var DragRegObserver = Class.create();
DragRegObserver.prototype = {
  initialize: function(element) {
    this.element = $(element);
  },
  onStart: function() {},
  onEnd: function (eventName, draggable, event) {
    if (Draggables.activeDraggable.element == this.element) {
      elem = draggable.element;
      new Ajax.Request(BaseUrl + 'savepos/' + elem.id + 
                       '/' + elem.style.top + '/' + elem.style.left);
    }
  }
}

function new_ZIndex() {
  cur_index = $$('.draggable').map(function(d) { return d.getStyle("z-index") }).max();
  return parseInt(cur_index) + 1
}

function setup_draggable(id) {
  drag = new Draggable(id, { scroll: window });
  old_endeffect = drag.options.endeffect;
  drag.options.endeffect = function(element) { 
    old_endeffect(element); 
    element.style.zIndex = new_ZIndex();
  }
  Draggables.addObserver(new DragRegObserver($(id)));
  $(id).appear({duration: 2.0});
}