Script: DD Tab Menu

Has anyone tried to "nest" DD tab menus? For example, there would be a second (child) set of menus available when the user mouses over a particular tab from the primary (parent) set of tabs. Can anyone help me with what needs to be tweaked? I'm just learning Javascript and don't have much experience.

Since it would be using the same code 2 or more times, maybe some function names and variable names need to be unique for each "child" menu.

Thanks in advance.