var http_request = false;
	var isEmailExist;
	function checkemailidDuplication()
	{   		
		SetBrowser();		
		var EmailId;
		isEmailExist=0;
		EmailId=document.getElementById('email').value;		
		url="SubscriptionEmailCheck.php?EmailID="+EmailId;			
		http_request.open("GET",url,false);
		if (window.ActiveXObject)
		{	
			http_request.onreadystatechange=ChangeEmailstate;
		}
		else
		{
		  http_request.onreadystatechange=ChangeEmailstate();
		 }
		if (window.ActiveXObject)
		{
			http_request.send(null);		
		}
		else
		{
      		http_request.send(null);
			if (http_request.onreadystatechange == null)
			ChangeEmailstate();
		}
		
		if(isEmailExist==0)
		{			
			alert("This Email ID "+EmailId+" already exists");
			document.getElementById('email').value="";
			document.getElementById('email').focus();
			validatestatus="F";
			return false;
		}
		else
		{
			validatestatus="T";
			return true;
		}
	}
	function ChangeEmailstate()
	{
		if(http_request.readyState==4)
		{			
			isEmailExist=http_request.responseText;
		}
		else
		{
			isEmailExist=0;
		}
	}
	
	function SetBrowser()
	{
		try
    		{    // Firefox, Opera 8.0+, Safari    
          			http_request=new XMLHttpRequest();    
   			}
    	catch (e)
          		{    // Internet Explorer    
            		try
                  	{      
                    	http_request=new ActiveXObject("Msxml2.XMLHTTP");      
                  	}
            		catch (e)
                  	{      
                    	try
                      	{        
                            http_request=new ActiveXObject("Microsoft.XMLHTTP");        
                    	}
                    	catch (e)
                      	{        
                            alert("Your browser does not support AJAX!");        
                            return false;        
                      	}      
                  	}    
          		}  
	}