function getXMLHttpObject() {
var xmlHttp = null;
try {  
	xmlHttp=new XMLHttpRequest();
}
catch (e) {  
	try {    
		xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");    
	}
 	catch (e) {
		try {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");      
		}
		catch (e) {}
	}  
}
return xmlHttp;
}