// JScript source code
var xmlHttp

function checkuser(str)
{ 
xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  //alert ("Your browser does not support AJAX!");
  return;
  } 
var url="checkuser.asp";
url=url+"?uname="+str;
url=url+"&sid="+Math.random();
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
}

function stateChanged() 
{ 
if (xmlHttp.readyState==4)
{ 
//document.getElementById("txtHint").innerHTML=xmlHttp.responseText;
if(xmlHttp.responseText=="y")
{
alert("User Name "+document.forms[0].uname.value+" already exist. Please select another User Name");
document.forms[0].uname.select();
document.forms[0].uname.focus();
}
}
}

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;
}