var xmlHttpRequestHandler = new Object();
xmlHttpRequestHandler.createXmlHttpRequest = function(){

  var XmlHttpRequestObject;
  if (typeof XMLHttpRequest != "undefined"){
   XmlHttpRequestObject = new XMLHttpRequest();
  }
  else if (window.ActiveXObject){
   // look up the highest possible MSXML version
   var tryPossibleVersions=["MSXML2.XMLHttp.5.0",
                          "MSXML2.XMLHttp.4.0",
                          "MSXML2.XMLHttp.3.0",
                          "MSXML2.XMLHttp",
                          "Microsoft.XMLHttp"];

  for (i=0; i< tryPossibleVersions.length; i++){
   try{
      XmlHttpRequestObject = new ActiveXObject(tryPossibleVersions[i]);
      break;
   }
   catch (xmlHttpRequestObjectError){
      //ignore
   }
  }
 }
 return XmlHttpRequestObject;
}