function  valid()
{
if(document.me.email.value=="")
 {
 alert("Enter the email")
 document.me.email.focus();
 return false;
 }
if(document.me.email.value != "")
		{
             if ((document.me.email.value.indexOf('@') < 0) || 
			((document.me.email.value.charAt(document.me.email.value.length-4) 
			!= '.') &&
			(document.me.email.value.charAt(document.me.email.value.length-3) 
			!= '.')))

               {alert("Invalid email address. Please write again.");
               document.me.email.focus();
                return false;
               }
        }
}// JavaScript Document