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

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


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

    if( !(e1 = document.getElementById('pass1'))) return false;
    if( !(e2 = document.getElementById('pass2'))) return false;
    if( e1.value == '') { alert('The Password is missing!'); return false; }
    if( e2.value == '') { alert('Password 2 is missing!'); return false; }
    if( e1.value != e2.value) {
      alert('The passwords do not match!'); return false;
    }

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