var xmlHttp_check_upload;

function check_upload(){

	str = document.getElementById("user_title").value;
	if(!str)return;
	
xmlHttp_check_upload=GetXmlHttpObject_check_upload();
if (xmlHttp_check_upload==null)
  {
  alert ("Your browser does not support AJAX!");
  return;
  } 
var url="http://www.oldstockcars.com/vfsn/check_upload.php";
url=url+"?q="+str;
url=url+"&sid="+Math.random();
xmlHttp_check_upload.onreadystatechange=stateChanged_check_upload;
xmlHttp_check_upload.open("GET",url,true);
xmlHttp_check_upload.send(null);
} 

function stateChanged_check_upload() 
{ 
if (xmlHttp_check_upload.readyState==4)
{ 
		alert(xmlHttp_check_upload.responseText);
		//if(xmlHttp_check_login.responseText=="Username could not be found! Please check spelling or register to continue."){
			//document.getElementById("username").value = "";
			//document.getElementById("username").focus();
		//}
}
}

function GetXmlHttpObject_check_upload()
{
var xmlHttp_check_upload=null;
try
  {
  // Firefox, Opera 8.0+, Safari
  xmlHttp_check_upload=new XMLHttpRequest();
  }
catch (e)
  {
  // Internet Explorer
  try
    {
    xmlHttp_check_upload=new ActiveXObject("Msxml2.XMLHTTP");
    }
  catch (e)
    {
    xmlHttp_check_upload=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
return xmlHttp_check_upload;
}