function XmlRequest(url,f){
	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){
				alert("Your browser does not support AJAX!");
			}
		}
	} 
	if (xmlHttp!=null){
		xmlHttp.onreadystatechange=function(){
			if(xmlHttp.readyState==4){
				f(xmlHttp.responseText);}
			}
	}
	xmlHttp.open("GET",url+"&ncache="+new Date().getTime());
	xmlHttp.send(null);
}