/*  Prototype JavaScript framework, version 1.4.0
*  (c) 2005 Sam Stephenson <sam@conio.net>
*
*  Prototype is freely distributable under the terms of an MIT-style license.
*  For details, see the Prototype web site: http://prototype.conio.net/
*
*--------------------------------------------------------------------------*/

/* added following statements in Ajax.Request.request method. (Anil)

if (is_dev_env && !is_ie && is_ns) {
   try {
      netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
      } catch (e) {
      alert("Permission UniversalBrowserRead denied.");
   }
}

Changed "request: function(url)" method to send parameters in case
of post as well:

Original:
if (this.options.method == 'get' && parameters.length > 0)
   this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;

Changed:
if (parameters.length > 0)
   this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;


*/
var Prototype = {
   Version: '1.4.0',
   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 (property in source) {
      destination[property] = source[property];
   }
   return destination;
}

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;
   }
}

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;
   return function(event) {
      return __method.call(object, event || window.event);
   }
}

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; i < arguments.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() {
      setInterval(this.onTimerEvent.bind(this), this.frequency * 1000);
   },
   
   onTimerEvent: function() {
      if (!this.currentlyExecuting) {
         try {
            this.currentlyExecuting = true;
            this.callback();
            } finally {
            this.currentlyExecuting = false;
         }
      }
   }
}

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

function $() {
   var elements = new Array();
   
   for (var i = 0; i < arguments.length; i++) {
      var element = arguments[i];
      if (typeof element == 'string')
         element = document.getElementById(element);
      
      if (arguments.length == 1)
         return element;
      
      elements.push(element);
   }
   
   return elements;
}
Object.extend(String.prototype, {
      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(eval);
      },
      
      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[0].nodeValue : '';
      },
      
      toQueryParams: function() {
         var pairs = this.match(/^\??(.*)$/)[1].split('&');
         return pairs.inject({}, function(params, pairString) {
               var pair = pairString.split('=');
               params[pair[0]] = pair[1];
               return params;
         });
      },
      
      toArray: function() {
         return this.split('');
      },
      
      camelize: function() {
         var oStringList = this.split('-');
         if (oStringList.length == 1) return oStringList[0];
         
         var camelizedString = this.indexOf('-') == 0
         ? oStringList[0].charAt(0).toUpperCase() + oStringList[0].substring(1)
         : oStringList[0];
         
         for (var i = 1, len = oStringList.length; i < len; i++) {
            var s = oStringList[i];
            camelizedString += s.charAt(0).toUpperCase() + s.substring(1);
         }
         
         return camelizedString;
      },
      
      inspect: function() {
         return "'" + this.replace('\\', '\\\\').replace("'", '\\\'') + "'";
      }
});

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

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;
      }
   },
   
   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 = true;
      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(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;
   },
   
   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.collect(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 (value >= (result || value))
               result = value;
      });
      return result;
   },
   
   min: function(iterator) {
      var result;
      this.each(function(value, index) {
            value = (iterator || Prototype.K)(value, index);
            if (value <= (result || value))
               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.collect(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.collect(Prototype.K);
   },
   
   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) {
            iterator(value = collections.pluck(index));
            return value;
      });
   },
   
   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; i < iterable.length; i++)
         results.push(iterable[i]);
      return results;
   }
}

Object.extend(Array.prototype, Enumerable);

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


Object.extend(Array.prototype, {
      _each: function(iterator) {
         for (var i = 0; i < this.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 != undefined || value != null;
         });
      },
      
      flatten: function() {
         return this.inject([], function(array, value) {
               return array.concat(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; i < this.length; i++)
            if (this[i] == object) return i;
         return -1;
      },
      
      reverse: function(inline) {
         return (inline !== false ? this : this.toArray())._reverse();
      },
      
      shift: function() {
         var result = this[0];
         for (var i = 0; i < this.length - 1; i++)
            this[i] = this[i + 1];
         this.length--;
         return result;
      },
      
      inspect: function() {
         return '[' + this.map(Object.inspect).join(', ') + ']';
      }
});

var Hash = {
   _each: function(iterator) {
      for (key in this) {
         var value = this[key];
         if (typeof value == 'function') 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 $H(hash).inject($H(this), function(mergedHash, pair) {
            mergedHash[pair.key] = pair.value;
            return mergedHash;
      });
   },
   
   toQueryString: function() {
      return this.map(function(pair) {
            return pair.map(encodeURIComponent).join('=');
      }).join('&');
   },
   
   inspect: function() {
      return '#<Hash:{' + this.map(function(pair) {
            return pair.map(Object.inspect).join(': ');
      }).join(', ') + '}>';
   }
}

function $H(object) {
   var hash = Object.extend({}, object || {});
   Object.extend(hash, Enumerable);
   Object.extend(hash, Hash);
   return hash;
}
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;
         do {
            iterator(value);
            value = value.succ();
         } while (this.include(value));
      },
      
      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 ActiveXObject('Msxml2.XMLHTTP')},
         function() {return new ActiveXObject('Microsoft.XMLHTTP')},
         function() {return new XMLHttpRequest()}
      ) || false;
   },
   
   activeRequestCount: 0
}

Ajax.Responders = {
   responders: [],
   
   _each: function(iterator) {
      this.responders._each(iterator);
   },
   
   register: function(responderToAdd) {
      if (!this.include(responderToAdd))
         this.responders.push(responderToAdd);
   },
   
   unregister: function(responderToRemove) {
      this.responders = this.responders.without(responderToRemove);
   },
   
   dispatch: function(callback, request, transport, json) {
      this.each(function(responder) {
            if (responder[callback] && 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,
         parameters:   ''
      }
      Object.extend(this.options, options || {});
   },
   
   responseIsSuccess: function() {
      return this.transport.status == undefined
      || this.transport.status == 0
      || (this.transport.status >= 200 && this.transport.status < 300);
   },
   
   responseIsFailure: function() {
      return !this.responseIsSuccess();
   }
}

Ajax.Request = Class.create();
Ajax.Request.Events =
['Uninitialized', 'Loading', 'Loaded', 'Interactive', 'Complete'];

Ajax.Request.prototype = Object.extend(new Ajax.Base(), {
      initialize: function(url, options) {
         this.transport = Ajax.getTransport();
         this.setOptions(options);
         this.request(url);
      },
      
      request: function(url) {
         var parameters = this.options.parameters || '';
         if (parameters.length > 0) parameters += '&_=';
         
         if (systemProps['is_dev_env'] && !is_ie && is_ns) {
            try {
               netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
               } catch (e) {
               alert("Permission UniversalBrowserRead denied.");
            }
         }
         
         
         try {
            this.url = url;
            if (parameters.length > 0)
               this.url += (this.url.match(/\?/) ? '&' : '?') + parameters;
            
            Ajax.Responders.dispatch('onCreate', this, this.transport);
            
            debugA("url request: " + this.url);
            
            this.transport.open(this.options.method, this.url,
            this.options.asynchronous);
            
            if (this.options.asynchronous) {
               this.transport.onreadystatechange = this.onStateChange.bind(this);
               setTimeout((function() {this.respondToReadyState(1)}).bind(this), 10);
            }
            
            this.setRequestHeaders();
            
            var body = this.options.postBody ? this.options.postBody : parameters;
            
            this.transport.send(this.options.method == 'post' ? body : null);
            
            } catch (e) {
            alert('Error in seding AJAX request: ' + e);
            this.dispatchException(e);
         }
      },
      
      setRequestHeaders: function() {
         var requestHeaders =
         ['X-Requested-With', 'XMLHttpRequest',
         'X-Prototype-Version', Prototype.Version];
         
         if (this.options.method == 'post') {
            requestHeaders.push('Content-type',
            'application/x-www-form-urlencoded');
            
            /* Force "Connection: close" for Mozilla browsers to work around
            * a bug where XMLHttpReqeuest sends an incorrect Content-length
            * header. See Mozilla Bugzilla #246651.
            */
            if (this.transport.overrideMimeType)
               requestHeaders.push('Connection', 'close');
         }
         
         if (this.options.requestHeaders)
            requestHeaders.push.apply(requestHeaders, this.options.requestHeaders);
         
         for (var i = 0; i < requestHeaders.length; i += 2)
            this.transport.setRequestHeader(requestHeaders[i], requestHeaders[i+1]);
      },
      
      onStateChange: function() {
         var readyState = this.transport.readyState;
         if (readyState != 1)
            this.respondToReadyState(this.transport.readyState);
      },
      
      header: function(name) {
         try {
            return this.transport.getResponseHeader(name);
         } catch (e) {}
      },
      
      evalJSON: function() {
         try {
            return eval(this.header('X-JSON'));
         } catch (e) {}
      },
      
      evalResponse: function() {
         try {
            return eval(this.transport.responseText);
            } catch (e) {
            this.dispatchException(e);
         }
      },
      
      respondToReadyState: function(readyState) {
         var event = Ajax.Request.Events[readyState];
         var transport = this.transport, json = this.evalJSON();
         if (event == 'Complete') {
            try {
               (this.options['on' + this.transport.status]
                  || this.options['on' + (this.responseIsSuccess() ? 'Success' : 'Failure')]
               || Prototype.emptyFunction)(transport, json);
               } catch (e) {
               this.dispatchException(e);
            }
            
            if ((this.header('Content-type') || '').match(/^text\/javascript/i))
               this.evalResponse();
         }
         
         try {
            (this.options['on' + event] || Prototype.emptyFunction)(transport, json);
            Ajax.Responders.dispatch('on' + event, this, transport, json);
            } catch (e) {
            this.dispatchException(e);
         }
         
         /* Avoid memory leak in MSIE: clean up the oncomplete event handler */
         if (event == 'Complete')
            this.transport.onreadystatechange = Prototype.emptyFunction;
      },
      
      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.containers = {
            success: container.success ? $(container.success) : $(container),
            failure: 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, object) {
               this.updateContent();
               onComplete(transport, object);
         }).bind(this);
         
         this.request(url);
      },
      
      updateContent: function() {
         var receiver = this.responseIsSuccess() ?
         this.containers.success : this.containers.failure;
         var response = this.transport.responseText;
         
         if (!this.options.evalScripts)
            response = response.stripScripts();
         
         if (receiver) {
            if (this.options.insertion) {
               new this.options.insertion(receiver, response);
               } else {
               Element.update(receiver, response);
            }
         }
         
         if (this.responseIsSuccess()) {
            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.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);
      }
});
document.getElementsByClassName = function(className, parentElement) {
   var children = ($(parentElement) || document.body).getElementsByTagName('*');
   return $A(children).inject([], function(elements, child) {
         if (child.className.match(new RegExp("(^|\\s)" + className + "(\\s|$)")))
            elements.push(child);
         return elements;
   });
}

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

if (!window.Element) {
   var Element = new Object();
}

Object.extend(Element, {
      visible: function(element) {
         return $(element).style.display != 'none';
      },
      
      toggle: function() {
         for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            Element[Element.visible(element) ? 'hide' : 'show'](element);
         }
      },
      
      hide: function() {
         for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            element.style.display = 'none';
         }
      },
      
      show: function() {
         for (var i = 0; i < arguments.length; i++) {
            var element = $(arguments[i]);
            element.style.display = '';
         }
      },
      
      remove: function(element) {
         element = $(element);
         element.parentNode.removeChild(element);
      },
      
      update: function(element, html) {
         $(element).innerHTML = html.stripScripts();
         setTimeout(function() {html.evalScripts()}, 10);
      },
      
      getHeight: function(element) {
         element = $(element);
         return element.offsetHeight;
      },
      
      classNames: function(element) {
         return new Element.ClassNames(element);
      },
      
      hasClassName: function(element, className) {
         if (!(element = $(element))) return;
         return Element.classNames(element).include(className);
      },
      
      addClassName: function(element, className) {
         if (!(element = $(element))) return;
         return Element.classNames(element).add(className);
      },
      
      removeClassName: function(element, className) {
         if (!(element = $(element))) return;
         return Element.classNames(element).remove(className);
      },
      
      // removes whitespace-only text node children
      cleanWhitespace: function(element) {
         element = $(element);
         for (var i = 0; i < element.childNodes.length; i++) {
            var node = element.childNodes[i];
            if (node.nodeType == 3 && !/\S/.test(node.nodeValue))
               Element.remove(node);
         }
      },
      
      empty: function(element) {
         return $(element).innerHTML.match(/^\s*$/);
      },
      
      scrollTo: function(element) {
         element = $(element);
         var x = element.x ? element.x : element.offsetLeft,
         y = element.y ? element.y : element.offsetTop;
         window.scrollTo(x, y);
      },
      
      getStyle: function(element, style) {
         element = $(element);
         var value = element.style[style.camelize()];
         if (!value) {
            if (document.defaultView && document.defaultView.getComputedStyle) {
               var css = document.defaultView.getComputedStyle(element, null);
               value = css ? css.getPropertyValue(style) : null;
               } else if (element.currentStyle) {
               value = element.currentStyle[style.camelize()];
            }
         }
         
         if (window.opera && ['left', 'top', 'right', 'bottom'].include(style))
            if (Element.getStyle(element, 'position') == 'static') value = 'auto';
         
         return value == 'auto' ? null : value;
      },
      
      setStyle: function(element, style) {
         element = $(element);
         for (name in style)
            element.style[name.camelize()] = style[name];
      },
      
      getDimensions: function(element) {
         element = $(element);
         if (Element.getStyle(element, 'display') != 'none')
            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;
         els.visibility = 'hidden';
         els.position = 'absolute';
         els.display = '';
         var originalWidth = element.clientWidth;
         var originalHeight = element.clientHeight;
         els.display = 'none';
         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;
            }
         }
      },
      
      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 = '';
         }
      },
      
      makeClipping: function(element) {
         element = $(element);
         if (element._overflow) return;
         element._overflow = element.style.overflow;
         if ((Element.getStyle(element, 'overflow') || 'visible') != 'hidden')
            element.style.overflow = 'hidden';
      },
      
      undoClipping: function(element) {
         element = $(element);
         if (element._overflow) return;
         element.style.overflow = element._overflow;
         element._overflow = undefined;
      }
});

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) {
            if (this.element.tagName.toLowerCase() == 'tbody') {
               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(this.toArray().concat(classNameToAdd).join(' '));
   },
   
   remove: function(classNameToRemove) {
      if (!this.include(classNameToRemove)) return;
      this.set(this.select(function(className) {
               return className != classNameToRemove;
      }).join(' '));
   },
   
   toString: function() {
      return this.toArray().join(' ');
   }
}

Object.extend(Element.ClassNames.prototype, Enumerable);
var Field = {
   clear: function() {
      for (var i = 0; i < arguments.length; i++)
         $(arguments[i]).value = '';
   },
   
   focus: function(element) {
      $(element).focus();
   },
   
   present: function() {
      for (var i = 0; i < arguments.length; i++)
         if ($(arguments[i]).value == '') return false;
      return true;
   },
   
   select: function(element) {
      $(element).select();
   },
   
   activate: function(element) {
      element = $(element);
      element.focus();
      if (element.select)
         element.select();
   }
}

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

var Form = {
   serialize: function(form) {
      var elements = Form.getElements($(form));
      var queryComponents = new Array();
      
      for (var i = 0; i < elements.length; i++) {
         var queryComponent = Form.Element.serialize(elements[i]);
         if (queryComponent)
            queryComponents.push(queryComponent);
      }
      
      return queryComponents.join('&');
   },
   
   getElements: function(form) {
      form = $(form);
      var elements = new Array();
      
      for (tagName in Form.Element.Serializers) {
         var tagElements = form.getElementsByTagName(tagName);
         for (var j = 0; j < tagElements.length; j++)
            elements.push(tagElements[j]);
      }
      return elements;
   },
   
   getInputs: function(form, typeName, name) {
      form = $(form);
      var inputs = form.getElementsByTagName('input');
      
      if (!typeName && !name)
         return inputs;
      
      var matchingInputs = new Array();
      for (var i = 0; i < inputs.length; i++) {
         var input = inputs[i];
         if ((typeName && input.type != typeName) ||
         (name && input.name != name))
         continue;
         matchingInputs.push(input);
      }
      
      return matchingInputs;
   },
   
   disable: function(form) {
      var elements = Form.getElements(form);
      for (var i = 0; i < elements.length; i++) {
         var element = elements[i];
         element.blur();
         element.disabled = 'true';
      }
   },
   
   enable: function(form) {
      var elements = Form.getElements(form);
      for (var i = 0; i < elements.length; i++) {
         var element = elements[i];
         element.disabled = '';
      }
   },
   
   findFirstElement: function(form) {
      return Form.getElements(form).find(function(element) {
            return element.type != 'hidden' && !element.disabled &&
            ['input', 'select', 'textarea'].include(element.tagName.toLowerCase());
      });
   },
   
   focusFirstElement: function(form) {
      Field.activate(Form.findFirstElement(form));
   },
   
   reset: function(form) {
      $(form).reset();
   }
}

Form.Element = {
   serialize: function(element) {
      element = $(element);
      var method = element.tagName.toLowerCase();
      var parameter = Form.Element.Serializers[method](element);
      
      if (parameter) {
         var key = encodeURIComponent(parameter[0]);
         if (key.length == 0) return;
         
         if (parameter[1].constructor != Array)
            parameter[1] = [parameter[1]];
         
         return parameter[1].map(function(value) {
               return key + '=' + encodeURIComponent(value);
         }).join('&');
      }
   },
   
   getValue: function(element) {
      element = $(element);
      var method = element.tagName.toLowerCase();
      var parameter = Form.Element.Serializers[method](element);
      
      if (parameter)
         return parameter[1];
   }
}

Form.Element.Serializers = {
   input: function(element) {
      switch (element.type.toLowerCase()) {
         case 'submit':
         case 'hidden':
         case 'password':
         case 'text':
            return Form.Element.Serializers.textarea(element);
         case 'checkbox':
         case 'radio':
            return Form.Element.Serializers.inputSelector(element);
      }
      return false;
   },
   
   inputSelector: function(element) {
      if (element.checked)
         return [element.name, element.value];
   },
   
   textarea: function(element) {
      return [element.name, element.value];
   },
   
   select: function(element) {
      return Form.Element.Serializers[element.type == 'select-one' ?
      'selectOne' : 'selectMany'](element);
   },
   
   selectOne: function(element) {
      var value = '', opt, index = element.selectedIndex;
      if (index >= 0) {
         opt = element.options[index];
         value = opt.value;
         if (!value && !('value' in opt))
            value = opt.text;
      }
      return [element.name, value];
   },
   
   selectMany: function(element) {
      var value = new Array();
      for (var i = 0; i < element.length; i++) {
         var opt = element.options[i];
         if (opt.selected) {
            var optValue = opt.value;
            if (!optValue && !('value' in opt))
               optValue = opt.text;
            value.push(optValue);
         }
      }
      return [element.name, value];
   }
}

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

var $F = Form.Element.getValue;

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

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();
      if (this.lastValue != value) {
         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() {
      var elements = Form.getElements(this.element);
      for (var i = 0; i < elements.length; i++)
         this.registerCallback(elements[i]);
   },
   
   registerCallback: function(element) {
      if (element.type) {
         switch (element.type.toLowerCase()) {
            case 'checkbox':
            case 'radio':
               Event.observe(element, 'click', this.onElementEvent.bind(this));
            break;
            case 'password':
            case 'text':
            case 'textarea':
            case 'select-one':
            case 'select-multiple':
               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,
      
      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; i < Event.observers.length; i++) {
            Event.stopObserving.apply(this, Event.observers[i]);
            Event.observers[i][0] = null;
         }
         Event.observers = false;
      },
      
      observe: function(element, name, observer, useCapture) {
         var element = $(element);
         useCapture = useCapture || false;
         
         if (name == 'keypress' &&
            (navigator.appVersion.match(/Konqueror|Safari|KHTML/)
         || element.attachEvent))
         name = 'keydown';
         
         this._observeAndCache(element, name, observer, useCapture);
      },
      
      stopObserving: function(element, name, observer, useCapture) {
         var 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) {
            element.detachEvent('on' + name, observer);
         }
      }
});

/* prevent memory leaks in IE */
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) {
            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;
   },
   
   clone: function(source, target) {
      source = $(source);
      target = $(target);
      target.style.position = 'absolute';
      var offsets = this.cumulativeOffset(source);
      target.style.top    = offsets[1] + 'px';
      target.style.left   = offsets[0] + 'px';
      target.style.width  = source.offsetWidth + 'px';
      target.style.height = source.offsetHeight + 'px';
   },
   
   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 {
         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];
   }
}