function GetXmlHttpObject(){
    var objXMLHttp=null;
    if (window.XMLHttpRequest){
        objXMLHttp=new XMLHttpRequest();
    }else if (window.ActiveXObject){
        try {
            objXMLHttp = new ActiveXObject("Msxml2.XMLHTTP");
        } catch(e) {
            try {
                objXMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
            } catch(e) {
            }
        }
    }
    return objXMLHttp;
}