Core AJAX Call from Page

Javascript

function newXMLHttpRequest() {
    var xmlreq = false;
    if (window.XMLHttpRequest) {
        xmlreq = new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        // Try ActiveX
        try {
            xmlreq = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e1) {
            // first method failed 
            try {
                xmlreq = new ActiveXObject("Microsoft.XMLHTTP");
            } catch (e2) {
                // both methods failed 
            }
        }
    }
    return xmlreq;
}

function GetUserInfo(PageURL) {
    var req = newXMLHttpRequest();

    req.open("POST", PageURL, true);
    req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
    req.setRequestHeader("content-length", "0"); req.send('');

    req.onreadystatechange = function() {
        if (req.readyState == 4) {
            if (req.status == 200) {
                alert(req.responseText.toString());
            }
        }
    }
}