gistfile1.js

var rules = {
    // JQUERY: TODO
    '.admin div.dropdown': function(element){
      var replacement = $(element).down('.dropdown_replacement');
      var menu = $(element).down('ul.dropdown').hide();
      var toggle = function(){
        menu.visible() ? menu.hide() : menu.show();
      }
      replacement.observe('click', toggle);
    }
}
Behavior.register(rules);