AJAX bliver ved med at returnere readyState=0

Hey,

Jeg sidder og roder med et lille chat-script jeg skal have lavet mig - men AJAX tager lidt af mig!

WWW: http://rapsac.net/rChat/
java script: http://rapsac.net/rChat/httpRequest.js

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var xmlHttp;

function GetXmlHttpObject(){
    xmlHttp = null;
    try{
        //FIREFOX, OPERA, SAFARI
        xmlHttp = new XMLHttpRequest();
    }
    catch(e){
        try{
            //INTERNET EXPLORER
            xmlHttp = new ActiveXObject('Msxml2.XMLHTTP');
        }
        catch(e){
            try{
                xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
            }
            catch(e){
                alert('Your browser does not support AJAX!  The unit cost field will not automatically update depending on your expense category selection.  Please enter this information manually.');
                return false;
            }
        }
    }
    return xmlHttp;
}

function stateChanged(){
    alert("In statChanged");
    if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
        var val;
        val = xmlHttp.responseText;
        alert("We are now in!");
    }
    alert("State:" + xmlHttp.readyState);
}

function loadURL(){
   
    xmlHttp = GetXmlHttpObject();
    if(xmlHttp == null){
        alert("Your browser is outdated and does not support AJAX.");
        return;
    }
    var url = "testfile.php";
    alert(url);
    xmlHttp.onreadystatechange = stateChanged();
    xmlHttp.open("GET", url, true);
    xmlHttp.send(null);
}

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Som sagt returnerer den at stateChanged er lig 0 - HVORFOR?

/Rapsac