function active_toggle(e) { 
  if (e.hasClassName('active')) {
    e.removeClassName('active');
  } else {
    e.addClassName('active');
  };
}

function disable_secondary_if_empty(value) {
  if (value == '') {
    $('page_secondary').disabled = true;
    $('page_secondary_label').addClassName('disabled');
  } else {
    $('page_secondary').disabled = false;
    $('page_secondary_label').removeClassName('disabled');
  }
}