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");
		}
    }
	return xmlHttp;
}