[JS/CSS]`Sliding` Menu's

Hey all,

On some websites I see that hey have menu's with like display:block/none;
Now that's not so hard, but these websites also have a cool `sliding` effect for them, just not 'Click: open/Click: close' but, 'Click: slide..open/Click: slide..close'.

Now some sites use flash for that, but I've seen some with just CSS / JS..
Anobody knows how they do that?
I'd like to learn it =p

Cheers,

~Elite.

mootools fx.slider

See Zapatec DHTML Menu.

Thanks for answers. I really need this script. Are so cool this `Sliding` menus