function valid()
{
if(document.getElementById("email").value=="")	
		  {
			document.getElementById("email1").innerHTML="Please enter the Email Id";
			return false;
		  }
		  else
		  {
			document.getElementById("email1").innerHTML='';
		  }
		  if(document.getElementById('email').value!="")
				{
					var x = document.getElementById('email').value;
					var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
					if (filter.test(x))
					{
						 document.getElementById('email1').innerHTML="";
					}
					else
					{
					  document.getElementById('email1').innerHTML="Invalid Email Id";
					  return false;
					}
	}
}