function ajax(div,url)
	{ 
	document.getElementById(div).innerHTML = "loading...";
	var req = null; 
	req = (window.XMLHttpRequest) ? new XMLHttpRequest(): new ActiveXObject(Msxml2.XMLHTTP);
	req.onreadystatechange = function() { 
		if((req.readyState == 4)&&(req.status == 200)) document.getElementById(div).innerHTML = req.responseText;	
		}
	var data = null;
	req.open("POST", "sources/"+url, true); 
	req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
	req.send(data); 
	}