// JavaScript Document
var xmlHttp;

function showHint(str)
{
if (str.length==0)
  { 
  document.getElementById("txtHint").innerHTML="";
  return;
  }
 xmlHttp=GetXmlHttpObject();
if (xmlHttp==null)
  {
  alert ("Browser does not support HTTP Request");
  return;
  } 
var url="emailvalid.php";
url=url+"?q="+str;
xmlHttp.onreadystatechange=stateChanged;
xmlHttp.open("GET",url,true);
xmlHttp.send(null);
} 

function stateChanged() 
{

if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 if(xmlHttp.status==200)
 {
 var str='go ahead';
 var val=document.getElementById("txtHint").innerHTML;
 val=xmlHttp.responseText;
 var valobj=document.getElementById("txtHint");
//str.match(text)
//alert();
//alert(val.length);
	
 if(val.length==339)
 {  
 	document.getElementById('txt1').select();
	alert("Mail Id Already Exists-Enter new one");
	
 }
  } 
 }
}

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;
}