Hey All, Sorry for reposting(Admins, please delete the other one!). since you guys have been a great help, I was kinda hoping that you could help me once again while having the following question: I am currently trying to work with AJAX by allowing a managerclass in PHP to communicate via an XmlHttpobject with the javascript on the clientside. However, I can send something to the client via JSON, but I cannot read it at the clientside. In fact I am getting the error that the "time" is an undefined index in Session. So I was wondering: what am I doing wrong?

The javascriptcode for Ajax:

<script type="text/javascript">
    		var sendReq = GetXmlHttpObject();
    		var receiveReq = GetXmlHttpObject();
    		var JSONIn = 0;
    		var JSONOut= 0;
    		//var mTimer;	
//function to retreive xmlHTTp object for AJAX calls (correct)
function GetXmlHttpObject()
{
    var xmlHttp=null;
    try
     {
    	 // Firefox, Opera 8.0+, Safari
    	 xmlHttp=new XMLHttpRequest();
     }
    catch (e)
     {
    	 // Internet Explorer
     	try
      	{
      	xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      	}
     	catch (e)
      	{
      		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      	}
     }
    return xmlHttp;
}

    		//Gets the new info from the server
    		function getUpdate() {
    			if (receiveReq.readyState == 4 || receiveReq.readyState == 0) {
    				receiveReq.open("GET", "index.php?json="+JSONIn+"&sid=$this->session", true);
    				receiveReq.onreadystatechange = updateState; 
    				receiveReq.send(null);
    			}			
    		}
    		//send a message to the  server.
    		function sendUpdate(JSONstringsend) {
    			JSONOut=JSONstringsend;
    			if (sendReq.readyState == 4 || sendReq.readyState == 0) {
    				sendReq.open("POST", "index.php?json="+JSONstringsend+"&sid=$this->session", true);
    				sendReq.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
    				alert(JSONstringsend);
    				sendReq.onreadystatechange = updateCycle;
    				sendReq.send(JSONstringsend);
    			}							
    		}
    		//When data has been send, update the page.
    		function updateCycle() {
    			getUpdate();
    		}
    		function updateState() {
    			if (receiveReq.readyState == 4) {
    				// JSONANSWER gets here (correct):
    				var JSONtext = sendReq.responseText;
    				// convert received string to JavaScript object (correct)
    				alert(JSONtext);
    				var JSONobject = JSON.parse(JSONtext);
    			 	//   updates date from the JSONanswer (correct):
    				 document.getElementById("dateview").innerHTML=	JSONobject.date;		

    				}
    				//mTimer = setTimeout('getUpdate();',2000); //Refresh our chat in 2 seconds
    			}
    </script>

The function that actually uses the ajax code:

//datepickerdata
    	$(document).ready(function(){
    			$("#datepicker").datepicker({
    				onSelect: function(dateText){
    				var JSONObject = {"date": dateText};
    				var JSONstring = JSON.stringify(JSONObject);
    				sendUpdate(JSONstring);
    				},  
    			    dateFormat: 'dd-mm-yy' 
    		});

    	});

    	</script>

And the PHP code:

private function handleReceivedJSon($json){
	$this->jsonLocal=array();
	$json=$_POST["json"];
	$this->jsonDecoded= json_decode($json, true);
	if(isset($this->jsonDecoded["date"])){
		$_SESSION["date"]=$this->jsonDecoded["date"];
		$this->useddate=$this->jsonDecoded;

	}
	if(isset($this->jsonDecoded["logout"])){
		session_destroy();
		exit("logout");
	}
	header("Last-Modified: " . gmdate( "D, d M Y H:i:s" ) . "GMT" ); 
	header("Cache-Control: no-cache, must-revalidate" ); 
	header("Pragma: no-cache" );
	header("Content-Type: text/xml; charset=utf-8");
	exit($json);
}