function GetXmlHttpObject() {
	var xmlHttp=null;
	if (window.XMLHttpRequest) {
		// code for IE7+, Firefox, Chrome, Opera, Safari
		xmlHttp=new XMLHttpRequest();
	}
	if (window.ActiveXObject) {
		// code for IE6, IE5
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
	return xmlHttp;
}