make a menu item active on several items

Hi everybody,

I hava a menu item (base/menu) that will link to all the documents under
the same category. The item itself will be linking some kind of
overview (a document itself) of that gorup of documents. 

What I want to do is to keep the menu item marked as current (for the css
style) for all that group of documents.

Any ideas?

-- 

Rodrigo Lazo (rlazo)