function GetXmlHttpObject(){
	var xmlHttp=null;
	try{
	  // Firefox, Opera 8.0+, Safari
	  xmlHttp=new XMLHttpRequest();
	}catch (e){
	  // Internet Explorer
		try{
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
	  	catch (e){
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
  
	if (xmlHttp==null){
		alert ("Your browser does not support AJAX!");
		return;
  	} 
	return xmlHttp;
}