window.addEvent('domready', function()
{
  $('hauptnavigation').getElements('ul.level_2').each(function(el) {
      el.set({'opacity':0});
  });
  $('hauptnavigation').getElements('li.submenu').each(function(el) {
    
    var ul = el.getElement('ul.level_2');
    var an = el.getElement('a.submenu');
    el.addEvent('mouseenter', function() {
      new Fx.Morph(ul, {'duration':10}).start({'opacity':1});
      an.setStyle('background-position',[0,-30]);
    });
    el.addEvent('mouseleave', function() {
      new Fx.Morph(ul, {'duration':10}).start({'opacity':0});
      an.setStyle('background-position',[0,0]);
    });
  });
});