function validateForm(f) {
  var e1, e2;
  if( !LastButtonClicked) return true;

  if( LastButtonClicked.id == 'btn_submit') {

    if( !(e1 = document.getElementById('name'))) return false;
    e1.value = trim(e1.value,'');
    if( e1.value == '') { alert('The Contact Name is required!'); return false; }

    if( !(e1 = document.getElementById('email'))) return false;
    e1.value = trim(e1.value,'');
    if( e1.value == '') { alert('The EMail address is required!'); return false; }
    if( !validate_email(e1)) return false;

  } // End of 'btn_submit'
  return true;
}