//browse set
var XMLHTTPREQUEST_MS_PROGIDS = new Array(
  "Msxml2.XMLHTTP.8.0",
  "Msxml2.XMLHTTP.7.0",
  "Msxml2.XMLHTTP.6.0",
  "Msxml2.XMLHTTP.5.0",
  "Msxml2.XMLHTTP.4.0",
  "Msxml2.XMLHTTP.3.0",
  "Msxml2.XMLHTTP",
  "MSXML.XMLHTTP",
  "Microsoft.XMLHTTP"
);

// Define ready state constants.

var XMLHTTPREQUEST_READY_STATE_UNINITIALIZED = 0;
var XMLHTTPREQUEST_READY_STATE_LOADING       = 1;
var XMLHTTPREQUEST_READY_STATE_LOADED        = 2;
var XMLHTTPREQUEST_READY_STATE_INTERACTIVE   = 3;
var XMLHTTPREQUEST_READY_STATE_COMPLETED     = 4;

//create Ajax Object
function createAjaxObj(){
	var httpRequest = null;

	if (window.XMLHttpRequest != null)	httpRequest = new window.XMLHttpRequest();
	else if (window.ActiveXObject != null){
		var success = false;
		for (var i = 0; i < XMLHTTPREQUEST_MS_PROGIDS.length && !success; i++){
		  try  {
			httpRequest = new ActiveXObject(XMLHTTPREQUEST_MS_PROGIDS[i]);
			success = true;
		  } 
		  catch (ex) {}
		}
	  }
	if (httpRequest == null) alert("Error in HttpRequest():\n\n" + "Cannot create an XMLHttpRequest object.");
	return httpRequest;
}