function checkemailexist(field)
	{ 
	   var xmlHttp;
	   
	   var url	= "chkemail.php?type=bronze&id="+field.value+"&sid="+Math.random();
	   
	   try
	   {
	     xmlHttp	= new XMLHttpRequest();
	   }
	   catch(e)
	   {
			 try
			 {
			  xmlHttp	= new ActiveXObject("Msxml2.XMLHTTP");
			 }
			 catch(e)
			 {
				  try
				  {
				   xmlHttp	= new ActiveXObject("Microsoft.XMLHTTP");
				  }
				  catch(e)
				  {
				  }
		     }
	    }
		
		xmlHttp.onreadystatechange= function()
		{
		  if(xmlHttp.readyState==4)
		  {
		    var cnt	= xmlHttp.responseText;
			if(parseInt(cnt)>0)
			{
			  alert("A user with this email id already exists.\nPlease login if you already registered.");
			  field.focus();
			  field.value="";
			  
			}  
		  }
		 }
		 xmlHttp.open("GET",url, true);
		 xmlHttp.send(null); 	  	 	     
		 	 
	}