function ajaxInit(){
    var xmlhttp;
    try {
        xmlhttp = new XMLHttpRequest();
    }catch(ee){
        try{
            xmlhttp = new ActiveXObject("Msxm12.XMLHTTP");
        }catch(e){
            try{
                xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
            }catch(E){
                xmlhttp = false;
            }
        }
    }
    return xmlhttp;
}