Event.observe(window, 'load', function(){ 

  $$("ul.dropdown li").each(function(elem){
  
    Event.observe(elem,'mouseover',function() { 
      elem.addClassName('hover');
      elem.addClassName('open');
      elem.select('ul:first').each(function(obj3) { obj3.setStyle({visibility:'visible'}); });
      elem.select('> .dir').each(function(obj3) { obj3.addClassName('open'); });
    });
    
    Event.observe(elem,'mouseout',function() { 
      elem.removeClassName('hover');
      elem.removeClassName('open');
      elem.select('ul:first').each(function(obj3) { obj3.setStyle({visibility:'hidden'}); });
      elem.select('.open').each(function(obj3) { obj3.removeClassName('open'); });
    });
  
  });

});