModifiers(46, event); break;
+      case 111: /* /            */ ch = this.applyModifiers(47, event); break;
+      case 112: /* F1           */ ch = '\u001BOP';                     break;
+      case 113: /* F2           */ ch = '\u001BOQ';                     break;
+      case 114: /* F3           */ ch = '\u001BOR';                     break;
+      case 115: /* F4           */ ch = '\u001BOS';                     break;
+      case 116: /* F5           */ ch = '\u001B[15~';                   break;
+      case 117: /* F6           */ ch = '\u001B[17~';                   break;
+      case 118: /* F7           */ ch = '\u001B[18~';                   break;
+      case 119: /* F8           */ ch = '\u001B[19~';                   break;
+      case 120: /* F9           */ ch = '\u001B[20~';                   break;
+      case 121: /* F10          */ ch = '\u001B[21~';                   break;
+      case 122: /* F11          */ ch = '\u001B[23~';                   break;
+      case 123: /* F12          */ ch = '\u001B[24~';                   break;
+      case 144: /* Num Lock     */                                      return;
+      case 145: /* Scroll Lock  */                                      return;
+      case 186: /* ;            */ ch = this.applyModifiers(59, event); break;
+      case 187: /* =            */ ch = this.applyModifiers(61, event); break;
+      case 188: /* ,            */ ch = this.applyModifiers(44, event); break;
+      case 189: /* -            */ ch = this.applyModifiers(45, event); break;
+      case 190: /* .            */ ch = this.applyModifiers(46, event); break;
+      case 191: /* /            */ ch = this.applyModifiers(47, event); break;
+      // Conflicts with dead key " on Swiss keyboards
+      //case 192: /* `            */ ch = this.applyModifiers(96, event); break;
+      // Conflicts with dead key " on Swiss keyboards
+      //case 219: /* [            */ ch = this.applyModifiers(91, event); break;
+      case 220: /* \            */ ch = this.applyModifiers(92, event); break;
+      // Conflicts with dead key ^ and ` on Swiss keaboards
+      //                         ^ and " on French keyboards
+      //case 221: /* ]            */ ch = this.applyModifiers(93, event); break;
+      case 222: /* '            */ ch = this.applyModifiers(39, event); break;
+      default:                                                          return;
+      }
+      this.scrollable.scrollTop       = this.numScrollbackLines *
+                                        this.cursorHeight + 1;
+    }
+  }
+
+  // "ch" now contains the sequence of keycodes to send. But we might still
+  // have to apply the effects of modifier keys.
+  if (event.shiftKey || event.ctrlKey || event.altKey || event.metaKey) {
+    var start, digit, part1, part2;
+    if ((start = ch.substr(0, 2)) == '\u001B[') {
+      for (part1 = start;
+           part1.length < ch.length &&
+             (digit = ch.charCodeAt(part1.length)) >= 48 && digit <= 57; ) {
+        part1                         = ch.substr(0, part1.length + 1);
+      }
+      part2                           = ch.substr(part1.length);
+      if (part1.length > 2) {
+        part1                        += ';';
+      }
+    } else if (start == '\u001BO') {
+      part1                           = start;
+      part2                           = ch.substr(2);
+    }
+    if (part1 != undefined) {
+      ch                              = part1                                 +
+                                       ((event.shiftKey             ? 1 : 0)  +
+                                        (event.altKey|event.metaKey ? 2 : 0)  +
+                                        (event.ctrlKey              ? 4 : 0)) +
+                                        part2;
+    } else if (ch.length == 1 && (event.altKey || event.metaKey)) {
+      ch                              = '\u001B' + ch;
+    }
+  }
+
+  if (this.menu.style.visibility == 'hidden') {
+    // this.vt100('R: c=');
+    // for (var i = 0; i < ch.length; i++)
+    //   this.vt100((i != 0 ? ', ' : '') + ch.charCodeAt(i));
+    // this.vt100('\r\n');
+    this.keysPressed(ch);
+  }
+};
+
+VT100.prototype.inspect = function(o, d) {
+  if (d == undefined) {
+    d       = 0;
+  }
+  var rc    = '';
+  if (typeof o == 'object' && ++d < 2) {
+    rc      = '[\r\n';
+    for (i in o) {
+      rc   += this.spaces(d * 2) + i + ' -> ';
+      try {
+        rc += this.inspect(o[i], d);
+      } catch (e) {
+        rc += '?' + '?' + '?\r\n';
+      }
+    }
+    rc     += ']\r\n';
+  } else {
+    rc     += ('' + o).replace(/\n/g, ' ').replace(/ +/g,' ') + '\r\n';
+  }
+  return rc;
+};
+
+VT100.prototype.checkComposedKeys = function(event) {
+  // Composed keys (at least on Linux) do not generate normal events.
+  // Instead, they get entered into the text field. We normally catch
+  // this on the next keyup event.
+  var s              = this.input.value;
+  if (s.length) {
+    this.input.value = '';
+    if (this.menu.style.visibility == 'hidden') {
+      this.keysPressed(s);
+    }
+  }
+};
+
+VT100.prototype.fixEvent = function(event) {
+  // Some browsers report AltGR as a combination of ALT and CTRL. As AltGr
+  // is used as a second-level selector, clear the modifier bits before
+  // handling the event.
+  if (event.ctrlKey && event.altKey) {
+    var fake                = [ ];
+    fake.charCode           = event.charCode;
+    fake.keyCode            = event.keyCode;
+    fake.ctrlKey            = false;
+    fake.shiftKey           = event.shiftKey;
+    fake.altKey             = false;
+    fake.metaKey            = event.metaKey;
+    return fake;
+  }
+
+  // Some browsers fail to translate keys, if both shift and alt/meta is
+  // pressed at the same time. We try to translate those cases, but that
+  // only works for US keyboard layouts.
+  if (event.shiftKey) {
+    var u                   = undefined;
+    var s                   = undefined;
+    switch (this.lastNormalKeyDownEvent.keyCode) {
+    case  39: /* ' -> " */ u = 39; s =  34; break;
+    case  44: /* , -> < */ u = 44; s =  60; break;
+    case  45: /* - -> _ */ u = 45; s =  95; break;
+    case  46: /* . -> > */ u = 46; s =  62; break;
+    case  47: /* / -> ? */ u = 47; s =  63; break;
+
+    case  48: /* 0 -> ) */ u = 48; s =  41; break;
+    case  49: /* 1 -> ! */ u = 49; s =  33; break;
+    case  50: /* 2 -> @ */ u = 50; s =  64; break;
+    case  51: /* 3 -> # */ u = 51; s =  35; break;
+    case  52: /* 4 -> $ */ u = 52; s =  36; break;
+    case  53: /* 5 -> % */ u = 53; s =  37; break;
+    case  54: /* 6 -> ^ */ u = 54; s =  94; break;
+    case  55: /* 7 -> & */ u = 55; s =  38; break;
+    case  56: /* 8 -> * */ u = 56; s =  42; break;
+    case  57: /* 9 -> ( */ u = 57; s =  40; break;
+
+    case  59: /* ; -> : */ u = 59; s =  58; break;
+    case  61: /* = -> + */ u = 61; s =  43; break;
+    case  91: /* [ -> { */ u = 91; s = 123; break;
+    case  92: /* \ -> | */ u = 92; s = 124; break;
+    case  93: /* ] -> } */ u = 93; s = 125; break; 
+    case  96: /* ` -> ~ */ u = 96; s = 126; break;
+
+    case 109: /* - -> _ */ u = 45; s =  95; break;
+    case 111: /* / -> ? */ u = 47; s =  63; break;
+
+    case 186: /* ; -> : */ u = 59; s =  58; break;
+    case 187: /* = -> + */ u = 61; s =  43; break;
+    case 188: /* , -> < */ u = 44; s =  60; break;
+    case 189: /* - -> _ */ u = 45; s =  95; break;
+    case 190: /* . -> > */ u = 46; s =  62; break;
+    case 191: /* / -> ? */ u = 47; s =  63; break;
+    case 192: /* ` -> ~ */ u = 96; s = 126; break;
+    case 219: /* [ -> { */ u = 91; s = 123; break;
+    case 220: /* \ -> | */ u = 92; s = 124; break;
+    case 221: /* ] -> } */ u = 93; s = 125; break; 
+    case 222: /* ' -> " */ u = 39; s =  34; break;
+    default:                                break;
+    }
+    if (s && (event.charCode == u || event.charCode == 0)) {
+      var fake              = [ ];
+      fake.charCode         = s;
+      fake.keyCode          = event.keyCode;
+      fake.ctrlKey          = event.ctrlKey;
+      fake.shiftKey         = event.shiftKey;
+      fake.altKey           = event.altKey;
+      fake.metaKey          = event.metaKey;
+      return fake;
+    }
+  }
+  return event;
+};
+
+VT100.prototype.keyDown = function(event) {
+  // this.vt100('D: c=' + event.charCode + ', k=' + event.keyCode +
+  //            (event.shiftKey || event.ctrlKey || event.altKey ||
+  //             event.metaKey ? ', ' +
+  //             (event.shiftKey ? 'S' : '') + (event.ctrlKey ? 'C' : '') +
+  //             (event.altKey ? 'A' : '') + (event.metaKey ? 'M' : '') : '') +
+  //            '\r\n');
+  this.checkComposedKeys(event);
+  this.lastKeyPressedEvent      = undefined;
+  this.lastKeyDownEvent         = undefined;
+  this.lastNormalKeyDownEvent   = event;
+
+  // Swiss keyboard conflicts:
+  // [ 59
+  // ] 192
+  // ' 219 (dead key)
+  // { 220
+  // ~ 221 (dead key)
+  // } 223
+  // French keyoard conflicts:
+  // ~ 50 (dead key)
+  // } 107
+  var asciiKey                  =
+    event.keyCode ==  32                         ||
+    event.keyCode >=  48 && event.keyCode <=  57 ||
+    event.keyCode >=  65 && event.keyCode <=  90;
+  var alphNumKey                =
+    asciiKey                                     ||
+    event.keyCode ==  59 ||
+    event.keyCode >=  96 && event.keyCode <= 105 ||
+    event.keyCode == 107 ||
+    event.keyCode == 192 ||
+    event.keyCode >= 219 && event.keyCode <= 221 ||
+    event.keyCode == 223 ||
+    event.keyCode == 226;
+  var normalKey                 =
+    alphNumKey                                   ||
+    event.keyCode ==  61 ||
+    event.keyCode == 106 ||
+    event.keyCode >= 109 && event.keyCode <= 111 ||
+    event.keyCode >= 186 && event.keyCode <= 191 ||
+    event.keyCode == 222 ||
+    event.keyCode == 252;
+  try {
+    if (navigator.appName == 'Konqueror') {
+      normalKey                |= event.keyCode < 128;
+    }
+  } catch (e) {
+  }
+
+  // We normally prefer to look at keypress events, as they perform the
+  // translation from keyCode to charCode. This is important, as the
+  // translation is locale-dependent.
+  // But for some keys, we must intercept them during the keydown event,
+  // as they would otherwise get interpreted by the browser.
+  // Even, when doing all of this, there are some keys that we can never
+  // intercept. This applies to some of the menu navigation keys in IE.
+  // In fact, we see them, but we cannot stop IE from seeing them, too.
+  if ((event.charCode || event.keyCode) &&
+      ((alphNumKey && (event.ctrlKey || event.altKey || event.metaKey) &&
+        !event.shiftKey &&
+        // Some browsers signal AltGR as both CTRL and ALT. Do not try to
+        // interpret this sequence ourselves, as some keyboard layouts use
+        // it for second-level layouts.
+        !(event.ctrlKey && event.altKey)) ||
+       this.catchModifiersEarly && normalKey && !alphNumKey &&
+       (event.ctrlKey || event.altKey || event.metaKey) ||
+       !normalKey)) {
+    this.lastKeyDownEvent       = event;
+    var fake                    = [ ];
+    fake.ctrlKey                = event.ctrlKey;
+    fake.shiftKey               = event.shiftKey;
+    fake.altKey                 = event.altKey;
+    fake.metaKey                = event.metaKey;
+    if (asciiKey) {
+      fake.charCode             = event.keyCode;
+      fake.keyCode              = 0;
+    } else {
+      fake.charCode             = 0;
+      fake.keyCode              = event.keyCode;
+      if (!alphNumKey && event.shiftKey) {
+        fake                    = this.fixEvent(fake);
+      }
+    }
+
+    this.handleKey(fake);
+    this.lastNormalKeyDownEvent = undefined;
+
+    try {
+      // For non-IE browsers
+      event.stopPropagation();
+      event.preventDefault();
+    } catch (e) {
+    }
+    try {
+      // For IE
+      event.cancelBubble = true;
+      event.returnValue  = false;
+      event.keyCode      = 0;
+    } catch (e) {
+    }
+
+    return false;
+  }
+  return true;
+};
+
+VT100.prototype.keyPressed = function(event) {
+  // this.vt100('P: c=' + event.charCode + ', k=' + event.keyCode +
+  //            (event.shiftKey || event.ctrlKey || event.altKey ||
+  //             event.metaKey ? ', ' +
+  //             (event.shiftKey ? 'S' : '') + (event.ctrlKey ? 'C' : '') +
+  //             (event.altKey ? 'A' : '') + (event.metaKey ? 'M' : '') : '') +
+  //            '\r\n');
+  if (this.lastKeyDownEvent) {
+    // If we already processed the key on keydown, do not process it
+    // again here. Ideally, the browser should not even have generated a
+    // keypress event in this case. But that does not appear to always work.
+    this.lastKeyDownEvent     = undefined;
+  } else {
+    this.handleKey(event.altKey || event.metaKey
+                   ? this.fixEvent(event) : event);
+  }
+
+  try {
+    // For non-IE browsers
+    event.preventDefault();
+  } catch (e) {
+  }
+
+  try {
+    // For IE
+    event.cancelBubble = true;
+    event.returnValue  = false;
+    event.keyCode      = 0;
+  } catch (e) {
+  }
+
+  this.lastNormalKeyDownEvent = undefined;
+  this.lastKeyPressedEvent    = event;
+  return false;
+};
+
+VT100.prototype.keyUp = function(event) {
+  // this.vt100('U: c=' + event.charCode + ', k=' + event.keyCode +
+  //            (event.shiftKey || event.ctrlKey || event.altKey ||
+  //             event.metaKey ? ', ' +
+  //             (event.shiftKey ? 'S' : '') + (event.ctrlKey ? 'C' : '') +
+  //             (event.altKey ? 'A' : '') + (event.metaKey ? 'M' : '') : '') +
+  //            '\r\n');
+  if (this.lastKeyPressedEvent) {
+    // The compose key on Linux occasionally confuses the browser and keeps
+    // inserting bogus characters into the input field, even if just a regular
+    // key has been pressed. Detect this case and drop the bogus characters.
+    (event.target ||
+     event.srcElement).value      = '';
+  } else {
+    // This is usually were we notice that a key has been composed and
+    // thus failed to generate normal events.
+    this.checkComposedKeys(event);
+
+    // Some browsers don't report keypress events if ctrl or alt is pressed
+    // for non-alphanumerical keys. Patch things up for now, but in the
+    // future we will catch these keys earlier (in the keydown handler).
+    if (this.lastNormalKeyDownEvent) {
+      // this.vt100('ENABLING EARLY CATCHING OF MODIFIER KEYS\r\n');
+      this.catchModifiersEarly    = true;
+      var asciiKey                =
+        event.keyCode ==  32                         ||
+        // Conflicts with dead key ~ (code 50) on French keyboards
+        //event.keyCode >=  48 && event.keyCode <=  57 ||
+        event.keyCode >=  48 && event.keyCode <=  49 ||
+        event.keyCode >=  51 && event.keyCode <=  57 ||
+        event.keyCode >=  65 && event.keyCode <=  90;
+      var alphNumKey              =
+        asciiKey                                     ||
+        event.keyCode ==  50                         ||
+        event.keyCode >=  96 && event.keyCode <= 105;
+      var normalKey               =
+        alphNumKey                                   ||
+        event.keyCode ==  59 || event.keyCode ==  61 ||
+        event.keyCode == 106 || event.keyCode == 107 ||
+        event.keyCode >= 109 && event.keyCode <= 111 ||
+        event.keyCode >= 186 && event.keyCode <= 192 ||
+        event.keyCode >= 219 && event.keyCode <= 223 ||
+        event.keyCode == 252;
+      var fake                    = [ ];
+      fake.ctrlKey                = event.ctrlKey;
+      fake.shiftKey               = event.shiftKey;
+      fake.altKey                 = event.altKey;
+      fake.metaKey                = event.metaKey;
+      if (asciiKey) {
+        fake.charCode             = event.keyCode;
+        fake.keyCode              = 0;
+      } else {
+        fake.charCode             = 0;
+        fake.keyCode              = event.keyCode;
+        if (!alphNumKey && (event.ctrlKey || event.altKey || event.metaKey)) {
+          fake                    = this.fixEvent(fake);
+        }
+      }
+      this.lastNormalKeyDownEvent = undefined;
+      this.handleKey(fake);
+    }
+  }
+
+  try {
+    // For IE
+    event.cancelBubble            = true;
+    event.returnValue             = false;
+    event.keyCode                 = 0;
+  } catch (e) {
+  }
+
+  this.lastKeyDownEvent           = undefined;
+  this.lastKeyPressedEvent        = undefined;
+  return false;
+};
+
+VT100.prototype.animateCursor = function(inactive) {
+  if (!this.cursorInterval) {
+    this.cursorInterval       = setInterval(
+      function(vt100) {
+        return function() {
+          vt100.animateCursor();
+
+          // Use this opportunity to check whether the user entered a composed
+          // key, or whether somebody pasted text into the textfield.
+          vt100.checkComposedKeys();
+        }
+      }(this), 500);
+  }
+  if (inactive != undefined || this.cursor.className != 'inactive') {
+    if (inactive) {
+      this.cursor.className   = 'inactive';
+    } else {
+      if (this.blinkingCursor) {
+        this.cursor.className = this.cursor.className == 'bright'
+                                ? 'dim' : 'bright';
+      } else {
+        this.cursor.className = 'bright';
+      }
+    }
+  }
+};
+
+VT100.prototype.blurCursor = function() {
+  this.animateCursor(true);
+};
+
+VT100.prototype.focusCursor = function() {
+  this.animateCursor(false);
+};
+
+VT100.prototype.flashScreen = function() {
+  this.isInverted       = !this.isInverted;
+  this.refreshInvertedState();
+  this.isInverted       = !this.isInverted;
+  setTimeout(function(vt100) {
+               return function() {
+                 vt100.refreshInvertedState();
+               };
+             }(this), 100);
+};
+
+VT100.prototype.beep = function() {
+  if (this.visualBell) {
+    this.flashScreen();
+  } else {
+    try {
+      this.beeper.Play();
+    } catch (e) {
+      try {
+        this.beeper.src = 'beep.wav';
+      } catch (e) {
+      }
+    }
+  }
+};
+
+VT100.prototype.bs = function() {
+  if (this.cursorX > 0) {
+    this.gotoXY(this.cursorX - 1, this.cursorY);
+    this.needWrap = false;
+  }
+};
+
+VT100.prototype.ht = function(count) {
+  if (count == undefined) {
+    count        = 1;
+  }
+  var cx         = this.cursorX;
+  while (count-- > 0) {
+    while (cx++ < this.terminalWidth) {
+      var tabState = this.userTabStop[cx];
+      if (tabState == false) {
+        // Explicitly cleared tab stop
+        continue;
+      } else if (tabState) {
+        // Explicitly set tab stop
+        break;
+      } else {
+        // Default tab stop at each eighth column
+        if (cx % 8 == 0) {
+          break;
+        }
+      }
+    }
+  }
+  if (cx > this.terminalWidth - 1) {
+    cx           = this.terminalWidth - 1;
+  }
+  if (cx != this.cursorX) {
+    this.gotoXY(cx, this.cursorY);
+  }
+};
+
+VT100.prototype.rt = function(count) {
+  if (count == undefined) {
+    count          = 1 ;
+  }
+  var cx           = this.cursorX;
+  while (count-- > 0) {
+    while (cx-- > 0) {
+      var tabState = this.userTabStop[cx];
+      if (tabState == false) {
+        // Explicitly cleared tab stop
+        continue;
+      } else if (tabState) {
+        // Explicitly set tab stop
+        break;
+      } else {
+        // Default tab stop at each eighth column
+        if (cx % 8 == 0) {
+          break;
+        }
+      }
+    }
+  }
+  if (cx < 0) {
+    cx             = 0;
+  }
+  if (cx != this.cursorX) {
+    this.gotoXY(cx, this.cursorY);
+  }
+};
+
+VT100.prototype.cr = function() {
+  this.gotoXY(0, this.cursorY);
+  this.needWrap = false;
+};
+
+VT100.prototype.lf = function(count) {
+  if (count == undefined) {
+    count    = 1;
+  } else {
+    if (count > this.terminalHeight) {
+      count  = this.terminalHeight;
+    }
+    if (count < 1) {
+      count  = 1;
+    }
+  }
+  while (count-- > 0) {
+    if (this.cursorY == this.bottom - 1) {
+      this.scrollRegion(0, this.top + 1,
+                        this.terminalWidth, this.bottom - this.top - 1,
+                        0, -1, this.color, this.style);
+      offset = undefined;
+    } else if (this.cursorY < this.terminalHeight - 1) {
+      this.gotoXY(this.cursorX, this.cursorY + 1);
+    }
+  }
+};
+
+VT100.prototype.ri = function(count) {
+  if (count == undefined) {
+    count   = 1;
+  } else {
+    if (count > this.terminalHeight) {
+      count = this.terminalHeight;
+    }
+    if (count < 1) {
+      count = 1;
+    }
+  }
+  while (count-- > 0) {
+    if (this.cursorY == this.top) {
+      this.scrollRegion(0, this.top,
+                        this.terminalWidth, this.bottom - this.top - 1,
+                        0, 1, this.color, this.style);
+    } else if (this.cursorY > 0) {
+      this.gotoXY(this.cursorX, this.cursorY - 1);
+    }
+  }
+  this.needWrap = false;
+};
+
+VT100.prototype.respondID = function() {
+  this.respondString += '\u001B[?6c';
+};
+
+VT100.prototype.respondSecondaryDA = function() {
+  this.respondString += '\u001B[>0;0;0c';
+};
+
+
+VT100.prototype.updateStyle = function() {
+  this.style   = '';
+  if (this.attr & 0x0200 /* ATTR_UNDERLINE */) {
+    this.style = 'text-decoration: underline;';
+  }
+  var bg       = (this.attr >> 4) & 0xF;
+  var fg       =  this.attr       & 0xF;
+  if (this.attr & 0x0100 /* ATTR_REVERSE */) {
+    var tmp    = bg;
+    bg         = fg;
+    fg         = tmp;
+  }
+  if ((this.attr & (0x0100 /* ATTR_REVERSE */ | 0x0400 /* ATTR_DIM */)) == 0x0400 /* ATTR_DIM */) {
+    fg         = 8; // Dark grey
+  } else if (this.attr & 0x0800 /* ATTR_BRIGHT */) {
+    fg        |= 8;
+    this.style = 'font-weight: bold;';
+  }
+  if (this.attr & 0x1000 /* ATTR_BLINK */) {
+    this.style = 'text-decoration: blink;';
+  }
+  this.color   = 'ansi' + fg + ' bgAnsi' + bg;
+};
+
+VT100.prototype.setAttrColors = function(attr) {
+  if (attr != this.attr) {
+    this.attr = attr;
+    this.updateStyle();
+  }
+};
+
+VT100.prototype.saveCursor = function() {
+  this.savedX[this.currentScreen]     = this.cursorX;
+  this.savedY[this.currentScreen]     = this.cursorY;
+  this.savedAttr[this.currentScreen]  = this.attr;
+  this.savedUseGMap                   = this.useGMap;
+  for (var i = 0; i < 4; i++) {
+    this.savedGMap[i]                 = this.GMap[i];
+  }
+  this.savedValid[this.currentScreen] = true;
+};
+
+VT100.prototype.restoreCursor = function() {
+  if (!this.savedValid[this.currentScreen]) {
+    return;
+  }
+  this.attr      = this.savedAttr[this.currentScreen];
+  this.updateStyle();
+  this.useGMap   = this.savedUseGMap;
+  for (var i = 0; i < 4; i++) {
+    this.GMap[i] = this.savedGMap[i];
+  }
+  this.translate = this.GMap[this.useGMap];
+  this.needWrap  = false;
+  this.gotoXY(this.savedX[this.currentScreen],
+              this.savedY[this.currentScreen]);
+};
+
+VT100.prototype.getTransformName = function() {
+  var styles = [ 'transform', 'WebkitTransform', 'MozTransform', 'filter' ];
+  for (var i = 0; i < styles.length; ++i) {
+    if (typeof this.console[0].style[styles[i]] != 'undefined') {
+      return styles[i];
+    }
+  }
+  return undefined;
+};
+
+VT100.prototype.getTransformStyle = function(transform, scale) {
+  return scale && scale != 1.0
+    ? transform == 'filter'
+      ? 'progid:DXImageTransform.Microsoft.Matrix(' +
+                                 'M11=' + (1.0/scale) + ',M12=0,M21=0,M22=1,' +
+                                 "sizingMethod='auto expand')"
+      : 'translateX(-50%) ' +
+        'scaleX(' + (1.0/scale) + ') ' +
+        'translateX(50%)'
+    : '';
+};
+
+VT100.prototype.set80_132Mode = function(state) {
+  var transform                  = this.getTransformName();
+  if (transform) {
+    if ((this.console[this.currentScreen].style[transform] != '') == state) {
+      return;
+    }
+    var style                    = state ?
+                                   this.getTransformStyle(transform, 1.65):'';
+    this.console[this.currentScreen].style[transform] = style;
+    this.cursor.style[transform] = style;
+    this.space.style[transform]  = style;
+    this.scale                   = state ? 1.65 : 1.0;
+    if (transform == 'filter') {
+      this.console[this.currentScreen].style.width = state ? '165%' : '';
+    }
+    this.resizer();
+  }
+};
+
+VT100.prototype.setMode = function(state) {
+  for (var i = 0; i <= this.npar; i++) {
+    if (this.isQuestionMark) {
+      switch (this.par[i]) {
+      case  1: this.cursorKeyMode      = state;                      break;
+      case  3: this.set80_132Mode(state);                            break;
+      case  5: this.isInverted = state; this.refreshInvertedState(); break;
+      case  6: this.offsetMode         = state;                      break;
+      case  7: this.autoWrapMode       = state;                      break;
+      case 1000:
+      case  9: this.mouseReporting     = state;                      break;
+      case 25: this.cursorNeedsShowing = state;
+               if (state) { this.showCursor(); }
+               else       { this.hideCursor(); }                     break;
+      case 1047:
+      case 1049:
+      case 47: this.enableAlternateScreen(state);                    break;
+      default:                                                       break;
+      }
+    } else {
+      switch (this.par[i]) {
+      case  3: this.dispCtrl           = state;                      break;
+      case  4: this.insertMode         = state;                      break;
+      case  20:this.crLfMode           = state;                      break;
+      default:                                                       break;
+      }
+    }
+  }
+};
+
+VT100.prototype.statusReport = function() {
+  // Ready and operational.
+  this.respondString += '\u001B[0n';
+};
+
+VT100.prototype.cursorReport = function() {
+  this.respondString += '\u001B[' +
+                        (this.cursorY + (this.offsetMode ? this.top + 1 : 1)) +
+                        ';' +
+                        (this.cursorX + 1) +
+                        'R';
+};
+
+VT100.prototype.setCursorAttr = function(setAttr, xorAttr) {
+  // Changing of cursor color is not implemented.
+};
+
+VT100.prototype.openPrinterWindow = function() {
+  var rc            = true;
+  try {
+    if (!this.printWin || this.printWin.closed) {
+      this.printWin = window.open('', 'print-output',
+        'width=800,height=600,directories=no,location=no,menubar=yes,' +
+        'status=no,toolbar=no,titlebar=yes,scrollbars=yes,resizable=yes');
+      this.printWin.document.body.innerHTML =
+        '<link rel="stylesheet" href="' +
+          document.location.protocol + '//' + document.location.host +
+          document.location.pathname.replace(/[^/]*$/, '') +
+          'print-styles.css" type="text/css">\n' +
+        '<div id="options"><input id="autoprint" type="checkbox"' +
+          (this.autoprint ? ' checked' : '') + '>' +
+          'Automatically, print page(s) when job is ready' +
+        '</input></div>\n' +
+        '<div id="spacer"><input type="checkbox"> </input></div>' +
+        '<pre id="print"></pre>\n';
+      var autoprint = this.printWin.document.getElementById('autoprint');
+      this.addListener(autoprint, 'click',
+                       (function(vt100, autoprint) {
+                         return function() {
+                           vt100.autoprint = autoprint.checked;
+                           vt100.storeUserSettings();
+                           return false;
+                         };
+                       })(this, autoprint));
+      this.printWin.document.title = 'ShellInABox Printer Output';
+    }
+  } catch (e) {
+    // Maybe, a popup blocker prevented us from working. Better catch the
+    // exception, so that we won't break the entire terminal session. The
+    // user probably needs to disable the blocker first before retrying the
+    // operation.
+    rc              = false;
+  }
+  rc               &= this.printWin && !this.printWin.closed &&
+                      (this.printWin.innerWidth ||
+                       this.printWin.document.documentElement.clientWidth ||
+                       this.printWin.document.body.clientWidth) > 1;
+
+  if (!rc && this.printing == 100) {
+    // Different popup blockers work differently. We try to detect a couple
+    // of common methods. And then we retry again a brief amount later, as
+    // false positives are otherwise possible. If we are sure that there is
+    // a popup blocker in effect, we alert the user to it. This is helpful
+    // as some popup blockers have minimal or no UI, and the user might not
+    // notice that they are missing the popup. In any case, we only show at
+    // most one message per print job.
+    this.printing   = true;
+    setTimeout((function(win) {
+                  return function() {
+                    if (!win || win.closed ||
+                        (win.innerWidth ||
+                         win.document.documentElement.clientWidth ||
+                         win.document.body.clientWidth) <= 1) {
+                      alert('Attempted to print, but a popup blocker ' +
+                            'prevented the printer window from opening');
+                    }
+                  };
+                })(this.printWin), 2000);
+  }
+  return rc;
+};
+
+VT100.prototype.sendToPrinter = function(s) {
+  this.openPrinterWindow();
+  try {
+    var doc   = this.printWin.document;
+    var print = doc.getElementById('print');
+    if (print.lastChild && print.lastChild.nodeName == '#text') {
+      print.lastChild.textContent += this.replaceChar(s, ' ', '\u00A0');
+    } else {
+      print.appendChild(doc.createTextNode(this.replaceChar(s, ' ','\u00A0')));
+    }
+  } catch (e) {
+    // There probably was a more aggressive popup blocker that prevented us
+    // from accessing the printer windows.
+  }
+};
+
+VT100.prototype.sendControlToPrinter = function(ch) {
+  // We get called whenever doControl() is active. But for the printer, we
+  // only implement a basic line printer that doesn't understand most of
+  // the escape sequences of the VT100 terminal. In fact, the only escape
+  // sequence that we really need to recognize is '^[[5i' for turning the
+  // printer off.
+  try {
+    switch (ch) {
+    case  9:
+      // HT
+      this.openPrinterWindow();
+      var doc                 = this.printWin.document;
+      var print               = doc.getElementById('print');
+      var chars               = print.lastChild &&
+                                print.lastChild.nodeName == '#text' ?
+                                print.lastChild.textContent.length : 0;
+      this.sendToPrinter(this.spaces(8 - (chars % 8)));
+      break;
+    case 10:
+      // CR
+      break;
+    case 12:
+      // FF
+      this.openPrinterWindow();
+      var pageBreak           = this.printWin.document.createElement('div');
+      pageBreak.className     = 'pagebreak';
+      pageBreak.innerHTML     = '<hr />';
+      this.printWin.document.getElementById('print').appendChild(pageBreak);
+      break;
+    case 13:
+      // LF
+      this.openPrinterWindow();
+      var lineBreak           = this.printWin.document.createElement('br');
+      this.printWin.document.getElementById('print').appendChild(lineBreak);
+      break;
+    case 27:
+      // ESC
+      this.isEsc              = 1 /* ESesc */;
+      break;
+    default:
+      switch (this.isEsc) {
+      case 1 /* ESesc */:
+        this.isEsc            = 0 /* ESnormal */;
+        switch (ch) {
+        case 0x5B /*[*/:
+          this.isEsc          = 2 /* ESsquare */;
+          break;
+        default:
+          break;
+        }
+        break;
+      case 2 /* ESsquare */:
+        this.npar             = 0;
+        this.par              = [ 0, 0, 0, 0, 0, 0, 0, 0,
+                                  0, 0, 0, 0, 0, 0, 0, 0 ];
+        this.isEsc            = 3 /* ESgetpars */;
+        this.isQuestionMark   = ch == 0x3F /*?*/;
+        if (this.isQuestionMark) {
+          break;
+        }
+        // Fall through
+      case 3 /* ESgetpars */: 
+        if (ch == 0x3B /*;*/) {
+          this.npar++;
+          break;
+        } else if (ch >= 0x30 /*0*/ && ch <= 0x39 /*9*/) {
+          var par             = this.par[this.npar];
+          if (par == undefined) {
+            par               = 0;
+          }
+          this.par[this.npar] = 10*par + (ch & 0xF);
+          break;
+        } else {
+          this.isEsc          = 4 /* ESgotpars */;
+        }
+        // Fall through
+      case 4 /* ESgotpars */:
+        this.isEsc            = 0 /* ESnormal */;
+        if (this.isQuestionMark) {
+          break;
+        }
+        switch (ch) {
+        case 0x69 /*i*/:
+          this.csii(this.par[0]);
+          break;
+        default:
+          break;
+        }
+        break;
+      default:
+        this.isEsc            = 0 /* ESnormal */;
+        break;
+      }
+      break;
+    }
+  } catch (e) {
+    // There probably was a more aggressive popup blocker that prevented us
+    // from accessing the printer windows.
+  }
+};
+
+VT100.prototype.csiAt = function(number) {
+  // Insert spaces
+  if (number == 0) {
+    number      = 1;
+  }
+  if (number > this.terminalWidth - this.cursorX) {
+    number      = this.terminalWidth - this.cursorX;
+  }
+  this.scrollRegion(this.cursorX, this.cursorY,
+                    this.terminalWidth - this.cursorX - number, 1,
+                    number, 0, this.color, this.style);
+  this.needWrap = false;
+};
+
+VT100.prototype.csii = function(number) {
+  // Printer control
+  switch (number) {
+  case 0: // Print Screen
+    window.print();
+    break;
+  case 4: // Stop printing
+    try {
+      if (this.printing && this.printWin && !this.printWin.closed) {
+        var print = this.printWin.document.getElementById('print');
+        while (print.lastChild &&
+               print.lastChild.tagName == 'DIV' &&
+               print.lastChild.className == 'pagebreak') {
+          // Remove trailing blank pages
+          print.removeChild(print.lastChild);
+        }
+        if (this.autoprint) {
+          this.printWin.print();
+        }
+      }
+    } catch (e) {
+    }
+    this.printing = false;
+    break;
+  case 5: // Start printing
+    if (!this.printing && this.printWin && !this.printWin.closed) {
+      this.printWin.document.getElementById('print').innerHTML = '';
+    }
+    this.printing = 100;
+    break;
+  default:
+    break;
+  }
+};
+
+VT100.prototype.csiJ = function(number) {
+  switch (number) {
+  case 0: // Erase from cursor to end of display
+    this.clearRegion(this.cursorX, this.cursorY,
+                     this.terminalWidth - this.cursorX, 1,
+                     this.color, this.style);
+    if (this.cursorY < this.terminalHeight-2) {
+      this.clearRegion(0, this.cursorY+1,
+                       this.terminalWidth, this.terminalHeight-this.cursorY-1,
+                       this.color, this.style);
+    }
+    break;
+  case 1: // Erase from start to cursor
+    if (this.cursorY > 0) {
+      this.clearRegion(0, 0,
+                       this.terminalWidth, this.cursorY,
+                       this.color, this.style);
+    }
+    this.clearRegion(0, this.cursorY, this.cursorX + 1, 1,
+                     this.color, this.style);
+    break;
+  case 2: // Erase whole display
+    this.clearRegion(0, 0, this.terminalWidth, this.terminalHeight,
+                     this.color, this.style);
+    break;
+  default:
+    return;
+  }
+  needWrap = false;
+};
+
+VT100.prototype.csiK = function(number) {
+  switch (number) {
+  case 0: // Erase from cursor to end of line
+    this.clearRegion(this.cursorX, this.cursorY,
+                     this.terminalWidth - this.cursorX, 1,
+                     this.color, this.style);
+    break;
+  case 1: // Erase from start of line to cursor
+    this.clearRegion(0, this.cursorY, this.cursorX + 1, 1,
+                     this.color, this.style);
+    break;
+  case 2: // Erase whole line
+    this.clearRegion(0, this.cursorY, this.terminalWidth, 1,
+                     this.color, this.style);
+    break;
+  default:
+    return;
+  }
+  needWrap = false;
+};
+
+VT100.prototype.csiL = function(number) {
+  // Open line by inserting blank line(s)
+  if (this.cursorY >= this.bottom) {
+    return;
+  }
+  if (number == 0) {
+    number = 1;
+  }
+  if (number > this.bottom - this.cursorY) {
+    number = this.bottom - this.cursorY;
+  }
+  this.scrollRegion(0, this.cursorY,
+                    this.terminalWidth, this.bottom - this.cursorY - number,
+                    0, number, this.color, this.style);
+  needWrap = false;
+};
+
+VT100.prototype.csiM = function(number) {
+  // Delete line(s), scrolling up the bottom of the screen.
+  if (this.cursorY >= this.bottom) {
+    return;
+  }
+  if (number == 0) {
+    number = 1;
+  }
+  if (number > this.bottom - this.cursorY) {
+    number = bottom - cursorY;
+  }
+  this.scrollRegion(0, this.cursorY + number,
+                    this.terminalWidth, this.bottom - this.cursorY - number,
+                    0, -number, this.color, this.style);
+  needWrap = false;
+};
+
+VT100.prototype.csim = function() {
+  for (var i = 0; i <= this.npar; i++) {
+    switch (this.par[i]) {
+    case 0:  this.attr  = 0x00F0 /* ATTR_DEFAULT */;                                break;
+    case 1:  this.attr  = (this.attr & ~0x0400 /* ATTR_DIM */)|0x0800 /* ATTR_BRIGHT */;         break;
+    case 2:  this.attr  = (this.attr & ~0x0800 /* ATTR_BRIGHT */)|0x0400 /* ATTR_DIM */;         break;
+    case 4:  this.attr |= 0x0200 /* ATTR_UNDERLINE */;                              break;
+    case 5:  this.attr |= 0x1000 /* ATTR_BLINK */;                                  break;
+    case 7:  this.attr |= 0x0100 /* ATTR_REVERSE */;                                break;
+    case 10:
+      this.translate    = this.GMap[this.useGMap];
+      this.dispCtrl     = false;
+      this.toggleMeta   = false;
+      break;
+    case 11:
+      this.translate    = this.CodePage437Map;
+      this.dispCtrl     = true;
+      this.toggleMeta   = false;
+      break;
+    case 12:
+      this.translate    = this.CodePage437Map;
+      this.dispCtrl     = true;
+      this.toggleMeta   = true;
+      break;
+    case 21:
+    case 22: this.attr &= ~(0x0800 /* ATTR_BRIGHT */|0x0400 /* ATTR_DIM */);                     break;
+    case 24: this.attr &= ~ 0x0200 /* ATTR_UNDERLINE */;                            break;
+    case 25: this.attr &= ~ 0x1000 /* ATTR_BLINK */;                                break;
+    case 27: this.attr &= ~ 0x0100 /* ATTR_REVERSE */;                              break;
+    case 38: this.attr  = (this.attr & ~(0x0400 /* ATTR_DIM */|0x0800 /* ATTR_BRIGHT */|0x0F))|
+                          0x0200 /* ATTR_UNDERLINE */;                              break;
+    case 39: this.attr &= ~(0x0400 /* ATTR_DIM */|0x0800 /* ATTR_BRIGHT */|0x0200 /* ATTR_UNDERLINE */|0x0F); break;
+    case 49: this.attr |= 0xF0;                                        break;
+    default:
+      if (this.par[i] >= 30 && this.par[i] <= 37) {
+          var fg        = this.par[i] - 30;
+          this.attr     = (this.attr & ~0x0F) | fg;
+      } else if (this.par[i] >= 40 && this.par[i] <= 47) {
+          var bg        = this.par[i] - 40;
+          this.attr     = (this.attr & ~0xF0) | (bg << 4);
+      }
+      break;
+    }
+  }
+  this.updateStyle();
+};
+
+VT100.prototype.csiP = function(number) {
+  // Delete character(s) following cursor
+  if (number == 0) {
+    number = 1;
+  }
+  if (number > this.terminalWidth - this.cursorX) {
+    number = this.terminalWidth - this.cursorX;
+  }
+  this.scrollRegion(this.cursorX + number, this.cursorY,
+                    this.terminalWidth - this.cursorX - number, 1,
+                    -number, 0, this.color, this.style);
+  needWrap = false;
+};
+
+VT100.prototype.csiX = function(number) {
+  // Clear characters following cursor
+  if (number == 0) {
+    number++;
+  }
+  if (number > this.terminalWidth - this.cursorX) {
+    number = this.terminalWidth - this.cursorX;
+  }
+  this.clearRegion(this.cursorX, this.cursorY, number, 1,
+                   this.color, this.style);
+  needWrap = false;
+};
+
+VT100.prototype.settermCommand = function() {
+  // Setterm commands are not implemented
+};
+
+VT100.prototype.doControl = function(ch) {
+  if (this.printing) {
+    this.sendControlToPrinter(ch);
+    return '';
+  }
+  var lineBuf                = '';
+  switch (ch) {
+  case 0x00: /* ignored */                                              break;
+  case 0x08: this.bs();                                                 break;
+  case 0x09: this.ht();                                                 break;
+  case 0x0A:
+  case 0x0B:
+  case 0x0C:
+  case 0x84: this.lf(); if (!this.crLfMode)                             break;
+  case 0x0D: this.cr();                                                 break;
+  case 0x85: this.cr(); this.lf();                                      break;
+  case 0x0E: this.useGMap     = 1;
+             this.translate   = this.GMap[1];
+             this.dispCtrl    = true;                                   break;
+  case 0x0F: this.useGMap     = 0;
+             this.translate   = this.GMap[0];
+             this.dispCtrl    = false;                                  break;
+  case 0x18:
+  case 0x1A: this.isEsc       = 0 /* ESnormal */;                               break;
+  case 0x1B: this.isEsc       = 1 /* ESesc */;                                  break;
+  case 0x7F: /* ignored */                                              break;
+  case 0x88: this.userTabStop[this.cursorX] = true;                     break;
+  case 0x8D: this.ri();                                                 break;
+  case 0x8E: this.isEsc       = 18 /* ESss2 */;                                  break;
+  case 0x8F: this.isEsc       = 19 /* ESss3 */;                                  break;
+  case 0x9A: this.respondID();                                          break;
+  case 0x9B: this.isEsc       = 2 /* ESsquare */;                               break;
+  case 0x07: if (this.isEsc != 17 /* EStitle */) {
+               this.beep();                                             break;
+             }
+             /* fall thru */
+  default:   switch (this.isEsc) {
+    case 1 /* ESesc */:
+      this.isEsc              = 0 /* ESnormal */;
+      switch (ch) {
+/*%*/ case 0x25: this.isEsc   = 13 /* ESpercent */;                              break;
+/*(*/ case 0x28: this.isEsc   = 8 /* ESsetG0 */;                                break;
+/*-*/ case 0x2D:
+/*)*/ case 0x29: this.isEsc   = 9 /* ESsetG1 */;                                break;
+/*.*/ case 0x2E:
+/***/ case 0x2A: this.isEsc   = 10 /* ESsetG2 */;                                break;
+/*/*/ case 0x2F:
+/*+*/ case 0x2B: this.isEsc   = 11 /* ESsetG3 */;                                break;
+/*#*/ case 0x23: this.isEsc   = 7 /* EShash */;                                 break;
+/*7*/ case 0x37: this.saveCursor();                                     break;
+/*8*/ case 0x38: this.restoreCursor();                                  break;
+/*>*/ case 0x3E: this.applKeyMode = false;                              break;
+/*=*/ case 0x3D: this.applKeyMode = true;                               break;
+/*D*/ case 0x44: this.lf();                                             break;
+/*E*/ case 0x45: this.cr(); this.lf();                                  break;
+/*M*/ case 0x4D: this.ri();                                             break;
+/*N*/ case 0x4E: this.isEsc   = 18 /* ESss2 */;                                  break;
+/*O*/ case 0x4F: this.isEsc   = 19 /* ESss3 */;                                  break;
+/*H*/ case 0x48: this.userTabStop[this.cursorX] = true;                 break;
+/*Z*/ case 0x5A: this.respondID();                                      break;
+/*[*/ case 0x5B: this.isEsc   = 2 /* ESsquare */;                               break;
+/*]*/ case 0x5D: this.isEsc   = 15 /* ESnonstd */;                               break;
+/*c*/ case 0x63: this.reset();                                          break;
+/*g*/ case 0x67: this.flashScreen();                                    break;
+      default:                                                          break;
+      }
+      break;
+    case 15 /* ESnonstd */:
+      switch (ch) {
+/*0*/ case 0x30:
+/*1*/ case 0x31:
+/*2*/ case 0x32: this.isEsc   = 17 /* EStitle */; this.titleString = '';         break;
+/*P*/ case 0x50: this.npar    = 0; this.par = [ 0, 0, 0, 0, 0, 0, 0 ];
+                 this.isEsc   = 16 /* ESpalette */;                              break;
+/*R*/ case 0x52: // Palette support is not implemented
+                 this.isEsc   = 0 /* ESnormal */;                               break;
+      default:   this.isEsc   = 0 /* ESnormal */;                               break;
+      }
+      break;
+    case 16 /* ESpalette */:
+      if ((ch >= 0x30 /*0*/ && ch <= 0x39 /*9*/) ||
+          (ch >= 0x41 /*A*/ && ch <= 0x46 /*F*/) ||
+          (ch >= 0x61 /*a*/ && ch <= 0x66 /*f*/)) {
+        this.par[this.npar++] = ch > 0x39  /*9*/ ? (ch & 0xDF) - 55
+                                                : (ch & 0xF);
+        if (this.npar == 7) {
+          // Palette support is not implemented
+          this.isEsc          = 0 /* ESnormal */;
+        }
+      } else {
+        this.isEsc            = 0 /* ESnormal */;
+      }
+      break;
+    case 2 /* ESsquare */:
+      this.npar               = 0;
+      this.par                = [ 0, 0, 0, 0, 0, 0, 0, 0,
+                                  0, 0, 0, 0, 0, 0, 0, 0 ];
+      this.isEsc              = 3 /* ESgetpars */;
+/*[*/ if (ch == 0x5B) { // Function key
+        this.isEsc            = 6 /* ESfunckey */;
+        break;
+      } else {
+/*?*/   this.isQuestionMark   = ch == 0x3F;
+        if (this.isQuestionMark) {
+          break;
+        }
+      }
+      // Fall through
+    case 5 /* ESdeviceattr */:
+    case 3 /* ESgetpars */: 
+/*;*/ if (ch == 0x3B) {
+        this.npar++;
+        break;
+      } else if (ch >= 0x30 /*0*/ && ch <= 0x39 /*9*/) {
+        var par               = this.par[this.npar];
+        if (par == undefined) {
+          par                 = 0;
+        }
+        this.par[this.npar]   = 10*par + (ch & 0xF);
+        break;
+      } else if (this.isEsc == 5 /* ESdeviceattr */) {
+        switch (ch) {
+/*c*/   case 0x63: if (this.par[0] == 0) this.respondSecondaryDA();     break;
+/*m*/   case 0x6D: /* (re)set key modifier resource values */           break;
+/*n*/   case 0x6E: /* disable key modifier resource values */           break;
+/*p*/   case 0x70: /* set pointer mode resource value */                break;
+        default:                                                        break;
+        }
+        this.isEsc            = 0 /* ESnormal */;
+        break;
+      } else {
+        this.isEsc            = 4 /* ESgotpars */;
+      }
+      // Fall through
+    case 4 /* ESgotpars */:
+      this.isEsc              = 0 /* ESnormal */;
+      if (this.isQuestionMark) {
+        switch (ch) {
+/*h*/   case 0x68: this.setMode(true);                                  break;
+/*l*/   case 0x6C: this.setMode(false);                                 break;
+/*c*/   case 0x63: this.setCursorAttr(this.par[2], this.par[1]);        break;
+        default:                                                        break;
+        }
+        this.isQuestionMark   = false;
+        break;
+      }
+      switch (ch) {
+/*!*/ case 0x21: this.isEsc   = 12 /* ESbang */;                                 break;
+/*>*/ case 0x3E: if (!this.npar) this.isEsc  = 5 /* ESdeviceattr */;            break;
+/*G*/ case 0x47:
+/*`*/ case 0x60: this.gotoXY(this.par[0] - 1, this.cursorY);            break;
+/*A*/ case 0x41: this.gotoXY(this.cursorX,
+                             this.cursorY - (this.par[0] ? this.par[0] : 1));
+                                                                        break;
+/*B*/ case 0x42:
+/*e*/ case 0x65: this.gotoXY(this.cursorX,
+                             this.cursorY + (this.par[0] ? this.par[0] : 1));
+                                                                        break;
+/*C*/ case 0x43:
+/*a*/ case 0x61: this.gotoXY(this.cursorX + (this.par[0] ? this.par[0] : 1),
+                             this.cursorY);                             break;
+/*D*/ case 0x44: this.gotoXY(this.cursorX - (this.par[0] ? this.par[0] : 1),
+                             this.cursorY);                             break;
+/*E*/ case 0x45: this.gotoXY(0, this.cursorY + (this.par[0] ? this.par[0] :1));
+                                                                        break;
+/*F*/ case 0x46: this.gotoXY(0, this.cursorY - (this.par[0] ? this.par[0] :1));
+                                                                        break;
+/*d*/ case 0x64: this.gotoXaY(this.cursorX, this.par[0] - 1);           break;
+/*H*/ case 0x48:
+/*f*/ case 0x66: this.gotoXaY(this.par[1] - 1, this.par[0] - 1);        break;
+/*I*/ case 0x49: this.ht(this.par[0] ? this.par[0] : 1);                break;
+/*@*/ case 0x40: this.csiAt(this.par[0]);                               break;
+/*i*/ case 0x69: this.csii(this.par[0]);                                break;
+/*J*/ case 0x4A: this.csiJ(this.par[0]);                                break;
+/*K*/ case 0x4B: this.csiK(this.par[0]);                                break;
+/*L*/ case 0x4C: this.csiL(this.par[0]);                                break;
+/*M*/ case 0x4D: this.csiM(this.par[0]);                                break;
+/*m*/ case 0x6D: this.csim();                                           break;
+/*P*/ case 0x50: this.csiP(this.par[0]);                                break;
+/*X*/ case 0x58: this.csiX(this.par[0]);                                break;
+/*S*/ case 0x53: this.lf(this.par[0] ? this.par[0] : 1);                break;
+/*T*/ case 0x54: this.ri(this.par[0] ? this.par[0] : 1);                break;
+/*c*/ case 0x63: if (!this.par[0]) this.respondID();                    break;
+/*g*/ case 0x67: if (this.par[0] == 0) {
+                   this.userTabStop[this.cursorX] = false;
+                 } else if (this.par[0] == 2 || this.par[0] == 3) {
+                   this.userTabStop               = [ ];
+                   for (var i = 0; i < this.terminalWidth; i++) {
+                     this.userTabStop[i]          = false;
+                   }
+                 }
+                 break;
+/*h*/ case 0x68: this.setMode(true);                                    break;
+/*l*/ case 0x6C: this.setMode(false);                                   break;
+/*n*/ case 0x6E: switch (this.par[0]) {
+                 case 5: this.statusReport();                           break;
+                 case 6: this.cursorReport();                           break;
+                 default:                                               break;
+                 }
+                 break;
+/*q*/ case 0x71: // LED control not implemented
+                                                                        break;
+/*r*/ case 0x72: var t        = this.par[0] ? this.par[0] : 1;
+                 var b        = this.par[1] ? this.par[1]
+                                            : this.terminalHeight;
+                 if (t < b && b <= this.terminalHeight) {
+                   this.top   = t - 1;
+                   this.bottom= b;
+                   this.gotoXaY(0, 0);
+                 }
+                 break;
+/*b*/ case 0x62: var c        = this.par[0] ? this.par[0] : 1;
+                 if (c > this.terminalWidth * this.terminalHeight) {
+                   c          = this.terminalWidth * this.terminalHeight;
+                 }
+                 while (c-- > 0) {
+                   lineBuf   += this.lastCharacter;
+                 }
+                 break;
+/*s*/ case 0x73: this.saveCursor();                                     break;
+/*u*/ case 0x75: this.restoreCursor();                                  break;
+/*Z*/ case 0x5A: this.rt(this.par[0] ? this.par[0] : 1);                break;
+/*]*/ case 0x5D: this.settermCommand();                                 break;
+      default:                                                          break;
+      }
+      break;
+    case 12 /* ESbang */:
+      if (ch == 'p') {
+        this.reset();
+      }
+      this.isEsc              = 0 /* ESnormal */;
+      break;
+    case 13 /* ESpercent */:
+      this.isEsc              = 0 /* ESnormal */;
+      switch (ch) {
+/*@*/ case 0x40: this.utfEnabled = false;                               break;
+/*G*/ case 0x47:
+/*8*/ case 0x38: this.utfEnabled = true;                                break;
+      default:                                                          break;
+      }
+      break;
+    case 6 /* ESfunckey */:
+      this.isEsc              = 0 /* ESnormal */;                               break;
+    case 7 /* EShash */:
+      this.isEsc              = 0 /* ESnormal */;
+/*8*/ if (ch == 0x38) {
+        // Screen alignment test not implemented
+      }
+      break;
+    case 8 /* ESsetG0 */:
+    case 9 /* ESsetG1 */:
+    case 10 /* ESsetG2 */:
+    case 11 /* ESsetG3 */:
+      var g                   = this.isEsc - 8 /* ESsetG0 */;
+      this.isEsc              = 0 /* ESnormal */;
+      switch (ch) {
+/*0*/ case 0x30: this.GMap[g] = this.VT100GraphicsMap;                  break;
+/*A*/ case 0x42:
+/*B*/ case 0x42: this.GMap[g] = this.Latin1Map;                         break;
+/*U*/ case 0x55: this.GMap[g] = this.CodePage437Map;                    break;
+/*K*/ case 0x4B: this.GMap[g] = this.DirectToFontMap;                   break;
+      default:                                                          break;
+      }
+      if (this.useGMap == g) {
+        this.translate        = this.GMap[g];
+      }
+      break;
+    case 17 /* EStitle */:
+      if (ch == 0x07) {
+        if (this.titleString && this.titleString.charAt(0) == ';') {
+          this.titleString    = this.titleString.substr(1);
+          if (this.titleString != '') {
+            this.titleString += ' - ';
+          }
+          this.titleString += 'Shell In A Box'
+        }
+        try {
+          window.document.title = this.titleString;
+        } catch (e) {
+        }
+        this.isEsc            = 0 /* ESnormal */;
+      } else {
+        this.titleString     += String.fromCharCode(ch);
+      }
+      break;
+    case 18 /* ESss2 */:
+    case 19 /* ESss3 */:
+      if (ch < 256) {
+          ch                  = this.GMap[this.isEsc - 18 /* ESss2 */ + 2]
+                                         [this.toggleMeta ? (ch | 0x80) : ch];
+        if ((ch & 0xFF00) == 0xF000) {
+          ch                  = ch & 0xFF;
+        } else if (ch == 0xFEFF || (ch >= 0x200A && ch <= 0x200F)) {
+          this.isEsc         = 0 /* ESnormal */;                                break;
+        }
+      }
+      this.lastCharacter      = String.fromCharCode(ch);
+      lineBuf                += this.lastCharacter;
+      this.isEsc              = 0 /* ESnormal */;                               break;
+    default:
+      this.isEsc              = 0 /* ESnormal */;                               break;
+    }
+    break;
+  }
+  return lineBuf;
+};
+
+VT100.prototype.renderString = function(s, showCursor) {
+  if (this.printing) {
+    this.sendToPrinter(s);
+    if (showCursor) {
+      this.showCursor();
+    }
+    return;
+  }
+
+  // We try to minimize the number of DOM operations by coalescing individual
+  // characters into strings. This is a significant performance improvement.
+  var incX = s.length;
+  if (incX > this.terminalWidth - this.cursorX) {
+    incX   = this.terminalWidth - this.cursorX;
+    if (incX <= 0) {
+      return;
+    }
+    s      = s.substr(0, incX - 1) + s.charAt(s.length - 1);
+  }
+  if (showCursor) {
+    // Minimize the number of calls to putString(), by avoiding a direct
+    // call to this.showCursor()
+    this.cursor.style.visibility = '';
+  }
+  this.putString(this.cursorX, this.cursorY, s, this.color, this.style);
+};
+
+VT100.prototype.vt100 = function(s) {
+  this.cursorNeedsShowing = this.hideCursor();
+  this.respondString      = '';
+  var lineBuf             = '';
+  for (var i = 0; i < s.length; i++) {
+    var ch = s.charCodeAt(i);
+    if (this.utfEnabled) {
+      // Decode UTF8 encoded character
+      if (ch > 0x7F) {
+        if (this.utfCount > 0 && (ch & 0xC0) == 0x80) {
+          this.utfChar    = (this.utfChar << 6) | (ch & 0x3F);
+          if (--this.utfCount <= 0) {
+            if (this.utfChar > 0xFFFF || this.utfChar < 0) {
+              ch = 0xFFFD;
+            } else {
+              ch          = this.utfChar;
+            }
+          } else {
+            continue;
+          }
+        } else {
+          if ((ch & 0xE0) == 0xC0) {
+            this.utfCount = 1;
+            this.utfChar  = ch & 0x1F;
+          } else if ((ch & 0xF0) == 0xE0) {
+            this.utfCount = 2;
+            this.utfChar  = ch & 0x0F;
+          } else if ((ch & 0xF8) == 0xF0) {
+            this.utfCount = 3;
+            this.utfChar  = ch & 0x07;
+          } else if ((ch & 0xFC) == 0xF8) {
+            this.utfCount = 4;
+            this.utfChar  = ch & 0x03;
+          } else if ((ch & 0xFE) == 0xFC) {
+            this.utfCount = 5;
+            this.utfChar  = ch & 0x01;
+          } else {
+            this.utfCount = 0;
+          }
+          continue;
+        }
+      } else {
+        this.utfCount     = 0;
+      }
+    }
+    var isNormalCharacter =
+      (ch >= 32 && ch <= 127 || ch >= 160 ||
+       this.utfEnabled && ch >= 128 ||
+       !(this.dispCtrl ? this.ctrlAlways : this.ctrlAction)[ch & 0x1F]) &&
+      (ch != 0x7F || this.dispCtrl);
+    
+    if (isNormalCharacter && this.isEsc == 0 /* ESnormal */) {
+      if (ch < 256) {
+        ch                = this.translate[this.toggleMeta ? (ch | 0x80) : ch];
+      }
+      if ((ch & 0xFF00) == 0xF000) {
+        ch                = ch & 0xFF;
+      } else if (ch == 0xFEFF || (ch >= 0x200A && ch <= 0x200F)) {
+        continue;
+      }
+      if (!this.printing) {
+        if (this.needWrap || this.insertMode) {
+          if (lineBuf) {
+            this.renderString(lineBuf);
+            lineBuf       = '';
+          }
+        }
+        if (this.needWrap) {
+          this.cr(); this.lf();
+        }
+        if (this.insertMode) {
+          this.scrollRegion(this.cursorX, this.cursorY,
+                            this.terminalWidth - this.cursorX - 1, 1,
+                            1, 0, this.color, this.style);
+        }
+      }
+      this.lastCharacter  = String.fromCharCode(ch);
+      lineBuf            += this.lastCharacter;
+      if (!this.printing &&
+          this.cursorX + lineBuf.length >= this.terminalWidth) {
+        this.needWrap     = this.autoWrapMode;
+      }
+    } else {
+      if (lineBuf) {
+        this.renderString(lineBuf);
+        lineBuf           = '';
+      }
+      var expand          = this.doControl(ch);
+      if (expand.length) {
+        var r             = this.respondString;
+        this.respondString= r + this.vt100(expand);
+      }
+    }
+  }
+  if (lineBuf) {
+    this.renderString(lineBuf, this.cursorNeedsShowing);
+  } else if (this.cursorNeedsShowing) {
+    this.showCursor();
+  }
+  return this.respondString;
+};
+
+VT100.prototype.Latin1Map = [
+0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
+0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
+0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
+0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
+0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
+0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
+0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
+0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
+0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x007F,
+0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
+0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
+0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
+0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
+0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
+0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
+0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
+0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
+0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
+0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
+0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
+0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
+0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
+0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
+0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
+0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF
+];
+
+VT100.prototype.VT100GraphicsMap = [
+0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007,
+0x0008, 0x0009, 0x000A, 0x000B, 0x000C, 0x000D, 0x000E, 0x000F,
+0x0010, 0x0011, 0x0012, 0x0013, 0x0014, 0x0015, 0x0016, 0x0017,
+0x0018, 0x0019, 0x001A, 0x001B, 0x001C, 0x001D, 0x001E, 0x001F,
+0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+0x0028, 0x0029, 0x002A, 0x2192, 0x2190, 0x2191, 0x2193, 0x002F,
+0x2588, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
+0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
+0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x00A0,
+0x25C6, 0x2592, 0x2409, 0x240C, 0x240D, 0x240A, 0x00B0, 0x00B1,
+0x2591, 0x240B, 0x2518, 0x2510, 0x250C, 0x2514, 0x253C, 0xF800,
+0xF801, 0x2500, 0xF803, 0xF804, 0x251C, 0x2524, 0x2534, 0x252C,
+0x2502, 0x2264, 0x2265, 0x03C0, 0x2260, 0x00A3, 0x00B7, 0x007F,
+0x0080, 0x0081, 0x0082, 0x0083, 0x0084, 0x0085, 0x0086, 0x0087,
+0x0088, 0x0089, 0x008A, 0x008B, 0x008C, 0x008D, 0x008E, 0x008F,
+0x0090, 0x0091, 0x0092, 0x0093, 0x0094, 0x0095, 0x0096, 0x0097,
+0x0098, 0x0099, 0x009A, 0x009B, 0x009C, 0x009D, 0x009E, 0x009F,
+0x00A0, 0x00A1, 0x00A2, 0x00A3, 0x00A4, 0x00A5, 0x00A6, 0x00A7,
+0x00A8, 0x00A9, 0x00AA, 0x00AB, 0x00AC, 0x00AD, 0x00AE, 0x00AF,
+0x00B0, 0x00B1, 0x00B2, 0x00B3, 0x00B4, 0x00B5, 0x00B6, 0x00B7,
+0x00B8, 0x00B9, 0x00BA, 0x00BB, 0x00BC, 0x00BD, 0x00BE, 0x00BF,
+0x00C0, 0x00C1, 0x00C2, 0x00C3, 0x00C4, 0x00C5, 0x00C6, 0x00C7,
+0x00C8, 0x00C9, 0x00CA, 0x00CB, 0x00CC, 0x00CD, 0x00CE, 0x00CF,
+0x00D0, 0x00D1, 0x00D2, 0x00D3, 0x00D4, 0x00D5, 0x00D6, 0x00D7,
+0x00D8, 0x00D9, 0x00DA, 0x00DB, 0x00DC, 0x00DD, 0x00DE, 0x00DF,
+0x00E0, 0x00E1, 0x00E2, 0x00E3, 0x00E4, 0x00E5, 0x00E6, 0x00E7,
+0x00E8, 0x00E9, 0x00EA, 0x00EB, 0x00EC, 0x00ED, 0x00EE, 0x00EF,
+0x00F0, 0x00F1, 0x00F2, 0x00F3, 0x00F4, 0x00F5, 0x00F6, 0x00F7,
+0x00F8, 0x00F9, 0x00FA, 0x00FB, 0x00FC, 0x00FD, 0x00FE, 0x00FF
+];
+
+VT100.prototype.CodePage437Map = [
+0x0000, 0x263A, 0x263B, 0x2665, 0x2666, 0x2663, 0x2660, 0x2022,
+0x25D8, 0x25CB, 0x25D9, 0x2642, 0x2640, 0x266A, 0x266B, 0x263C,
+0x25B6, 0x25C0, 0x2195, 0x203C, 0x00B6, 0x00A7, 0x25AC, 0x21A8,
+0x2191, 0x2193, 0x2192, 0x2190, 0x221F, 0x2194, 0x25B2, 0x25BC,
+0x0020, 0x0021, 0x0022, 0x0023, 0x0024, 0x0025, 0x0026, 0x0027,
+0x0028, 0x0029, 0x002A, 0x002B, 0x002C, 0x002D, 0x002E, 0x002F,
+0x0030, 0x0031, 0x0032, 0x0033, 0x0034, 0x0035, 0x0036, 0x0037,
+0x0038, 0x0039, 0x003A, 0x003B, 0x003C, 0x003D, 0x003E, 0x003F,
+0x0040, 0x0041, 0x0042, 0x0043, 0x0044, 0x0045, 0x0046, 0x0047,
+0x0048, 0x0049, 0x004A, 0x004B, 0x004C, 0x004D, 0x004E, 0x004F,
+0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056, 0x0057,
+0x0058, 0x0059, 0x005A, 0x005B, 0x005C, 0x005D, 0x005E, 0x005F,
+0x0060, 0x0061, 0x0062, 0x0063, 0x0064, 0x0065, 0x0066, 0x0067,
+0x0068, 0x0069, 0x006A, 0x006B, 0x006C, 0x006D, 0x006E, 0x006F,
+0x0070, 0x0071, 0x0072, 0x0073, 0x0074, 0x0075, 0x0076, 0x0077,
+0x0078, 0x0079, 0x007A, 0x007B, 0x007C, 0x007D, 0x007E, 0x2302,
+0x00C7, 0x00FC, 0x00E9, 0x00E2, 0x00E4, 0x00E0, 0x00E5, 0x00E7,
+0x00EA, 0x00EB, 0x00E8, 0x00EF, 0x00EE, 0x00EC, 0x00C4, 0x00C5,
+0x00C9, 0x00E6, 0x00C6, 0x00F4, 0x00F6, 0x00F2, 0x00FB, 0x00F9,
+0x00FF, 0x00D6, 0x00DC, 0x00A2, 0x00A3, 0x00A5, 0x20A7, 0x0192,
+0x00E1, 0x00ED, 0x00F3, 0x00FA, 0x00F1, 0x00D1, 0x00AA, 0x00BA,
+0x00BF, 0x2310, 0x00AC, 0x00BD, 0x00BC, 0x00A1, 0x00AB, 0x00BB,
+0x2591, 0x2592, 0x2593, 0x2502, 0x2524, 0x2561, 0x2562, 0x2556,
+0x2555, 0x2563, 0x2551, 0x2557, 0x255D, 0x255C, 0x255B, 0x2510,
+0x2514, 0x2534, 0x252C, 0x251C, 0x2500, 0x253C, 0x255E, 0x255F,
+0x255A, 0x2554, 0x2569, 0x2566, 0x2560, 0x2550, 0x256C, 0x2567,
+0x2568, 0x2564, 0x2565, 0x2559, 0x2558, 0x2552, 0x2553, 0x256B,
+0x256A, 0x2518, 0x250C, 0x2588, 0x2584, 0x258C, 0x2590, 0x2580,
+0x03B1, 0x00DF, 0x0393, 0x03C0, 0x03A3, 0x03C3, 0x00B5, 0x03C4,
+0x03A6, 0x0398, 0x03A9, 0x03B4, 0x221E, 0x03C6, 0x03B5, 0x2229,
+0x2261, 0x00B1, 0x2265, 0x2264, 0x2320, 0x2321, 0x00F7, 0x2248,
+0x00B0, 0x2219, 0x00B7, 0x221A, 0x207F, 0x00B2, 0x25A0, 0x00A0
+];
+
+VT100.prototype.DirectToFontMap = [
+0xF000, 0xF001, 0xF002, 0xF003, 0xF004, 0xF005, 0xF006, 0xF007,
+0xF008, 0xF009, 0xF00A, 0xF00B, 0xF00C, 0xF00D, 0xF00E, 0xF00F,
+0xF010, 0xF011, 0xF012, 0xF013, 0xF014, 0xF015, 0xF016, 0xF017,
+0xF018, 0xF019, 0xF01A, 0xF01B, 0xF01C, 0xF01D, 0xF01E, 0xF01F,
+0xF020, 0xF021, 0xF022, 0xF023, 0xF024, 0xF025, 0xF026, 0xF027,
+0xF028, 0xF029, 0xF02A, 0xF02B, 0xF02C, 0xF02D, 0xF02E, 0xF02F,
+0xF030, 0xF031, 0xF032, 0xF033, 0xF034, 0xF035, 0xF036, 0xF037,
+0xF038, 0xF039, 0xF03A, 0xF03B, 0xF03C, 0xF03D, 0xF03E, 0xF03F,
+0xF040, 0xF041, 0xF042, 0xF043, 0xF044, 0xF045, 0xF046, 0xF047,
+0xF048, 0xF049, 0xF04A, 0xF04B, 0xF04C, 0xF04D, 0xF04E, 0xF04F,
+0xF050, 0xF051, 0xF052, 0xF053, 0xF054, 0xF055, 0xF056, 0xF057,
+0xF058, 0xF059, 0xF05A, 0xF05B, 0xF05C, 0xF05D, 0xF05E, 0xF05F,
+0xF060, 0xF061, 0xF062, 0xF063, 0xF064, 0xF065, 0xF066, 0xF067,
+0xF068, 0xF069, 0xF06A, 0xF06B, 0xF06C, 0xF06D, 0xF06E, 0xF06F,
+0xF070, 0xF071, 0xF072, 0xF073, 0xF074, 0xF075, 0xF076, 0xF077,
+0xF078, 0xF079, 0xF07A, 0xF07B, 0xF07C, 0xF07D, 0xF07E, 0xF07F,
+0xF080, 0xF081, 0xF082, 0xF083, 0xF084, 0xF085, 0xF086, 0xF087,
+0xF088, 0xF089, 0xF08A, 0xF08B, 0xF08C, 0xF08D, 0xF08E, 0xF08F,
+0xF090, 0xF091, 0xF092, 0xF093, 0xF094, 0xF095, 0xF096, 0xF097,
+0xF098, 0xF099, 0xF09A, 0xF09B, 0xF09C, 0xF09D, 0xF09E, 0xF09F,
+0xF0A0, 0xF0A1, 0xF0A2, 0xF0A3, 0xF0A4, 0xF0A5, 0xF0A6, 0xF0A7,
+0xF0A8, 0xF0A9, 0xF0AA, 0xF0AB, 0xF0AC, 0xF0AD, 0xF0AE, 0xF0AF,
+0xF0B0, 0xF0B1, 0xF0B2, 0xF0B3, 0xF0B4, 0xF0B5, 0xF0B6, 0xF0B7,
+0xF0B8, 0xF0B9, 0xF0BA, 0xF0BB, 0xF0BC, 0xF0BD, 0xF0BE, 0xF0BF,
+0xF0C0, 0xF0C1, 0xF0C2, 0xF0C3, 0xF0C4, 0xF0C5, 0xF0C6, 0xF0C7,
+0xF0C8, 0xF0C9, 0xF0CA, 0xF0CB, 0xF0CC, 0xF0CD, 0xF0CE, 0xF0CF,
+0xF0D0, 0xF0D1, 0xF0D2, 0xF0D3, 0xF0D4, 0xF0D5, 0xF0D6, 0xF0D7,
+0xF0D8, 0xF0D9, 0xF0DA, 0xF0DB, 0xF0DC, 0xF0DD, 0xF0DE, 0xF0DF,
+0xF0E0, 0xF0E1, 0xF0E2, 0xF0E3, 0xF0E4, 0xF0E5, 0xF0E6, 0xF0E7,
+0xF0E8, 0xF0E9, 0xF0EA, 0xF0EB, 0xF0EC, 0xF0ED, 0xF0EE, 0xF0EF,
+0xF0F0, 0xF0F1, 0xF0F2, 0xF0F3, 0xF0F4, 0xF0F5, 0xF0F6, 0xF0F7,
+0xF0F8, 0xF0F9, 0xF0FA, 0xF0FB, 0xF0FC, 0xF0FD, 0xF0FE, 0xF0FF
+];
+
+VT100.prototype.ctrlAction = [
+  true,  false, false, false, false, false, false, true,
+  true,  true,  true,  true,  true,  true,  true,  true,
+  false, false, false, false, false, false, false, false,
+  true,  false, true,  true,  false, false, false, false
+];
+
+VT100.prototype.ctrlAlways = [
+  true,  false, false, false, false, false, false, false,
+  true,  false, true,  false, true,  true,  true,  true,
+  false, false, false, false, false, false, false, false,
+  false, false, false, true,  false, false, false, false
+];
+
+
diff --git a/apps/workbench/public/webshell_styles.css b/apps/workbench/public/webshell_styles.css
new file mode 100644
index 0000000..3097cb4
--- /dev/null
+++ b/apps/workbench/public/webshell_styles.css
@@ -0,0 +1,272 @@
+#vt100 a { 
+  text-decoration:      none;
+  color:                inherit;
+}
+
+#vt100 a:hover { 
+  text-decoration:      underline;
+}
+
+#vt100 #reconnect {
+  position:             absolute;
+  z-index:              2;
+}
+
+#vt100 #reconnect input { 
+  padding:              1ex;
+  font-weight:          bold;
+  font-size:            x-large;
+}
+
+#vt100 #cursize {
+  background:           #EEEEEE;
+  border:               1px solid black;
+  font-family:          sans-serif;
+  font-size:            large;
+  font-weight:          bold;
+  padding:              1ex;
+  position:             absolute;
+  z-index:              2;
+}
+
+#vt100 pre { 
+  margin:               0px;
+}
+
+#vt100 pre pre {
+  overflow:             hidden;
+}
+
+#vt100 #scrollable {
+  overflow-x:           hidden;
+  overflow-y:           scroll;
+  position:             relative;
+  padding:              1px;
+}
+
+#vt100 #console, #vt100 #alt_console, #vt100 #cursor, #vt100 #lineheight, #vt100 .hidden pre { 
+  font-family:          "DejaVu Sans Mono", "Everson Mono", FreeMono, "Andale Mono", monospace;
+}
+
+#vt100 #lineheight { 
+  position:             absolute;
+  visibility:           hidden;
+}
+
+#vt100 #cursor {
+  position:             absolute;
+  left:                 0px;
+  top:                  0px;
+  overflow:             hidden;
+  z-index:              1;
+}
+
+#vt100 #cursor.bright {
+  background-color:     black;
+  color:                white;
+}
+
+#vt100 #cursor.dim {
+  visibility:           hidden;
+}
+
+#vt100 #cursor.inactive {
+  border:               1px solid;
+  margin:               -1px;
+}
+
+#vt100 #padding { 
+  visibility:           hidden;
+  width:                1px;
+  height:               0px;
+  overflow:             hidden;
+}
+
+#vt100 .hidden {
+  position:             absolute;
+  top:                  -10000px;
+  left:                 -10000px;
+  width:                0px;
+  height:               0px;
+}
+
+#vt100 #menu { 
+  overflow:             visible;
+  position:             absolute;
+  z-index:              3;
+}
+
+#vt100 #menu .popup {
+  background-color:     #EEEEEE;
+  border:               1px solid black;
+  font-family:          sans-serif;
+  position:             absolute;
+}
+
+#vt100 #menu .popup ul { 
+  list-style-type:      none;
+  padding:              0px;
+  margin:               0px;
+  min-width:            10em;
+}
+
+#vt100 #menu .popup li { 
+  padding:              3px 0.5ex 3px 0.5ex;
+}
+
+#vt100 #menu .popup li.hover {
+  background-color:     #444444;
+  color:                white;
+}
+
+#vt100 #menu .popup li.disabled {
+  color:                #AAAAAA;
+}
+
+#vt100 #menu .popup hr { 
+  margin:               0.5ex 0px 0.5ex 0px;
+}
+
+#vt100 #menu img { 
+  margin-right:         0.5ex;
+  width:                1ex;
+  height:               1ex;
+}
+
+#vt100 #scrollable.inverted { color:            #ffffff;
+                              background-color: #000000; }
+
+#vt100 #kbd_button { 
+  float:                left;
+  position:             fixed;
+  z-index:              0;
+  visibility:           hidden;
+}
+
+#vt100 #keyboard {
+  z-index:              3;
+  position:             absolute;
+}
+
+#vt100 #keyboard .box {
+  font-family:          sans-serif;
+  background-color:     #cccccc;
+  padding:              .8em;
+  float:                left;
+  position:             absolute;
+  border-radius:        10px;
+  -moz-border-radius:   10px;
+  box-shadow:           4px 4px 6px #222222;
+  -webkit-box-shadow:   4px 4px 6px #222222;
+  /* Don't set the -moz-box-shadow. It doesn't properly scale when CSS
+   * transforms are in effect. Once Firefox supports box-shadow, it should
+   * automatically do the right thing. Until then, leave shadows disabled
+   * for Firefox.
+   */
+  opacity:              0.85;
+  -moz-opacity:         0.85;
+  filter:               alpha(opacity=85);
+}
+
+#vt100 #keyboard .box * {
+  vertical-align:       top;
+  display:              inline-block;
+}
+
+#vt100 #keyboard b, #vt100 #keyboard i, #vt100 #keyboard s, #vt100 #keyboard u {
+  font-style:           normal;
+  font-weight:          bold;
+  border-radius:        5px;
+  -moz-border-radius:   5px;
+  background-color:     #555555;
+  color:                #eeeeee;
+  box-shadow:           2px 2px 3px #222222;
+  -webkit-box-shadow:   2px 2px 3px #222222;
+  padding:              4px;
+  margin:               2px;
+  height:               2ex;
+  display:              inline-block;
+  text-align:           center;
+  text-decoration:      none;
+}
+
+#vt100 #keyboard b, #vt100 #keyboard s {
+  width:                2ex;
+}
+
+#vt100 #keyboard u, #vt100 #keyboard s {
+  visibility:           hidden;
+}
+
+#vt100 #keyboard .shifted { 
+  display:              none;
+}
+
+#vt100 #keyboard .selected {
+  color:                #888888;
+  background-color:     #eeeeee;
+  box-shadow:           0px 0px 3px #222222;
+  -webkit-box-shadow:   0px 0px 3px #222222;
+  position:             relative;
+  top:                  1px;
+  left:                 1px;
+}
+
+[if DEFINES_COLORS]
+/* IE cannot properly handle "inherit" properties. So, the monochrome.css/
+ * color.css style sheets cannot work, if we define colors in styles.css.
+ */
+[else DEFINES_COLORS]
+#vt100 .ansi0               {                            }
+#vt100 .ansi1               { color:            #cd0000; }
+#vt100 .ansi2               { color:            #00cd00; }
+#vt100 .ansi3               { color:            #cdcd00; }
+#vt100 .ansi4               { color:            #0000ee; }
+#vt100 .ansi5               { color:            #cd00cd; }
+#vt100 .ansi6               { color:            #00cdcd; }
+#vt100 .ansi7               { color:            #e5e5e5; }
+#vt100 .ansi8               { color:            #7f7f7f; }
+#vt100 .ansi9               { color:            #ff0000; }
+#vt100 .ansi10              { color:            #00ff00; }
+#vt100 .ansi11              { color:            #e8e800; }
+#vt100 .ansi12              { color:            #5c5cff; }
+#vt100 .ansi13              { color:            #ff00ff; }
+#vt100 .ansi14              { color:            #00ffff; }
+#vt100 .ansi15              { color:            #ffffff; }
+
+#vt100 .bgAnsi0             { background-color: #000000; }
+#vt100 .bgAnsi1             { background-color: #cd0000; }
+#vt100 .bgAnsi2             { background-color: #00cd00; }
+#vt100 .bgAnsi3             { background-color: #cdcd00; }
+#vt100 .bgAnsi4             { background-color: #0000ee; }
+#vt100 .bgAnsi5             { background-color: #cd00cd; }
+#vt100 .bgAnsi6             { background-color: #00cdcd; }
+#vt100 .bgAnsi7             { background-color: #e5e5e5; }
+#vt100 .bgAnsi8             { background-color: #7f7f7f; }
+#vt100 .bgAnsi9             { background-color: #ff0000; }
+#vt100 .bgAnsi10            { background-color: #00ff00; }
+#vt100 .bgAnsi11            { background-color: #e8e800; }
+#vt100 .bgAnsi12            { background-color: #5c5cff; }
+#vt100 .bgAnsi13            { background-color: #ff00ff; }
+#vt100 .bgAnsi14            { background-color: #00ffff; }
+#vt100 .bgAnsi15            {                            }
+[endif DEFINES_COLORS]
+
+ at media print {
+  #vt100 .scrollback {
+    display:            none;
+  }
+
+  #vt100 #reconnect, #vt100 #cursor, #vt100 #menu, #vt100 #kbd_button, #vt100 #keyboard { 
+    visibility:         hidden;
+  }
+
+  #vt100 #scrollable { 
+    overflow:           hidden;
+  }
+
+  #vt100 #console, #vt100 #alt_console { 
+    overflow:           hidden;
+    width:              1000000ex;
+  }
+}

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