function XmlHTTP() {
    var obj = null;
    try {
      obj = new ActiveXObject("Msxml2.XMLHTTP");
    } catch(e) {
      try {
        obj = new ActiveXObject("Microsoft.XMLHTTP");
      } catch(oc){
        obj = null;
      }
    }
    if(!obj&&typeof XMLHttpRequest!= "undefined") {
      obj = new XMLHttpRequest();
    }
    return obj;
}