var xmlHttp1;

function checkUser(str){ 

document.getElementById("istatus").innerHTML= '<img src="images/loading.gif" width="16" height="16" />';

xmlHttp1=GetXmlHttpObject();
if (xmlHttp1==null)
 {
 alert ("Browser does not support HTTP Request");
 return;
 }
var url="checkid.php";
url=url+"?uid="+str;
url=url+"&sid="+Math.random();
xmlHttp1.onreadystatechange=stateChanged;
xmlHttp1.open("GET",url,true);
xmlHttp1.send(null);
}
function stateChanged() 
{ 
if (xmlHttp1.readyState==4 || xmlHttp1.readyState=="complete")
 { 
  document.getElementById("istatus").innerHTML= "";	
  document.getElementById("dlbluid").innerHTML= xmlHttp1.responseText;
 } 
}


function GetXmlHttpObject()
{
var xmlHttp1=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp1=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp1=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp1=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp1;
}