[Moo] How to add Slide & Fade, and Delay

[Bogh]

Hi,
This is my first post here, and I really need your help.

Please help on adding a Slide&Fade effect, and a Delay, on the following 
Mootools code:
---------------------
    $('updates_pulldown').addEvents({
      mouseenter: function(){
    
$('updates_pulldown').removeClass('updates_pulldown').addClass('updates_pulldown_active')
    $('pulldown_contents_wrapper').set('tween', {
    }).show();
      },
      mouseleave: function(){
    $('pulldown_contents_wrapper').set('tween', {
    }).hide();
    
$('updates_pulldown').removeClass('updates_pulldown_active').addClass('updates_pulldown');
      },
    });
---------------------

I have tried some things as you can see below, but nothing worked for me:
---------------------
    $('updates_pulldown').addEvents({
      mouseenter: function(){
    
$('updates_pulldown').removeClass('updates_pulldown').addClass('updates_pulldown_active')
    $('pulldown_contents_wrapper').set('tween', {
      duration: 1000,
      physics: 'pow:in:out',
      transition: Fx.Transitions.Bounce.easeOut // This could have been 
also 'bounce:out'
    }).SlideOut();
      },
      mouseleave: function(){
    $('pulldown_contents_wrapper').delay(1000).set('tween', {
    duration: 1000,
    }).SlideIn();
    
$('updates_pulldown').removeClass('updates_pulldown_active').addClass('updates_pulldown');
      },
    });
-----------------------

Thanks a lot.