testXMLHttpRequest: function(){
            var xhr;
            try {
                xhr = new ActiveXObject('Msxml2.XMLHTTP');
            }catch (err2) {
                try {
                    xhr = new ActiveXObject('Microsoft.XMLHTTP');
                }catch (err3) {
                    try {
                        xhr = new XMLHttpRequest();
                    }
                    catch (err1)
                    {
                        return false;
                    }
                }
            }
            return xhr;
        },