The Tor Browser / file revision

 // The ray tracer code in this file is written by Adam Burmister. It

 // is available in its original form from:

 //

 //   http://labs.flog.nz.co/raytracer/

 //

 // It has been modified slightly by Google to work as a standalone

 // benchmark, but the all the computational code remains

 // untouched. This file also contains a copy of the Prototype

 // JavaScript framework which is used by the ray tracer.

 var RayTrace = new BenchmarkSuite('RayTrace', 932666, [

   new Benchmark('RayTrace', renderScene)

 ]);

 // Create dummy objects if we're not running in a browser.

 if (typeof document == 'undefined') {

   document = { };

   window = { opera: null };

   navigator = { userAgent: null, appVersion: "" };

 }

 // ------------------------------------------------------------------------

 // ------------------------------------------------------------------------

 /*  Prototype JavaScript framework, version 1.5.0

  *  (c) 2005-2007 Sam Stephenson

  *

  *  Prototype is freely distributable under the terms of an MIT-style license.

  *  For details, see the Prototype web site: http://prototype.conio.net/

  *

 /*--------------------------------------------------------------------------*/

 //--------------------

 var Prototype = {

   Version: '1.5.0',

   BrowserFeatures: {

     XPath: !!document.evaluate

   },

   ScriptFragment: '(?:<script.*?>)((\n|\r|.)*?)(?:<\/script>)',

   emptyFunction: function() {},

   K: function(x) { return x }

 }

 var Class = {

   create: function() {

     return function() {

       this.initialize.apply(this, arguments);

     }

   }

 }

 var Abstract = new Object();

 Object.extend = function(destination, source) {

   for (var property in source) {

     destination[property] = source[property];

   }

   return destination;

 }

 Object.extend(Object, {

   inspect: function(object) {

     try {

       if (object === undefined) return 'undefined';

       if (object === null) return 'null';

       return object.inspect ? object.inspect() : object.toString();

     } catch (e) {

       if (e instanceof RangeError) return '...';

       throw e;

     }

   },

   keys: function(object) {

     var keys = [];

     for (var property in object)

       keys.push(property);

     return keys;

   },

   values: function(object) {

     var values = [];

     for (var property in object)

       values.push(object[property]);

     return values;

   },

   clone: function(object) {

     return Object.extend({}, object);

   }

 });

 Function.prototype.bind = function() {

   var __method = this, args = $A(arguments), object = args.shift();

   return function() {

     return __method.apply(object, args.concat($A(arguments)));

   }

 }

 Function.prototype.bindAsEventListener = function(object) {

   var __method = this, args = $A(arguments), object = args.shift();

   return function(event) {

     return __method.apply(object, [( event || window.event)].concat(args).concat($A(arguments)));

   }

 }

 Object.extend(Number.prototype, {

   toColorPart: function() {

     var digits = this.toString(16);

     if (this < 16) return '0' + digits;

     return digits;

   },

   succ: function() {

     return this + 1;

   },

   times: function(iterator) {

     $R(0, this, true).each(iterator);

     return this;

   }

 });

 var Try = {

   these: function() {

     var returnValue;

     for (var i = 0, length = arguments.length; i < length; i++) {

       var lambda = arguments[i];

       try {

         returnValue = lambda();

         break;

       } catch (e) {}

     }

     return returnValue;

   }

 }

 /*--------------------------------------------------------------------------*/

 var PeriodicalExecuter = Class.create();

 PeriodicalExecuter.prototype = {

   initialize: function(callback, frequency) {

     this.callback = callback;

     this.frequency = frequency;

     this.currentlyExecuting = false;

     this.registerCallback();

   },

   registerCallback: function() {

     this.timer = setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);

   },

   stop: function() {

     if (!this.timer) return;

     clearInterval(this.timer);

     this.timer = null;

   },

   onTimerEvent: function() {

     if (!this.currentlyExecuting) {

       try {

         this.currentlyExecuting = true;

         this.callback(this);

       } finally {

         this.currentlyExecuting = false;

       }

     }

   }

 }

 String.interpret = function(value){

   return value == null ? '' : String(value);

 }

 Object.extend(String.prototype, {

   gsub: function(pattern, replacement) {

     var result = '', source = this, match;

     replacement = arguments.callee.prepareReplacement(replacement);

     while (source.length > 0) {

       if (match = source.match(pattern)) {

         result += source.slice(0, match.index);

         result += String.interpret(replacement(match));

         source  = source.slice(match.index + match[0].length);

       } else {

         result += source, source = '';

       }

     }

     return result;

   },

   sub: function(pattern, replacement, count) {

     replacement = this.gsub.prepareReplacement(replacement);

     count = count === undefined ? 1 : count;

     return this.gsub(pattern, function(match) {

       if (--count < 0) return match[0];

       return replacement(match);

     });

   },

   scan: function(pattern, iterator) {

     this.gsub(pattern, iterator);

     return this;

   },

   truncate: function(length, truncation) {

     length = length || 30;

     truncation = truncation === undefined ? '...' : truncation;

     return this.length > length ?

       this.slice(0, length - truncation.length) + truncation : this;

   },

   strip: function() {

     return this.replace(/^\s+/, '').replace(/\s+$/, '');

   },

   stripTags: function() {

     return this.replace(/<\/?[^>]+>/gi, '');

   },

   stripScripts: function() {

     return this.replace(new RegExp(Prototype.ScriptFragment, 'img'), '');

   },

   extractScripts: function() {

     var matchAll = new RegExp(Prototype.ScriptFragment, 'img');

     var matchOne = new RegExp(Prototype.ScriptFragment, 'im');

     return (this.match(matchAll) || []).map(function(scriptTag) {

       return (scriptTag.match(matchOne) || ['', ''])[1];

     });

   },

   evalScripts: function() {

     return this.extractScripts().map(function(script) { return eval(script) });

   },

   escapeHTML: function() {

     var div = document.createElement('div');

     var text = document.createTextNode(this);

     div.appendChild(text);

     return div.innerHTML;

   },

   unescapeHTML: function() {

     var div = document.createElement('div');

     div.innerHTML = this.stripTags();

     return div.childNodes[0] ? (div.childNodes.length > 1 ?

       $A(div.childNodes).inject('',function(memo,node){ return memo+node.nodeValue }) :

       div.childNodes[0].nodeValue) : '';

   },

   toQueryParams: function(separator) {

     var match = this.strip().match(/([^?#]*)(#.*)?$/);

     if (!match) return {};

     return match[1].split(separator || '&').inject({}, function(hash, pair) {

       if ((pair = pair.split('='))[0]) {

         var name = decodeURIComponent(pair[0]);

         var value = pair[1] ? decodeURIComponent(pair[1]) : undefined;

         if (hash[name] !== undefined) {

           if (hash[name].constructor != Array)

             hash[name] = [hash[name]];

           if (value) hash[name].push(value);

         }

         else hash[name] = value;

       }

       return hash;

     });

   },

   toArray: function() {

     return this.split('');

   },

   succ: function() {

     return this.slice(0, this.length - 1) +

       String.fromCharCode(this.charCodeAt(this.length - 1) + 1);

   },

   camelize: function() {

     var parts = this.split('-'), len = parts.length;

     if (len == 1) return parts[0];

     var camelized = this.charAt(0) == '-'

       ? parts[0].charAt(0).toUpperCase() + parts[0].substring(1)

       : parts[0];

     for (var i = 1; i < len; i++)

       camelized += parts[i].charAt(0).toUpperCase() + parts[i].substring(1);

     return camelized;

   },

   capitalize: function(){

     return this.charAt(0).toUpperCase() + this.substring(1).toLowerCase();

   },

   underscore: function() {

     return this.gsub(/::/, '/').gsub(/([A-Z]+)([A-Z][a-z])/,'#{1}_#{2}').gsub(/([a-z\d])([A-Z])/,'#{1}_#{2}').gsub(/-/,'_').toLowerCase();

   },

   dasherize: function() {

     return this.gsub(/_/,'-');

   },

   inspect: function(useDoubleQuotes) {

     var escapedString = this.replace(/\\/g, '\\\\');

     if (useDoubleQuotes)

       return '"' + escapedString.replace(/"/g, '\\"') + '"';

     else

       return "'" + escapedString.replace(/'/g, '\\\'') + "'";

   }

 });

 String.prototype.gsub.prepareReplacement = function(replacement) {

   if (typeof replacement == 'function') return replacement;

   var template = new Template(replacement);

   return function(match) { return template.evaluate(match) };

 }

 String.prototype.parseQuery = String.prototype.toQueryParams;

 var Template = Class.create();

 Template.Pattern = /(^|.|\r|\n)(#\{(.*?)\})/;

 Template.prototype = {

   initialize: function(template, pattern) {

     this.template = template.toString();

     this.pattern  = pattern || Template.Pattern;

   },

   evaluate: function(object) {

     return this.template.gsub(this.pattern, function(match) {

       var before = match[1];

       if (before == '\\') return match[2];

       return before + String.interpret(object[match[3]]);

     });

   }

 }

 var $break    = new Object();

 var $continue = new Object();

 var Enumerable = {

   each: function(iterator) {

     var index = 0;

     try {

       this._each(function(value) {

         try {

           iterator(value, index++);

         } catch (e) {

           if (e != $continue) throw e;

         }

       });

     } catch (e) {

       if (e != $break) throw e;

     }

     return this;

   },

   eachSlice: function(number, iterator) {

     var index = -number, slices = [], array = this.toArray();

     while ((index += number) < array.length)

       slices.push(array.slice(index, index+number));

     return slices.map(iterator);

   },

   all: function(iterator) {

     var result = true;

     this.each(function(value, index) {

       result = result && !!(iterator || Prototype.K)(value, index);

       if (!result) throw $break;

     });

     return result;

   },

   any: function(iterator) {

     var result = false;

     this.each(function(value, index) {

       if (result = !!(iterator || Prototype.K)(value, index))

         throw $break;

     });

     return result;

   },

   collect: function(iterator) {

     var results = [];

     this.each(function(value, index) {

       results.push((iterator || Prototype.K)(value, index));

     });

     return results;

   },

   detect: function(iterator) {

     var result;

     this.each(function(value, index) {

       if (iterator(value, index)) {

         result = value;

         throw $break;

       }

     });

     return result;

   },

   findAll: function(iterator) {

     var results = [];

     this.each(function(value, index) {

       if (iterator(value, index))

         results.push(value);

     });

     return results;

   },

   grep: function(pattern, iterator) {

     var results = [];

     this.each(function(value, index) {

       var stringValue = value.toString();

       if (stringValue.match(pattern))

         results.push((iterator || Prototype.K)(value, index));

     })

     return results;

   },

   include: function(object) {

     var found = false;

     this.each(function(value) {

       if (value == object) {

         found = true;

         throw $break;

       }

     });

     return found;

   },

   inGroupsOf: function(number, fillWith) {

     fillWith = fillWith === undefined ? null : fillWith;

     return this.eachSlice(number, function(slice) {

       while(slice.length < number) slice.push(fillWith);

       return slice;

     });

   },

   inject: function(memo, iterator) {

     this.each(function(value, index) {

       memo = iterator(memo, value, index);

     });

     return memo;

   },

   invoke: function(method) {

     var args = $A(arguments).slice(1);

     return this.map(function(value) {

       return value[method].apply(value, args);

     });

   },

   max: function(iterator) {

     var result;

     this.each(function(value, index) {

       value = (iterator || Prototype.K)(value, index);

       if (result == undefined || value >= result)

         result = value;

     });

     return result;

   },

   min: function(iterator) {

     var result;

     this.each(function(value, index) {

       value = (iterator || Prototype.K)(value, index);

       if (result == undefined || value < result)

         result = value;

     });

     return result;

   },

   partition: function(iterator) {

     var trues = [], falses = [];

     this.each(function(value, index) {

       ((iterator || Prototype.K)(value, index) ?

         trues : falses).push(value);

     });

     return [trues, falses];

   },

   pluck: function(property) {

     var results = [];

     this.each(function(value, index) {

       results.push(value[property]);

     });

     return results;

   },

   reject: function(iterator) {

     var results = [];

     this.each(function(value, index) {

       if (!iterator(value, index))

         results.push(value);

     });

     return results;

   },

   sortBy: function(iterator) {

     return this.map(function(value, index) {

       return {value: value, criteria: iterator(value, index)};

     }).sort(function(left, right) {

       var a = left.criteria, b = right.criteria;

       return a < b ? -1 : a > b ? 1 : 0;

     }).pluck('value');

   },

   toArray: function() {

     return this.map();

   },

   zip: function() {

     var iterator = Prototype.K, args = $A(arguments);

     if (typeof args.last() == 'function')

       iterator = args.pop();

     var collections = [this].concat(args).map($A);

     return this.map(function(value, index) {

       return iterator(collections.pluck(index));

     });

   },

   size: function() {

     return this.toArray().length;

   },

   inspect: function() {

     return '#<Enumerable:' + this.toArray().inspect() + '>';

   }

 }

 Object.extend(Enumerable, {

   map:     Enumerable.collect,

   find:    Enumerable.detect,

   select:  Enumerable.findAll,

   member:  Enumerable.include,

   entries: Enumerable.toArray

 });

 var $A = Array.from = function(iterable) {

   if (!iterable) return [];

   if (iterable.toArray) {

     return iterable.toArray();

   } else {

     var results = [];

     for (var i = 0, length = iterable.length; i < length; i++)

       results.push(iterable[i]);

     return results;

   }

 }

 Object.extend(Array.prototype, Enumerable);

 if (!Array.prototype._reverse)

   Array.prototype._reverse = Array.prototype.reverse;

 Object.extend(Array.prototype, {

   _each: function(iterator) {

     for (var i = 0, length = this.length; i < length; i++)

       iterator(this[i]);

   },

   clear: function() {

     this.length = 0;

     return this;

   },

   first: function() {

     return this[0];

   },

   last: function() {

     return this[this.length - 1];

   },

   compact: function() {

     return this.select(function(value) {

       return value != null;

     });

   },

   flatten: function() {

     return this.inject([], function(array, value) {

       return array.concat(value && value.constructor == Array ?

         value.flatten() : [value]);

     });

   },

   without: function() {

     var values = $A(arguments);

     return this.select(function(value) {

       return !values.include(value);

     });

   },

   indexOf: function(object) {

     for (var i = 0, length = this.length; i < length; i++)

       if (this[i] == object) return i;

     return -1;

   },

   reverse: function(inline) {

     return (inline !== false ? this : this.toArray())._reverse();

   },

   reduce: function() {

     return this.length > 1 ? this : this[0];

   },

   uniq: function() {

     return this.inject([], function(array, value) {

       return array.include(value) ? array : array.concat([value]);

     });

   },

   clone: function() {

     return [].concat(this);

   },

   size: function() {

     return this.length;

   },

   inspect: function() {

     return '[' + this.map(Object.inspect).join(', ') + ']';

   }

 });

 Array.prototype.toArray = Array.prototype.clone;

 function $w(string){

   string = string.strip();

   return string ? string.split(/\s+/) : [];

 }

 if(window.opera){

   Array.prototype.concat = function(){

     var array = [];

     for(var i = 0, length = this.length; i < length; i++) array.push(this[i]);

     for(var i = 0, length = arguments.length; i < length; i++) {

       if(arguments[i].constructor == Array) {

         for(var j = 0, arrayLength = arguments[i].length; j < arrayLength; j++)

           array.push(arguments[i][j]);

       } else {

         array.push(arguments[i]);

       }

     }

     return array;

   }

 }

 var Hash = function(obj) {

   Object.extend(this, obj || {});

 };

 Object.extend(Hash, {

   toQueryString: function(obj) {

     var parts = [];

 	  this.prototype._each.call(obj, function(pair) {

       if (!pair.key) return;

       if (pair.value && pair.value.constructor == Array) {

         var values = pair.value.compact();

         if (values.length < 2) pair.value = values.reduce();

         else {

         	key = encodeURIComponent(pair.key);

           values.each(function(value) {

             value = value != undefined ? encodeURIComponent(value) : '';

             parts.push(key + '=' + encodeURIComponent(value));

           });

           return;

         }

       }

       if (pair.value == undefined) pair[1] = '';

       parts.push(pair.map(encodeURIComponent).join('='));

 	  });

     return parts.join('&');

   }

 });

 Object.extend(Hash.prototype, Enumerable);

 Object.extend(Hash.prototype, {

   _each: function(iterator) {

     for (var key in this) {

       var value = this[key];

       if (value && value == Hash.prototype[key]) continue;

       var pair = [key, value];

       pair.key = key;

       pair.value = value;

       iterator(pair);

     }

   },

   keys: function() {

     return this.pluck('key');

   },

   values: function() {

     return this.pluck('value');

   },

   merge: function(hash) {

     return $H(hash).inject(this, function(mergedHash, pair) {

       mergedHash[pair.key] = pair.value;

       return mergedHash;

     });

   },

   remove: function() {

     var result;

     for(var i = 0, length = arguments.length; i < length; i++) {

       var value = this[arguments[i]];

       if (value !== undefined){

         if (result === undefined) result = value;

         else {

           if (result.constructor != Array) result = [result];

           result.push(value)

         }

       }

       delete this[arguments[i]];

     }

     return result;

   },

   toQueryString: function() {

     return Hash.toQueryString(this);

   },

   inspect: function() {

     return '#<Hash:{' + this.map(function(pair) {

       return pair.map(Object.inspect).join(': ');

     }).join(', ') + '}>';

   }

 });

 function $H(object) {

   if (object && object.constructor == Hash) return object;

   return new Hash(object);

 };

 ObjectRange = Class.create();

 Object.extend(ObjectRange.prototype, Enumerable);

 Object.extend(ObjectRange.prototype, {

   initialize: function(start, end, exclusive) {

     this.start = start;

     this.end = end;

     this.exclusive = exclusive;

   },

   _each: function(iterator) {

     var value = this.start;

     while (this.include(value)) {

       iterator(value);

       value = value.succ();

     }

   },

   include: function(value) {

     if (value < this.start)

       return false;

     if (this.exclusive)

       return value < this.end;

     return value <= this.end;

   }

 });

 var $R = function(start, end, exclusive) {

   return new ObjectRange(start, end, exclusive);

 }

 var Ajax = {

   getTransport: function() {

     return Try.these(

       function() {return new XMLHttpRequest()},

       function() {return new ActiveXObject('Msxml2.XMLHTTP')},

       function() {return new ActiveXObject('Microsoft.XMLHTTP')}

     ) || false;

   },

   activeRequestCount: 0

 }

 Ajax.Responders = {

   responders: [],

   _each: function(iterator) {

     this.responders._each(iterator);

   },

   register: function(responder) {

     if (!this.include(responder))

       this.responders.push(responder);

   },

   unregister: function(responder) {

     this.responders = this.responders.without(responder);

   },

   dispatch: function(callback, request, transport, json) {

     this.each(function(responder) {

       if (typeof responder[callback] == 'function') {

         try {

           responder[callback].apply(responder, [request, transport, json]);

         } catch (e) {}

       }

     });

   }

 };

 Object.extend(Ajax.Responders, Enumerable);

 Ajax.Responders.register({

   onCreate: function() {

     Ajax.activeRequestCount++;

   },

   onComplete: function() {

     Ajax.activeRequestCount--;

   }

 });

 Ajax.Base = function() {};

 Ajax.Base.prototype = {

   setOptions: function(options) {

     this.options = {

       method:       'post',

       asynchronous: true,

       contentType:  'application/x-www-form-urlencoded',

       encoding:     'UTF-8',

       parameters:   ''

     }

     Object.extend(this.options, options || {});

     this.options.method = this.options.method.toLowerCase();

     if (typeof this.options.parameters == 'string')

       this.options.parameters = this.options.parameters.toQueryParams();

   }

 }

 Ajax.Request = Class.create();

 Ajax.Request.Events =

   ['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

 Ajax.Request.prototype = Object.extend(new Ajax.Base(), {

   _complete: false,

   initialize: function(url, options) {

     this.transport = Ajax.getTransport();

     this.setOptions(options);

     this.request(url);

   },

   request: function(url) {

     this.url = url;

     this.method = this.options.method;

     var params = this.options.parameters;

     if (!['get', 'post'].include(this.method)) {

       // simulate other verbs over post

       params['_method'] = this.method;

       this.method = 'post';

     }

     params = Hash.toQueryString(params);

     if (params && /Konqueror|Safari|KHTML/.test(navigator.userAgent)) params += '&_='

     // when GET, append parameters to URL

     if (this.method == 'get' && params)

       this.url += (this.url.indexOf('?') > -1 ? '&' : '?') + params;

     try {

       Ajax.Responders.dispatch('onCreate', this, this.transport);

       this.transport.open(this.method.toUpperCase(), this.url,

         this.options.asynchronous);

       if (this.options.asynchronous)

         setTimeout(function() { this.respondToReadyState(1) }.bind(this), 10);

       this.transport.onreadystatechange = this.onStateChange.bind(this);

       this.setRequestHeaders();

       var body = this.method == 'post' ? (this.options.postBody || params) : null;

       this.transport.send(body);

       /* Force Firefox to handle ready state 4 for synchronous requests */

       if (!this.options.asynchronous && this.transport.overrideMimeType)

         this.onStateChange();

     }

     catch (e) {

       this.dispatchException(e);

     }

   },

   onStateChange: function() {

     var readyState = this.transport.readyState;

     if (readyState > 1 && !((readyState == 4) && this._complete))

       this.respondToReadyState(this.transport.readyState);

   },

   setRequestHeaders: function() {

     var headers = {

       'X-Requested-With': 'XMLHttpRequest',

       'X-Prototype-Version': Prototype.Version,

       'Accept': 'text/javascript, text/html, application/xml, text/xml, */*'

     };

     if (this.method == 'post') {

       headers['Content-type'] = this.options.contentType +

         (this.options.encoding ? '; charset=' + this.options.encoding : '');

       /* Force "Connection: close" for older Mozilla browsers to work

        * around a bug where XMLHttpRequest sends an incorrect

        * Content-length header. See Mozilla Bugzilla #246651.

        */

       if (this.transport.overrideMimeType &&

           (navigator.userAgent.match(/Gecko\/(\d{4})/) || [0,2005])[1] < 2005)

             headers['Connection'] = 'close';

     }

     // user-defined headers

     if (typeof this.options.requestHeaders == 'object') {

       var extras = this.options.requestHeaders;

       if (typeof extras.push == 'function')

         for (var i = 0, length = extras.length; i < length; i += 2)

           headers[extras[i]] = extras[i+1];

       else

         $H(extras).each(function(pair) { headers[pair.key] = pair.value });

     }

     for (var name in headers)

       this.transport.setRequestHeader(name, headers[name]);

   },

   success: function() {

     return !this.transport.status

         || (this.transport.status >= 200 && this.transport.status < 300);

   },

   respondToReadyState: function(readyState) {

     var state = Ajax.Request.Events[readyState];

     var transport = this.transport, json = this.evalJSON();

     if (state == 'Complete') {

       try {

         this._complete = true;

         (this.options['on' + this.transport.status]

          || this.options['on' + (this.success() ? 'Success' : 'Failure')]

          || Prototype.emptyFunction)(transport, json);

       } catch (e) {

         this.dispatchException(e);

       }

       if ((this.getHeader('Content-type') || 'text/javascript').strip().

         match(/^(text|application)\/(x-)?(java|ecma)script(;.*)?$/i))

           this.evalResponse();

     }

     try {

       (this.options['on' + state] || Prototype.emptyFunction)(transport, json);

       Ajax.Responders.dispatch('on' + state, this, transport, json);

     } catch (e) {

       this.dispatchException(e);

     }

     if (state == 'Complete') {

       // avoid memory leak in MSIE: clean up

       this.transport.onreadystatechange = Prototype.emptyFunction;

     }

   },

   getHeader: function(name) {

     try {

       return this.transport.getResponseHeader(name);

     } catch (e) { return null }

   },

   evalJSON: function() {

     try {

       var json = this.getHeader('X-JSON');

       return json ? eval('(' + json + ')') : null;

     } catch (e) { return null }

   },

   evalResponse: function() {

     try {

       return eval(this.transport.responseText);

     } catch (e) {

       this.dispatchException(e);

     }

   },

   dispatchException: function(exception) {

     (this.options.onException || Prototype.emptyFunction)(this, exception);

     Ajax.Responders.dispatch('onException', this, exception);

   }

 });

 Ajax.Updater = Class.create();

 Object.extend(Object.extend(Ajax.Updater.prototype, Ajax.Request.prototype), {

   initialize: function(container, url, options) {

     this.container = {

       success: (container.success || container),

       failure: (container.failure || (container.success ? null : container))

     }

     this.transport = Ajax.getTransport();

     this.setOptions(options);

     var onComplete = this.options.onComplete || Prototype.emptyFunction;

     this.options.onComplete = (function(transport, param) {

       this.updateContent();

       onComplete(transport, param);

     }).bind(this);

     this.request(url);

   },

   updateContent: function() {

     var receiver = this.container[this.success() ? 'success' : 'failure'];

     var response = this.transport.responseText;

     if (!this.options.evalScripts) response = response.stripScripts();

     if (receiver = $(receiver)) {

       if (this.options.insertion)

         new this.options.insertion(receiver, response);

       else

         receiver.update(response);

     }

     if (this.success()) {

       if (this.onComplete)

         setTimeout(this.onComplete.bind(this), 10);

     }

   }

 });

 Ajax.PeriodicalUpdater = Class.create();

 Ajax.PeriodicalUpdater.prototype = Object.extend(new Ajax.Base(), {

   initialize: function(container, url, options) {

     this.setOptions(options);

     this.onComplete = this.options.onComplete;

     this.frequency = (this.options.frequency || 2);

     this.decay = (this.options.decay || 1);

     this.updater = {};

     this.container = container;

     this.url = url;

     this.start();

   },

   start: function() {

     this.options.onComplete = this.updateComplete.bind(this);

     this.onTimerEvent();

   },

   stop: function() {

     this.updater.options.onComplete = undefined;

     clearTimeout(this.timer);

     (this.onComplete || Prototype.emptyFunction).apply(this, arguments);

   },

   updateComplete: function(request) {

     if (this.options.decay) {

       this.decay = (request.responseText == this.lastText ?

         this.decay * this.options.decay : 1);

       this.lastText = request.responseText;

     }

     this.timer = setTimeout(this.onTimerEvent.bind(this),

       this.decay * this.frequency * 1000);

   },

   onTimerEvent: function() {

     this.updater = new Ajax.Updater(this.container, this.url, this.options);

   }

 });

 function $(element) {

   if (arguments.length > 1) {

     for (var i = 0, elements = [], length = arguments.length; i < length; i++)

       elements.push($(arguments[i]));

     return elements;

   }

   if (typeof element == 'string')

     element = document.getElementById(element);

   return Element.extend(element);

 }

 if (Prototype.BrowserFeatures.XPath) {

   document._getElementsByXPath = function(expression, parentElement) {

     var results = [];

     var query = document.evaluate(expression, $(parentElement) || document,

       null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);

     for (var i = 0, length = query.snapshotLength; i < length; i++)

       results.push(query.snapshotItem(i));

     return results;

   };

 }

 document.getElementsByClassName = function(className, parentElement) {

   if (Prototype.BrowserFeatures.XPath) {

     var q = ".//*[contains(concat(' ', @class, ' '), ' " + className + " ')]";

     return document._getElementsByXPath(q, parentElement);

   } else {

     var children = ($(parentElement) || document.body).getElementsByTagName('*');

     var elements = [], child;

     for (var i = 0, length = children.length; i < length; i++) {

       child = children[i];

       if (Element.hasClassName(child, className))

         elements.push(Element.extend(child));

     }

     return elements;

   }

 };

 /*--------------------------------------------------------------------------*/

 if (!window.Element)

   var Element = new Object();

 Element.extend = function(element) {

   if (!element || _nativeExtensions || element.nodeType == 3) return element;

   if (!element._extended && element.tagName && element != window) {

     var methods = Object.clone(Element.Methods), cache = Element.extend.cache;

     if (element.tagName == 'FORM')

       Object.extend(methods, Form.Methods);

     if (['INPUT', 'TEXTAREA', 'SELECT'].include(element.tagName))

       Object.extend(methods, Form.Element.Methods);

     Object.extend(methods, Element.Methods.Simulated);

     for (var property in methods) {

       var value = methods[property];

       if (typeof value == 'function' && !(property in element))

         element[property] = cache.findOrStore(value);

     }

   }

   element._extended = true;

   return element;

 };

 Element.extend.cache = {

   findOrStore: function(value) {

     return this[value] = this[value] || function() {

       return value.apply(null, [this].concat($A(arguments)));

     }

   }

 };

 Element.Methods = {

   visible: function(element) {

     return $(element).style.display != 'none';

   },

   toggle: function(element) {

     element = $(element);

     Element[Element.visible(element) ? 'hide' : 'show'](element);

     return element;

   },

   hide: function(element) {

     $(element).style.display = 'none';

     return element;

   },

   show: function(element) {

     $(element).style.display = '';

     return element;

   },

   remove: function(element) {

     element = $(element);

     element.parentNode.removeChild(element);

     return element;

   },

   update: function(element, html) {

     html = typeof html == 'undefined' ? '' : html.toString();

     $(element).innerHTML = html.stripScripts();

     setTimeout(function() {html.evalScripts()}, 10);

     return element;

   },

   replace: function(element, html) {

     element = $(element);

     html = typeof html == 'undefined' ? '' : html.toString();

     if (element.outerHTML) {

       element.outerHTML = html.stripScripts();

     } else {

       var range = element.ownerDocument.createRange();

       range.selectNodeContents(element);

       element.parentNode.replaceChild(

         range.createContextualFragment(html.stripScripts()), element);

     }

     setTimeout(function() {html.evalScripts()}, 10);

     return element;

   },

   inspect: function(element) {

     element = $(element);

     var result = '<' + element.tagName.toLowerCase();

     $H({'id': 'id', 'className': 'class'}).each(function(pair) {

       var property = pair.first(), attribute = pair.last();

       var value = (element[property] || '').toString();

       if (value) result += ' ' + attribute + '=' + value.inspect(true);

     });

     return result + '>';

   },

   recursivelyCollect: function(element, property) {

     element = $(element);

     var elements = [];

     while (element = element[property])

       if (element.nodeType == 1)

         elements.push(Element.extend(element));

     return elements;

   },

   ancestors: function(element) {

     return $(element).recursivelyCollect('parentNode');

   },

   descendants: function(element) {

     return $A($(element).getElementsByTagName('*'));

   },

   immediateDescendants: function(element) {

     if (!(element = $(element).firstChild)) return [];

     while (element && element.nodeType != 1) element = element.nextSibling;

     if (element) return [element].concat($(element).nextSiblings());

     return [];

   },

   previousSiblings: function(element) {

     return $(element).recursivelyCollect('previousSibling');

   },

   nextSiblings: function(element) {

     return $(element).recursivelyCollect('nextSibling');

   },

   siblings: function(element) {

     element = $(element);

     return element.previousSiblings().reverse().concat(element.nextSiblings());

   },

   match: function(element, selector) {

     if (typeof selector == 'string')

       selector = new Selector(selector);

     return selector.match($(element));

   },

   up: function(element, expression, index) {

     return Selector.findElement($(element).ancestors(), expression, index);

   },

   down: function(element, expression, index) {

     return Selector.findElement($(element).descendants(), expression, index);

   },

   previous: function(element, expression, index) {

     return Selector.findElement($(element).previousSiblings(), expression, index);

   },

   next: function(element, expression, index) {

     return Selector.findElement($(element).nextSiblings(), expression, index);

   },

   getElementsBySelector: function() {

     var args = $A(arguments), element = $(args.shift());

     return Selector.findChildElements(element, args);

   },

   getElementsByClassName: function(element, className) {

     return document.getElementsByClassName(className, element);

   },

   readAttribute: function(element, name) {

     element = $(element);

     if (document.all && !window.opera) {

       var t = Element._attributeTranslations;

       if (t.values[name]) return t.values[name](element, name);

       if (t.names[name])  name = t.names[name];

       var attribute = element.attributes[name];

       if(attribute) return attribute.nodeValue;

     }

     return element.getAttribute(name);

   },

   getHeight: function(element) {

     return $(element).getDimensions().height;

   },

   getWidth: function(element) {

     return $(element).getDimensions().width;

   },

   classNames: function(element) {

     return new Element.ClassNames(element);

   },

   hasClassName: function(element, className) {

     if (!(element = $(element))) return;

     var elementClassName = element.className;

     if (elementClassName.length == 0) return false;

     if (elementClassName == className ||

         elementClassName.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))

       return true;

     return false;

   },

   addClassName: function(element, className) {

     if (!(element = $(element))) return;

     Element.classNames(element).add(className);

     return element;

   },

   removeClassName: function(element, className) {

     if (!(element = $(element))) return;

     Element.classNames(element).remove(className);

     return element;

   },

   toggleClassName: function(element, className) {

     if (!(element = $(element))) return;

     Element.classNames(element)[element.hasClassName(className) ? 'remove' : 'add'](className);

     return element;

   },

   observe: function() {

     Event.observe.apply(Event, arguments);

     return $A(arguments).first();

   },

   stopObserving: function() {

     Event.stopObserving.apply(Event, arguments);

     return $A(arguments).first();

   },

   // removes whitespace-only text node children

   cleanWhitespace: function(element) {

     element = $(element);

     var node = element.firstChild;

     while (node) {

       var nextNode = node.nextSibling;

       if (node.nodeType == 3 && !/\S/.test(node.nodeValue))

         element.removeChild(node);

       node = nextNode;

     }

     return element;

   },

   empty: function(element) {

     return $(element).innerHTML.match(/^\s*$/);

   },

   descendantOf: function(element, ancestor) {

     element = $(element), ancestor = $(ancestor);

     while (element = element.parentNode)

       if (element == ancestor) return true;

     return false;

   },

   scrollTo: function(element) {

     element = $(element);

     var pos = Position.cumulativeOffset(element);

     window.scrollTo(pos[0], pos[1]);

     return element;

   },

   getStyle: function(element, style) {

     element = $(element);

     if (['float','cssFloat'].include(style))

       style = (typeof element.style.styleFloat != 'undefined' ? 'styleFloat' : 'cssFloat');

     style = style.camelize();

     var value = element.style[style];

     if (!value) {

       if (document.defaultView && document.defaultView.getComputedStyle) {

         var css = document.defaultView.getComputedStyle(element, null);

         value = css ? css[style] : null;

       } else if (element.currentStyle) {

         value = element.currentStyle[style];

       }

     }

     if((value == 'auto') && ['width','height'].include(style) && (element.getStyle('display') != 'none'))

       value = element['offset'+style.capitalize()] + 'px';

     if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))

       if (Element.getStyle(element, 'position') == 'static') value = 'auto';

     if(style == 'opacity') {

       if(value) return parseFloat(value);

       if(value = (element.getStyle('filter') || '').match(/alpha\(opacity=(.*)\)/))

         if(value[1]) return parseFloat(value[1]) / 100;

       return 1.0;

     }

     return value == 'auto' ? null : value;

   },

   setStyle: function(element, style) {

     element = $(element);

     for (var name in style) {

       var value = style[name];

       if(name == 'opacity') {

         if (value == 1) {

           value = (/Gecko/.test(navigator.userAgent) &&

             !/Konqueror|Safari|KHTML/.test(navigator.userAgent)) ? 0.999999 : 1.0;

           if(/MSIE/.test(navigator.userAgent) && !window.opera)

             element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');

         } else if(value == '') {

           if(/MSIE/.test(navigator.userAgent) && !window.opera)

             element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'');

         } else {

           if(value < 0.00001) value = 0;

           if(/MSIE/.test(navigator.userAgent) && !window.opera)

             element.style.filter = element.getStyle('filter').replace(/alpha\([^\)]*\)/gi,'') +

               'alpha(opacity='+value*100+')';

         }

       } else if(['float','cssFloat'].include(name)) name = (typeof element.style.styleFloat != 'undefined') ? 'styleFloat' : 'cssFloat';

       element.style[name.camelize()] = value;

     }

     return element;

   },

   getDimensions: function(element) {

     element = $(element);

     var display = $(element).getStyle('display');

     if (display != 'none' && display != null) // Safari bug

       return {width: element.offsetWidth, height: element.offsetHeight};

     // All *Width and *Height properties give 0 on elements with display none,

     // so enable the element temporarily

     var els = element.style;

     var originalVisibility = els.visibility;

     var originalPosition = els.position;

     var originalDisplay = els.display;

     els.visibility = 'hidden';

     els.position = 'absolute';

     els.display = 'block';

     var originalWidth = element.clientWidth;

     var originalHeight = element.clientHeight;

     els.display = originalDisplay;

     els.position = originalPosition;

     els.visibility = originalVisibility;

     return {width: originalWidth, height: originalHeight};

   },

   makePositioned: function(element) {

     element = $(element);

     var pos = Element.getStyle(element, 'position');

     if (pos == 'static' || !pos) {

       element._madePositioned = true;

       element.style.position = 'relative';

       // Opera returns the offset relative to the positioning context, when an

       // element is position relative but top and left have not been defined

       if (window.opera) {

         element.style.top = 0;

         element.style.left = 0;

       }

     }

     return element;

   },

   undoPositioned: function(element) {

     element = $(element);

     if (element._madePositioned) {

       element._madePositioned = undefined;

       element.style.position =

         element.style.top =

         element.style.left =

         element.style.bottom =

         element.style.right = '';

     }

     return element;

   },

   makeClipping: function(element) {

     element = $(element);

     if (element._overflow) return element;

     element._overflow = element.style.overflow || 'auto';

     if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')

       element.style.overflow = 'hidden';

     return element;

   },

   undoClipping: function(element) {

     element = $(element);

     if (!element._overflow) return element;

     element.style.overflow = element._overflow == 'auto' ? '' : element._overflow;

     element._overflow = null;

     return element;

   }

 };

 Object.extend(Element.Methods, {childOf: Element.Methods.descendantOf});

 Element._attributeTranslations = {};

 Element._attributeTranslations.names = {

   colspan:   "colSpan",

   rowspan:   "rowSpan",

   valign:    "vAlign",

   datetime:  "dateTime",

   accesskey: "accessKey",

   tabindex:  "tabIndex",

   enctype:   "encType",

   maxlength: "maxLength",

   readonly:  "readOnly",

   longdesc:  "longDesc"

 };

 Element._attributeTranslations.values = {

   _getAttr: function(element, attribute) {

     return element.getAttribute(attribute, 2);

   },

   _flag: function(element, attribute) {

     return $(element).hasAttribute(attribute) ? attribute : null;

   },

   style: function(element) {

     return element.style.cssText.toLowerCase();

   },

   title: function(element) {

     var node = element.getAttributeNode('title');

     return node.specified ? node.nodeValue : null;

   }

 };

 Object.extend(Element._attributeTranslations.values, {

   href: Element._attributeTranslations.values._getAttr,

   src:  Element._attributeTranslations.values._getAttr,

   disabled: Element._attributeTranslations.values._flag,

   checked:  Element._attributeTranslations.values._flag,

   readonly: Element._attributeTranslations.values._flag,

   multiple: Element._attributeTranslations.values._flag

 });

 Element.Methods.Simulated = {

   hasAttribute: function(element, attribute) {

     var t = Element._attributeTranslations;

     attribute = t.names[attribute] || attribute;

     return $(element).getAttributeNode(attribute).specified;

   }

 };

 // IE is missing .innerHTML support for TABLE-related elements

 if (document.all && !window.opera){

   Element.Methods.update = function(element, html) {

     element = $(element);

     html = typeof html == 'undefined' ? '' : html.toString();

     var tagName = element.tagName.toUpperCase();

     if (['THEAD','TBODY','TR','TD'].include(tagName)) {

       var div = document.createElement('div');

       switch (tagName) {

         case 'THEAD':

         case 'TBODY':

           div.innerHTML = '<table><tbody>' +  html.stripScripts() + '</tbody></table>';

           depth = 2;

           break;

         case 'TR':

           div.innerHTML = '<table><tbody><tr>' +  html.stripScripts() + '</tr></tbody></table>';

           depth = 3;

           break;

         case 'TD':

           div.innerHTML = '<table><tbody><tr><td>' +  html.stripScripts() + '</td></tr></tbody></table>';

           depth = 4;

       }

       $A(element.childNodes).each(function(node){

         element.removeChild(node)

       });

       depth.times(function(){ div = div.firstChild });

       $A(div.childNodes).each(

         function(node){ element.appendChild(node) });

     } else {

       element.innerHTML = html.stripScripts();

     }

     setTimeout(function() {html.evalScripts()}, 10);

     return element;

   }

 };

 Object.extend(Element, Element.Methods);

 var _nativeExtensions = false;

 if(/Konqueror|Safari|KHTML/.test(navigator.userAgent))

   ['', 'Form', 'Input', 'TextArea', 'Select'].each(function(tag) {

     var className = 'HTML' + tag + 'Element';

     if(window[className]) return;

     var klass = window[className] = {};

     klass.prototype = document.createElement(tag ? tag.toLowerCase() : 'div').__proto__;

   });

 Element.addMethods = function(methods) {

   Object.extend(Element.Methods, methods || {});

   function copy(methods, destination, onlyIfAbsent) {

     onlyIfAbsent = onlyIfAbsent || false;

     var cache = Element.extend.cache;

     for (var property in methods) {

       var value = methods[property];

       if (!onlyIfAbsent || !(property in destination))

         destination[property] = cache.findOrStore(value);

     }

   }

   if (typeof HTMLElement != 'undefined') {

     copy(Element.Methods, HTMLElement.prototype);

     copy(Element.Methods.Simulated, HTMLElement.prototype, true);

     copy(Form.Methods, HTMLFormElement.prototype);

     [HTMLInputElement, HTMLTextAreaElement, HTMLSelectElement].each(function(klass) {

       copy(Form.Element.Methods, klass.prototype);

     });

     _nativeExtensions = true;

   }

 }

 var Toggle = new Object();

 Toggle.display = Element.toggle;

 /*--------------------------------------------------------------------------*/

 Abstract.Insertion = function(adjacency) {

   this.adjacency = adjacency;

 }

 Abstract.Insertion.prototype = {

   initialize: function(element, content) {

     this.element = $(element);

     this.content = content.stripScripts();

     if (this.adjacency && this.element.insertAdjacentHTML) {

       try {

         this.element.insertAdjacentHTML(this.adjacency, this.content);

       } catch (e) {

         var tagName = this.element.tagName.toUpperCase();

         if (['TBODY', 'TR'].include(tagName)) {

           this.insertContent(this.contentFromAnonymousTable());

         } else {

           throw e;

         }

       }

     } else {

       this.range = this.element.ownerDocument.createRange();

       if (this.initializeRange) this.initializeRange();

       this.insertContent([this.range.createContextualFragment(this.content)]);

     }

     setTimeout(function() {content.evalScripts()}, 10);

   },

   contentFromAnonymousTable: function() {

     var div = document.createElement('div');

     div.innerHTML = '<table><tbody>' + this.content + '</tbody></table>';

     return $A(div.childNodes[0].childNodes[0].childNodes);

   }

 }

 var Insertion = new Object();

 Insertion.Before = Class.create();

 Insertion.Before.prototype = Object.extend(new Abstract.Insertion('beforeBegin'), {

   initializeRange: function() {

     this.range.setStartBefore(this.element);

   },

   insertContent: function(fragments) {

     fragments.each((function(fragment) {

       this.element.parentNode.insertBefore(fragment, this.element);

     }).bind(this));

   }

 });

 Insertion.Top = Class.create();

 Insertion.Top.prototype = Object.extend(new Abstract.Insertion('afterBegin'), {

   initializeRange: function() {

     this.range.selectNodeContents(this.element);

     this.range.collapse(true);

   },

   insertContent: function(fragments) {

     fragments.reverse(false).each((function(fragment) {

       this.element.insertBefore(fragment, this.element.firstChild);

     }).bind(this));

   }

 });

 Insertion.Bottom = Class.create();

 Insertion.Bottom.prototype = Object.extend(new Abstract.Insertion('beforeEnd'), {

   initializeRange: function() {

     this.range.selectNodeContents(this.element);

     this.range.collapse(this.element);

   },

   insertContent: function(fragments) {

     fragments.each((function(fragment) {

       this.element.appendChild(fragment);

     }).bind(this));

   }

 });

 Insertion.After = Class.create();

 Insertion.After.prototype = Object.extend(new Abstract.Insertion('afterEnd'), {

   initializeRange: function() {

     this.range.setStartAfter(this.element);

   },

   insertContent: function(fragments) {

     fragments.each((function(fragment) {

       this.element.parentNode.insertBefore(fragment,

         this.element.nextSibling);

     }).bind(this));

   }

 });

 /*--------------------------------------------------------------------------*/

 Element.ClassNames = Class.create();

 Element.ClassNames.prototype = {

   initialize: function(element) {

     this.element = $(element);

   },

   _each: function(iterator) {

     this.element.className.split(/\s+/).select(function(name) {

       return name.length > 0;

     })._each(iterator);

   },

   set: function(className) {

     this.element.className = className;

   },

   add: function(classNameToAdd) {

     if (this.include(classNameToAdd)) return;

     this.set($A(this).concat(classNameToAdd).join(' '));

   },

   remove: function(classNameToRemove) {

     if (!this.include(classNameToRemove)) return;

     this.set($A(this).without(classNameToRemove).join(' '));

   },

   toString: function() {

     return $A(this).join(' ');

   }

 };

 Object.extend(Element.ClassNames.prototype, Enumerable);

 var Selector = Class.create();

 Selector.prototype = {

   initialize: function(expression) {

     this.params = {classNames: []};

     this.expression = expression.toString().strip();

     this.parseExpression();

     this.compileMatcher();

   },

   parseExpression: function() {

     function abort(message) { throw 'Parse error in selector: ' + message; }

     if (this.expression == '')  abort('empty expression');

     var params = this.params, expr = this.expression, match, modifier, clause, rest;

     while (match = expr.match(/^(.*)\[([a-z0-9_:-]+?)(?:([~\|!]?=)(?:"([^"]*)"|([^\]\s]*)))?\]$/i)) {

       params.attributes = params.attributes || [];

       params.attributes.push({name: match[2], operator: match[3], value: match[4] || match[5] || ''});

       expr = match[1];

     }

     if (expr == '*') return this.params.wildcard = true;

     while (match = expr.match(/^([^a-z0-9_-])?([a-z0-9_-]+)(.*)/i)) {

       modifier = match[1], clause = match[2], rest = match[3];

       switch (modifier) {

         case '#':       params.id = clause; break;

         case '.':       params.classNames.push(clause); break;

         case '':

         case undefined: params.tagName = clause.toUpperCase(); break;

         default:        abort(expr.inspect());

       }

       expr = rest;

     }

     if (expr.length > 0) abort(expr.inspect());

   },

   buildMatchExpression: function() {

     var params = this.params, conditions = [], clause;

     if (params.wildcard)

       conditions.push('true');

     if (clause = params.id)

       conditions.push('element.readAttribute("id") == ' + clause.inspect());

     if (clause = params.tagName)

       conditions.push('element.tagName.toUpperCase() == ' + clause.inspect());

     if ((clause = params.classNames).length > 0)

       for (var i = 0, length = clause.length; i < length; i++)

         conditions.push('element.hasClassName(' + clause[i].inspect() + ')');

     if (clause = params.attributes) {

       clause.each(function(attribute) {

         var value = 'element.readAttribute(' + attribute.name.inspect() + ')';

         var splitValueBy = function(delimiter) {

           return value + ' && ' + value + '.split(' + delimiter.inspect() + ')';

         }

         switch (attribute.operator) {

           case '=':       conditions.push(value + ' == ' + attribute.value.inspect()); break;

           case '~=':      conditions.push(splitValueBy(' ') + '.include(' + attribute.value.inspect() + ')'); break;

           case '|=':      conditions.push(

                             splitValueBy('-') + '.first().toUpperCase() == ' + attribute.value.toUpperCase().inspect()

                           ); break;

           case '!=':      conditions.push(value + ' != ' + attribute.value.inspect()); break;

           case '':

           case undefined: conditions.push('element.hasAttribute(' + attribute.name.inspect() + ')'); break;

           default:        throw 'Unknown operator ' + attribute.operator + ' in selector';

         }

       });

     }

     return conditions.join(' && ');

   },

   compileMatcher: function() {

     this.match = new Function('element', 'if (!element.tagName) return false; \

       element = $(element); \

       return ' + this.buildMatchExpression());

   },

   findElements: function(scope) {

     var element;

     if (element = $(this.params.id))

       if (this.match(element))

         if (!scope || Element.childOf(element, scope))

           return [element];

     scope = (scope || document).getElementsByTagName(this.params.tagName || '*');

     var results = [];

     for (var i = 0, length = scope.length; i < length; i++)

       if (this.match(element = scope[i]))

         results.push(Element.extend(element));

     return results;

   },

   toString: function() {

     return this.expression;

   }

 }

 Object.extend(Selector, {

   matchElements: function(elements, expression) {

     var selector = new Selector(expression);

     return elements.select(selector.match.bind(selector)).map(Element.extend);

   },

   findElement: function(elements, expression, index) {

     if (typeof expression == 'number') index = expression, expression = false;

     return Selector.matchElements(elements, expression || '*')[index || 0];

   },

   findChildElements: function(element, expressions) {

     return expressions.map(function(expression) {

       return expression.match(/[^\s"]+(?:"[^"]*"[^\s"]+)*/g).inject([null], function(results, expr) {

         var selector = new Selector(expr);

         return results.inject([], function(elements, result) {

           return elements.concat(selector.findElements(result || element));

         });

       });

     }).flatten();

   }

 });

 function $$() {

   return Selector.findChildElements(document, $A(arguments));

 }

 var Form = {

   reset: function(form) {

     $(form).reset();

     return form;

   },

   serializeElements: function(elements, getHash) {

     var data = elements.inject({}, function(result, element) {

       if (!element.disabled && element.name) {

         var key = element.name, value = $(element).getValue();

         if (value != undefined) {

           if (result[key]) {

             if (result[key].constructor != Array) result[key] = [result[key]];

             result[key].push(value);

           }

           else result[key] = value;

         }

       }

       return result;

     });

     return getHash ? data : Hash.toQueryString(data);

   }

 };

 Form.Methods = {

   serialize: function(form, getHash) {

     return Form.serializeElements(Form.getElements(form), getHash);

   },

   getElements: function(form) {

     return $A($(form).getElementsByTagName('*')).inject([],

       function(elements, child) {

         if (Form.Element.Serializers[child.tagName.toLowerCase()])

           elements.push(Element.extend(child));

         return elements;

       }

     );

   },

   getInputs: function(form, typeName, name) {

     form = $(form);

     var inputs = form.getElementsByTagName('input');

     if (!typeName && !name) return $A(inputs).map(Element.extend);

     for (var i = 0, matchingInputs = [], length = inputs.length; i < length; i++) {

       var input = inputs[i];

       if ((typeName && input.type != typeName) || (name && input.name != name))

         continue;

       matchingInputs.push(Element.extend(input));

     }

     return matchingInputs;

   },

   disable: function(form) {

     form = $(form);

     form.getElements().each(function(element) {

       element.blur();

       element.disabled = 'true';

     });

     return form;

   },

   enable: function(form) {

     form = $(form);

     form.getElements().each(function(element) {

       element.disabled = '';

     });

     return form;

   },

   findFirstElement: function(form) {

     return $(form).getElements().find(function(element) {

       return element.type != 'hidden' && !element.disabled &&

         ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());

     });

   },

   focusFirstElement: function(form) {

     form = $(form);

     form.findFirstElement().activate();

     return form;

   }

 }

 Object.extend(Form, Form.Methods);

 /*--------------------------------------------------------------------------*/

 Form.Element = {

   focus: function(element) {

     $(element).focus();

     return element;

   },

   select: function(element) {

     $(element).select();

     return element;

   }

 }

 Form.Element.Methods = {

   serialize: function(element) {

     element = $(element);

     if (!element.disabled && element.name) {

       var value = element.getValue();

       if (value != undefined) {

         var pair = {};

         pair[element.name] = value;

         return Hash.toQueryString(pair);

       }

     }

     return '';

   },

   getValue: function(element) {

     element = $(element);

     var method = element.tagName.toLowerCase();

     return Form.Element.Serializers[method](element);

   },

   clear: function(element) {

     $(element).value = '';

     return element;

   },

   present: function(element) {

     return $(element).value != '';

   },

   activate: function(element) {

     element = $(element);

     element.focus();

     if (element.select && ( element.tagName.toLowerCase() != 'input' ||

       !['button', 'reset', 'submit'].include(element.type) ) )

       element.select();

     return element;

   },

   disable: function(element) {

     element = $(element);

     element.disabled = true;

     return element;

   },

   enable: function(element) {

     element = $(element);

     element.blur();

     element.disabled = false;

     return element;

   }

 }

 Object.extend(Form.Element, Form.Element.Methods);

 var Field = Form.Element;

 var $F = Form.Element.getValue;

 /*--------------------------------------------------------------------------*/

 Form.Element.Serializers = {

   input: function(element) {

     switch (element.type.toLowerCase()) {

       case 'checkbox':

       case 'radio':

         return Form.Element.Serializers.inputSelector(element);

       default:

         return Form.Element.Serializers.textarea(element);

     }

   },

   inputSelector: function(element) {

     return element.checked ? element.value : null;

   },

   textarea: function(element) {

     return element.value;

   },

   select: function(element) {

     return this[element.type == 'select-one' ?

       'selectOne' : 'selectMany'](element);

   },

   selectOne: function(element) {

     var index = element.selectedIndex;

     return index >= 0 ? this.optionValue(element.options[index]) : null;

   },

   selectMany: function(element) {

     var values, length = element.length;

     if (!length) return null;

     for (var i = 0, values = []; i < length; i++) {

       var opt = element.options[i];

       if (opt.selected) values.push(this.optionValue(opt));

     }

     return values;

   },

   optionValue: function(opt) {

     // extend element because hasAttribute may not be native

     return Element.extend(opt).hasAttribute('value') ? opt.value : opt.text;

   }

 }

 /*--------------------------------------------------------------------------*/

 Abstract.TimedObserver = function() {}

 Abstract.TimedObserver.prototype = {

   initialize: function(element, frequency, callback) {

     this.frequency = frequency;

     this.element   = $(element);

     this.callback  = callback;

     this.lastValue = this.getValue();

     this.registerCallback();

   },

   registerCallback: function() {

     setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);

   },

   onTimerEvent: function() {

     var value = this.getValue();

     var changed = ('string' == typeof this.lastValue && 'string' == typeof value

       ? this.lastValue != value : String(this.lastValue) != String(value));

     if (changed) {

       this.callback(this.element, value);

       this.lastValue = value;

     }

   }

 }

 Form.Element.Observer = Class.create();

 Form.Element.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {

   getValue: function() {

     return Form.Element.getValue(this.element);

   }

 });

 Form.Observer = Class.create();

 Form.Observer.prototype = Object.extend(new Abstract.TimedObserver(), {

   getValue: function() {

     return Form.serialize(this.element);

   }

 });

 /*--------------------------------------------------------------------------*/

 Abstract.EventObserver = function() {}

 Abstract.EventObserver.prototype = {

   initialize: function(element, callback) {

     this.element  = $(element);

     this.callback = callback;

     this.lastValue = this.getValue();

     if (this.element.tagName.toLowerCase() == 'form')

       this.registerFormCallbacks();

     else

       this.registerCallback(this.element);

   },

   onElementEvent: function() {

     var value = this.getValue();

     if (this.lastValue != value) {

       this.callback(this.element, value);

       this.lastValue = value;

     }

   },

   registerFormCallbacks: function() {

     Form.getElements(this.element).each(this.registerCallback.bind(this));

   },

   registerCallback: function(element) {

     if (element.type) {

       switch (element.type.toLowerCase()) {

         case 'checkbox':

         case 'radio':

           Event.observe(element, 'click', this.onElementEvent.bind(this));

           break;

         default:

           Event.observe(element, 'change', this.onElementEvent.bind(this));

           break;

       }

     }

   }

 }

 Form.Element.EventObserver = Class.create();

 Form.Element.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {

   getValue: function() {

     return Form.Element.getValue(this.element);

   }

 });

 Form.EventObserver = Class.create();

 Form.EventObserver.prototype = Object.extend(new Abstract.EventObserver(), {

   getValue: function() {

     return Form.serialize(this.element);

   }

 });

 if (!window.Event) {

   var Event = new Object();

 }

 Object.extend(Event, {

   KEY_BACKSPACE: 8,

   KEY_TAB:       9,

   KEY_RETURN:   13,

   KEY_ESC:      27,

   KEY_LEFT:     37,

   KEY_UP:       38,

   KEY_RIGHT:    39,

   KEY_DOWN:     40,

   KEY_DELETE:   46,

   KEY_HOME:     36,

   KEY_END:      35,

   KEY_PAGEUP:   33,

   KEY_PAGEDOWN: 34,

   element: function(event) {

     return event.target || event.srcElement;

   },

   isLeftClick: function(event) {

     return (((event.which) && (event.which == 1)) ||

             ((event.button) && (event.button == 1)));

   },

   pointerX: function(event) {

     return event.pageX || (event.clientX +

       (document.documentElement.scrollLeft || document.body.scrollLeft));

   },

   pointerY: function(event) {

     return event.pageY || (event.clientY +

       (document.documentElement.scrollTop || document.body.scrollTop));

   },

   stop: function(event) {

     if (event.preventDefault) {

       event.preventDefault();

       event.stopPropagation();

     } else {

       event.returnValue = false;

       event.cancelBubble = true;

     }

   },

   // find the first node with the given tagName, starting from the

   // node the event was triggered on; traverses the DOM upwards

   findElement: function(event, tagName) {

     var element = Event.element(event);

     while (element.parentNode && (!element.tagName ||

         (element.tagName.toUpperCase() != tagName.toUpperCase())))

       element = element.parentNode;

     return element;

   },

   observers: false,

   _observeAndCache: function(element, name, observer, useCapture) {

     if (!this.observers) this.observers = [];

     if (element.addEventListener) {

       this.observers.push([element, name, observer, useCapture]);

       element.addEventListener(name, observer, useCapture);

     } else if (element.attachEvent) {

       this.observers.push([element, name, observer, useCapture]);

       element.attachEvent('on' + name, observer);

     }

   },

   unloadCache: function() {

     if (!Event.observers) return;

     for (var i = 0, length = Event.observers.length; i < length; i++) {

       Event.stopObserving.apply(this, Event.observers[i]);

       Event.observers[i][0] = null;

     }

     Event.observers = false;

   },

   observe: function(element, name, observer, useCapture) {

     element = $(element);

     useCapture = useCapture || false;

     if (name == 'keypress' &&

         (navigator.appVersion.match(/Konqueror|Safari|KHTML/)

         || element.attachEvent))

       name = 'keydown';

     Event._observeAndCache(element, name, observer, useCapture);

   },

   stopObserving: function(element, name, observer, useCapture) {

     element = $(element);

     useCapture = useCapture || false;

     if (name == 'keypress' &&

         (navigator.appVersion.match(/Konqueror|Safari|KHTML/)

         || element.detachEvent))

       name = 'keydown';

     if (element.removeEventListener) {

       element.removeEventListener(name, observer, useCapture);

     } else if (element.detachEvent) {

       try {

         element.detachEvent('on' + name, observer);

       } catch (e) {}

     }

   }

 });

 /* prevent memory leaks in IE */

 if (navigator.appVersion.match(/\bMSIE\b/))

   Event.observe(window, 'unload', Event.unloadCache, false);

 var Position = {

   // set to true if needed, warning: firefox performance problems

   // NOT neeeded for page scrolling, only if draggable contained in

   // scrollable elements

   includeScrollOffsets: false,

   // must be called before calling withinIncludingScrolloffset, every time the

   // page is scrolled

   prepare: function() {

     this.deltaX =  window.pageXOffset

                 || document.documentElement.scrollLeft

                 || document.body.scrollLeft

                 || 0;

     this.deltaY =  window.pageYOffset

                 || document.documentElement.scrollTop

                 || document.body.scrollTop

                 || 0;

   },

   realOffset: function(element) {

     var valueT = 0, valueL = 0;

     do {

       valueT += element.scrollTop  || 0;

       valueL += element.scrollLeft || 0;

       element = element.parentNode;

     } while (element);

     return [valueL, valueT];

   },

   cumulativeOffset: function(element) {

     var valueT = 0, valueL = 0;

     do {

       valueT += element.offsetTop  || 0;

       valueL += element.offsetLeft || 0;

       element = element.offsetParent;

     } while (element);

     return [valueL, valueT];

   },

   positionedOffset: function(element) {

     var valueT = 0, valueL = 0;

     do {

       valueT += element.offsetTop  || 0;

       valueL += element.offsetLeft || 0;

       element = element.offsetParent;

       if (element) {

         if(element.tagName=='BODY') break;

         var p = Element.getStyle(element, 'position');

         if (p == 'relative' || p == 'absolute') break;

       }

     } while (element);

     return [valueL, valueT];

   },

   offsetParent: function(element) {

     if (element.offsetParent) return element.offsetParent;

     if (element == document.body) return element;

     while ((element = element.parentNode) && element != document.body)

       if (Element.getStyle(element, 'position') != 'static')

         return element;

     return document.body;

   },

   // caches x/y coordinate pair to use with overlap

   within: function(element, x, y) {

     if (this.includeScrollOffsets)

       return this.withinIncludingScrolloffsets(element, x, y);

     this.xcomp = x;

     this.ycomp = y;

     this.offset = this.cumulativeOffset(element);

     return (y >= this.offset[1] &&

             y <  this.offset[1] + element.offsetHeight &&

             x >= this.offset[0] &&

             x <  this.offset[0] + element.offsetWidth);

   },

   withinIncludingScrolloffsets: function(element, x, y) {

     var offsetcache = this.realOffset(element);

     this.xcomp = x + offsetcache[0] - this.deltaX;

     this.ycomp = y + offsetcache[1] - this.deltaY;

     this.offset = this.cumulativeOffset(element);

     return (this.ycomp >= this.offset[1] &&

             this.ycomp <  this.offset[1] + element.offsetHeight &&

             this.xcomp >= this.offset[0] &&

             this.xcomp <  this.offset[0] + element.offsetWidth);

   },

   // within must be called directly before

   overlap: function(mode, element) {

     if (!mode) return 0;

     if (mode == 'vertical')

       return ((this.offset[1] + element.offsetHeight) - this.ycomp) /

         element.offsetHeight;

     if (mode == 'horizontal')

       return ((this.offset[0] + element.offsetWidth) - this.xcomp) /

         element.offsetWidth;

   },

   page: function(forElement) {

     var valueT = 0, valueL = 0;

     var element = forElement;

     do {

       valueT += element.offsetTop  || 0;

       valueL += element.offsetLeft || 0;

       // Safari fix

       if (element.offsetParent==document.body)

         if (Element.getStyle(element,'position')=='absolute') break;

     } while (element = element.offsetParent);

     element = forElement;

     do {

       if (!window.opera || element.tagName=='BODY') {

         valueT -= element.scrollTop  || 0;

         valueL -= element.scrollLeft || 0;

       }

     } while (element = element.parentNode);

     return [valueL, valueT];

   },

   clone: function(source, target) {

     var options = Object.extend({

       setLeft:    true,

       setTop:     true,

       setWidth:   true,

       setHeight:  true,

       offsetTop:  0,

       offsetLeft: 0

     }, arguments[2] || {})

     // find page position of source

     source = $(source);

     var p = Position.page(source);

     // find coordinate system to use

     target = $(target);

     var delta = [0, 0];

     var parent = null;

     // delta [0,0] will do fine with position: fixed elements,

     // position:absolute needs offsetParent deltas

     if (Element.getStyle(target,'position') == 'absolute') {

       parent = Position.offsetParent(target);

       delta = Position.page(parent);

     }

     // correct by body offsets (fixes Safari)

     if (parent == document.body) {

       delta[0] -= document.body.offsetLeft;

       delta[1] -= document.body.offsetTop;

     }

     // set position

     if(options.setLeft)   target.style.left  = (p[0] - delta[0] + options.offsetLeft) + 'px';

     if(options.setTop)    target.style.top   = (p[1] - delta[1] + options.offsetTop) + 'px';

     if(options.setWidth)  target.style.width = source.offsetWidth + 'px';

     if(options.setHeight) target.style.height = source.offsetHeight + 'px';

   },

   absolutize: function(element) {

     element = $(element);

     if (element.style.position == 'absolute') return;

     Position.prepare();

     var offsets = Position.positionedOffset(element);

     var top     = offsets[1];

     var left    = offsets[0];

     var width   = element.clientWidth;

     var height  = element.clientHeight;

     element._originalLeft   = left - parseFloat(element.style.left  || 0);

     element._originalTop    = top  - parseFloat(element.style.top || 0);

     element._originalWidth  = element.style.width;

     element._originalHeight = element.style.height;

     element.style.position = 'absolute';

     element.style.top    = top + 'px';

     element.style.left   = left + 'px';

     element.style.width  = width + 'px';

     element.style.height = height + 'px';

   },

   relativize: function(element) {

     element = $(element);

     if (element.style.position == 'relative') return;

     Position.prepare();

     element.style.position = 'relative';

     var top  = parseFloat(element.style.top  || 0) - (element._originalTop || 0);

     var left = parseFloat(element.style.left || 0) - (element._originalLeft || 0);

     element.style.top    = top + 'px';

     element.style.left   = left + 'px';

     element.style.height = element._originalHeight;

     element.style.width  = element._originalWidth;

   }

 }

 // Safari returns margins on body which is incorrect if the child is absolutely

 // positioned.  For performance reasons, redefine Position.cumulativeOffset for

 // KHTML/WebKit only.

 if (/Konqueror|Safari|KHTML/.test(navigator.userAgent)) {

   Position.cumulativeOffset = function(element) {

     var valueT = 0, valueL = 0;

     do {

       valueT += element.offsetTop  || 0;

       valueL += element.offsetLeft || 0;

       if (element.offsetParent == document.body)

         if (Element.getStyle(element, 'position') == 'absolute') break;

       element = element.offsetParent;

     } while (element);

     return [valueL, valueT];

   }

 }

 Element.addMethods();

 // ------------------------------------------------------------------------

 // ------------------------------------------------------------------------

 // The rest of this file is the actual ray tracer written by Adam

 // Burmister. It's a concatenation of the following files:

 //

 //   flog/color.js

 //   flog/light.js

 //   flog/vector.js

 //   flog/ray.js

 //   flog/scene.js

 //   flog/material/basematerial.js

 //   flog/material/solid.js

 //   flog/material/chessboard.js

 //   flog/shape/baseshape.js

 //   flog/shape/sphere.js

 //   flog/shape/plane.js

 //   flog/intersectioninfo.js

 //   flog/camera.js

 //   flog/background.js

 //   flog/engine.js

 /* Fake a Flog.* namespace */

 if(typeof(Flog) == 'undefined') var Flog = {};

 if(typeof(Flog.RayTracer) == 'undefined') Flog.RayTracer = {};

 Flog.RayTracer.Color = Class.create();

 Flog.RayTracer.Color.prototype = {

     red : 0.0,

     green : 0.0,

     blue : 0.0,

     initialize : function(r, g, b) {

         if(!r) r = 0.0;

         if(!g) g = 0.0;

         if(!b) b = 0.0;

         this.red = r;

         this.green = g;

         this.blue = b;

     },

     add : function(c1, c2){

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red + c2.red;

         result.green = c1.green + c2.green;

         result.blue = c1.blue + c2.blue;

         return result;

     },

     addScalar: function(c1, s){

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red + s;

         result.green = c1.green + s;

         result.blue = c1.blue + s;

         result.limit();

         return result;

     },

     subtract: function(c1, c2){

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red - c2.red;

         result.green = c1.green - c2.green;

         result.blue = c1.blue - c2.blue;

         return result;

     },

     multiply : function(c1, c2) {

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red * c2.red;

         result.green = c1.green * c2.green;

         result.blue = c1.blue * c2.blue;

         return result;

     },

     multiplyScalar : function(c1, f) {

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red * f;

         result.green = c1.green * f;

         result.blue = c1.blue * f;

         return result;

     },

     divideFactor : function(c1, f) {

         var result = new Flog.RayTracer.Color(0,0,0);

         result.red = c1.red / f;

         result.green = c1.green / f;

         result.blue = c1.blue / f;