I need a JQuery menu that fits the design of a site

I'm looking for a drop down menu (done in JQuery) that will display the categories on http://www.coolest-gadgets.com/

As there are so many categories I would like to easily be able to configure how many rows and columns the menu should contain (I'm expecting when dropped down it will be close to the width of a page). The "Categories" menu item will replace the "Home" link in the top blue menu bar (and must look like a menu will drop when clicked). The look and feel of the menu needs to fit with the current site design.

Any questions please feel free to ask.