function checkform()
{
   /* Check for a validly formed email address. */
   var eaddr = document.myform.email.value;
   if ( eaddr.search(/[\w\-]+\@[\w\-]+\.\w+/i) == -1 )
     {
         alert ("Invalid email address:\n   " + eaddr +
                "\nEmail address must contain an '@' sign.");
         document.myform.email.focus();
         return (false);
     }
   return (true);
}