function checkform ( form )
{
  // see http://www.thesitewizard.com/archive/validation.shtml
  // for an explanation of this script and how to use it on your
  // own website

  // ** START **
  if (form.txtPromo.value == "PROMO") {
    alert( "Correct Promotional Code entered." );
    return true ;
  }
  // ** END **
  form.txtPromo.focus();
  alert("InCorrect Promotional Code entered.");
  return true ;
}