Modifying jQuery plugin [URGENT]

Modifying jQuery plugin [URGENT]

I want to modify the Drill Down charts plugin here.

I need to make a minor change. Currently when you click on a bar, it automatically zooms in ("drills down"). Instead, I need to make a dropdown menu appear on clicking a bar, from which the user can choose a category to drill down from.

The core components would stay the same including the "drill up" function, but I need to create a variety of options from which to "drill down." Does anybody know the easiest way to do this? I need an answer urgently so please help! I am open to combining another plugin with this one if I have to.

Thanks!