function Ajax() {
        try {
                xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch (e) {

                try {
                        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                } catch (E) {
                        xmlhttp = false;
                }
        }
        if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
                xmlhttp = new XMLHttpRequest();
        }
        return xmlhttp
}