var req;



function DoCallback(data)

{

     var url="check.php?"+data;

    //alert(url);

    // branch for native XMLHttpRequest object

    if (window.XMLHttpRequest) {

   

        req = new XMLHttpRequest();

        req.onreadystatechange = processReqChange;

        req.open('POST', url, true);

        req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

        req.send(data);

    // branch for IE/Windows ActiveX version

    } else if (window.ActiveXObject) {

        req = new ActiveXObject('Microsoft.XMLHTTP')

        if (req) {

            req.onreadystatechange = processReqChange;

            req.open('POST', url, true);

            req.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');

            req.send(data);

        }

    }

}



function processReqChange() {

    // only if req shows 'loaded'

    if (req.readyState == 4) {

        // only if 'OK'

        if (req.status == 200) {

            //eval(what);

            LoginStatus(req.responseText);

            //alert(what);

        } else {

            alert('There was a problem retrieving the XML data: ' +

                req.responseText);

        }

    }

}