Using prototype/lowpro to reorder items on screen. JS not working

Have the following JS included in my HTML:

document.observe('dom:loaded', function() {
  Event.addBehavior( {
   'a.move-up:click':  function(event) {
        moveUp(this);
        event.stop();

    },
   'a.move-down:click':  function(event) {
        moveDown(this);
        event.stop();
    }
  });
});

function moveUp(element) {

  var questionElement = $(element).up('div.question');
  var preQuestionElement = questionElement.previous('div.question');
  moveElments('up', questionElement , preQuestionElement);
}

function moveDown(element) {
  var questionElement = $(element).up('.question');
  var postQuestionElement = questionElement.next('.question');

  moveElllments('down', questionElement , postQuestionElement);
}

function moveElments(direction, targRow, sibling) {
    var targetParent = targRow.up('div.questions');
    if(direction == 'up'){
      targRow.remove();
      targetParent.insertBefore(targRow, sibling);
    }
    if(direction == 'down'){
      sibling.remove();
      targetParent.insertBefore开发者_C百科(sibling, targRow);
    }
}

I then have a link that, when clicked, should move a question (enclosed in div.question) up within a parent (div.questions).

<a class="move-up" href="#" style="">Move Up</a>

However it does not seem to work. Appears that the Event handler does not see the "click" event...

What is wrong with that code? Thanks!

Im not familiar with lowpro, but here's a solution using vanilla Prototype, and attaches your event listeners using observe:

document.observe('dom:loaded', function() {
  $$('a.move-up').observe('click', function(event) {
    moveUp(this);
    event.stop();
  });

  $$('a.move-down').observe('click', function(event) {
    moveDown(this);
    event.stop();
  });
});