var reqXML;

function LoadXMLDoc(url) {
    if (window.XMLHttpRequest) { //Mozilla, Firefox, Opera 8.01, Safari
        reqXML = new XMLHttpRequest();
        reqXML.onreadystatechange = BuildXMLResults;
        reqXML.open("GET", url, true);
        reqXML.send(null);
    }
    else if (window.ActiveXObject) { //IE
        reqXML = new ActiveXObject("Microsoft.XMLHTTP");
        if (reqXML) {
            reqXML.onreadystatechange = BuildXMLResults;
            reqXML.open("GET", url, true);
            reqXML.send();
        }
    }
    else { //Older Browsers
        //alert("Your Browser does not support Ajax!");
    }
}

function BuildXMLResults() {
    if (reqXML.readyState == 4) 
    { //completed state
        if (reqXML.status == 200) 
        { //We got a sucess page back

		SetTimer();
            //Check to verify the message from the server 
            if (reqXML.responseText.indexOf("Session Updated - Server Time:") == 0) {
                window.status = reqXML.responseText; //display the message in the status bar
                SetTimer(); //restart timer
            }
            else {
                //display that that session expired
                //alert("Your session appears to have expired. You may loose your current data.");
            }
        }
        else {
            //display server code not be accessed
            //alert("There was a problem retrieving the XML data:\n" + reqXML.statusText);
        }
    }
    else
    {
      //alert("Not Ready");
    }
}

function ConfirmUpdate() {
    
     //alert("Validating that you are still a valid user"); 
    
     try
     {
        //load server side page if ok
       if (document && document.domain &&document.domain.indexOf("acxiom.co.nz") != -1)
       {         
         LoadXMLDoc('http://www.acxiom.co.nz/ValidateUser.aspx');
       }
       else
       {
         LoadXMLDoc('http://www.acxiom.com.au/ValidateUser.aspx'); 
       }
     }
     catch(err) {}
    
}

var timerObj;
function SetTimer() {
    //How long before timeout (should be a few minutes before your server's timeout
    var dblMinutes = 30;
    
    //set timer to call function to confirm update // setTimeout
    timerObj = setInterval("ConfirmUpdate()", 1000 * 60 * dblMinutes);   
}

//start the timer
SetTimer();