[jQuery] Superfish: drop down slide down / slide up effect - how to?

[Dasher]

Hello,

I have just discovered superfish - it is awesome - the jquery
interaction is great.

Is it possible to have the superfish drop down items slide down and
slide up like the menu on this page?
http://spicebrains.com/multi-level-drop-down-menu/#examples

I really love that effect and have seen it on a number of sites before
and always thought it looked cool.

My current menu seems to show and hide the drop down items and uses
the following code.

        $('ul.sf-menu').superfish({
            delay:       1000,
            animation:   {opacity:'show',height:'show'},
            speed:       100,
            autoArrows:  true,
            dropShadows: true
                        });

Thanks in advance.