var xmlHttp


function validateUser(userId)
{
	xmlHttp=GetXmlHttpObject()
	if (xmlHttp==null)
	{
	alert ("Your browser does not support AJAX!");
	return;
	} 
	var url="util.php?userId=";
	url=url+userId;
	//alert(url);
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("GET",url,true);
	
	xmlHttp.send(null);
} 

function stateChanged() 
{ 
	
if (xmlHttp.readyState==4)
{
	//alert(document.getElementById(divId).innerHTML);
	alert(xmlHttp.responseText);
	return xmlHttp.responseText;
	
}
}

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;
}