function is_not_return_key(myfield,e)
{
  // Using this in a form's onkeypress prevents the return key
  // from submitting the form.
  if (window.event)
  {
    if (window.event.keyCode == 13)
      return false;
  }
  else if (e)
  {
    if (e.which == 13)
      return false;
  }
  return true;
}