(function() {
  $('.menu ul li').hover(function(e) {
    var target = $(e.currentTarget);
    if (target.children().length < 2)
      return;
    
    var ul = $(target.children()[1]);
    ul.css('height', 'auto');
    var height = ul.height();
    ul.css('height', '0px');
    ul.stop();
    ul.animate({'height': height}, {duration: 500});
  }, function(e) {
    var target = $(e.currentTarget);
    if (target.children().length < 2)
      return;
    var ul = $(target.children()[1]);
    ul.stop();
    ul.animate({'height': 0}, {duration: 500});
  });
})();