Scrolling Div in Dropdown menu Only Displays in Firebug v.1.4.5

[BlueHandTalking]

I am using a script for an animated drop down menu, ddmenu.js
Here is a pastie for that script:

http://pastie.org/705995

With this I am using

document.observe('dom:loaded',function(){
var scrollbar = new Control.ScrollBar
('scrollbar_content','scrollbar_track');
});

from Prototype.

It will not display normally. If I run the following script in
Firebug:

scrollbar.recalculateLayout();

It works just fine, even after closing Firebug. My problem, not
having in-depth javascript knowledge,is how I can have the above
script called.

Should I be using 'Ajax.PeriodicallyUpdate', since both scripts are
trying
to connect to event onmouseover? Or, ??

Any ideas appreciated.

Thanks,

Jet