function createXMLHttpRequest() {
	
    try{
		req = new XMLHttpRequest();
	}
	catch (e){
		try{
			req = new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e){
			try{
				req = new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (failed){
				req = null;
			}
		}
	}
	
	return req;
}