Untitled

        var req = new XMLHttpRequest();
        req.open('GET', Config.svcUrl + '?' + urlData, true);
        var that = this;
        req.onreadystatechange = function (aEvt) {
            if (req.readyState == 4) {
                if (req.status == 200) {
                    alert(req.responseText);
                } else {
                    alert("Error loading page");
                }
            }
        };
        req.send(null);