// AJAX  handlervar ajax = {  poll: true,  _first: true,  _pollEvent: function(first) {},  _handlers: new Array(),    _messages:0,  _messageQueue: '',  _queueMessages: false,      _xhr: function(method,uri,body,handler)  {  	var req=null;  	    if (window.XMLHttpRequest) { // Non-IE browsers      	req = new XMLHttpRequest();	}	else if (window.ActiveXObject) { // IE      	req = new ActiveXObject("Microsoft.XMLHTTP");	}	    req.onreadystatechange=function()    {    	if (req.readyState==4)     	{    		try    		{    	    	handler(req);    		}    		catch(e)    		{    		    window.status="ERROR: xhr "+e.name + ": " + e.message;    			// alert(e.name+" "+e.message);    		}    	}    }	    if (body!=null)    {       req.open(method,uri,true);       req.setRequestHeader('Content-Type','application/x-www-form-urlencoded');	   req.send(body);    }    else    {	   req.open(method,uri,true);       req.send(null);    }  },    _messageHandler: function(request)   {    var qm=ajax._queueMessages;    ajax._queueMessages=true;    try    {      if (request.status == 200)      {        var response = request.responseXML.getElementsByTagName("ajax-response");        if (response != null && response.length == 1)        {          var responses = response[0].getElementsByTagName("response");	            for ( var i = 0 ; i < responses.length ; i++ )           {            var responseElement = responses[i];	                // only process nodes of type element.....            if ( responseElement.nodeType != 1 )              continue;            var id   = responseElement.getAttribute('id');                        var handler = ajax._handlers[id];	    	    if (handler!=null)            {              for (var j = 0; j < responseElement.childNodes.length; j++)               {                var child = responseElement.childNodes[j]                if (child.nodeType == 1)                 {                  handler(child);                }              }            }          }        }      }    }    catch(e)    {    	window.status="ERROR: _messageHandler "+e.name + ": " + e.message;      // alert(e.name + ": " + e.message);    }    ajax._queueMessages=qm;        if (!ajax._queueMessages && ajax._messages>0)    {      var body = ajax._messageQueue;      ajax._messageQueue='';      ajax._messages=0;            ajax._xhr('POST','.',body,ajax._pollHandler);          }  },    _pollHandler: function(request)   {    if (request.status != 200)      return;          ajax._queueMessages=true;    try    {      ajax._messageHandler(request);      ajax._pollEvent(ajax._first);      ajax._first=false;    }    catch(e)    {    	window.status="ERROR: pollHandler "+e.name + ": " + e.message;      // alert(e.name + ": " + e.message);    }        ajax._queueMessages=false;        if (ajax._messages==0)    {      if (ajax.poll)        ajax._xhr('POST','.?ajax=poll&message=poll',null,ajax._pollHandler);    }    else    {      var body = ajax._messageQueue+'&ajax=poll&message=poll';      ajax._messageQueue='';      ajax._messages=0;      ajax._xhr('POST','.',body,ajax._pollHandler);    }  },    addPollHandler : function(func)  {    var old = ajax._pollEvent;    ajax._pollEvent = function(first)     {      old(first);      func(first);    }  },    // Listen on a channel or topic.   handler must be a function taking a message arguement  addListener : function(id,handler)  {       ajax._handlers[id]=handler;  },    // remove Listener from channel or topic.    removeListener : function(id)  {       ajax._handlers[id]=null;  },    sendMessage : function(destination,message)  {    message=message.replace('%','%25');    message=message.replace('&','%26');    message=message.replace('=','%3D');    if (ajax._queueMessages)    {      ajax._messageQueue+=(ajax._messages==0?'ajax=':'&ajax=')+destination+'&message='+message;      ajax._messages++;    }    else    {      ajax._xhr('POST','.','ajax='+destination+'&message='+message,ajax._messageHandler);    }  },    _startPolling : function()  {    if (ajax.poll)      ajax._xhr('POST','.?ajax=poll&message=poll&timeout=0',null,ajax._pollHandler);  },    getContentAsString: function( parentNode ) {      return parentNode.xml != undefined ?         ajax._getContentAsStringIE(parentNode) :         ajax._getContentAsStringMozilla(parentNode);  },  _getContentAsStringIE: function(parentNode) {     var contentStr = "";     for ( var i = 0 ; i < parentNode.childNodes.length ; i++ ) {         var n = parentNode.childNodes[i];         if (n.nodeType == 4) {             contentStr += n.nodeValue;         }         else {           contentStr += n.xml;       }     }     return contentStr;  },  _getContentAsStringMozilla: function(parentNode) {     var xmlSerializer = new XMLSerializer();     var contentStr = "";     for ( var i = 0 ; i < parentNode.childNodes.length ; i++ ) {          var n = parentNode.childNodes[i];          if (n.nodeType == 4) { // CDATA node              contentStr += n.nodeValue;          }          else {            contentStr += xmlSerializer.serializeToString(n);        }     }     return contentStr;  }  };var EvUtil ={    getKeyCode : function(ev)    {        var keyc;        if (window.event)            keyc=window.event.keyCode;        else            keyc=ev.keyCode;        return keyc;    }};Behaviour.addLoadEvent(ajax._startPolling);