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');
  }
}

function add_corners(elements) {
  elements.each(function(element, index) {
    new Insertion.Bottom(element, '<div class="corner-tl"> </div><div class="corner-tr"> </div><div class="corner-bl"> </div><div class="corner-br"> </div>');
  })
}