Im having the same problem, I hardcoded my theme_usernav file because my client wants tabs (Im new to xoops)in his XOOPS site.

Im modifying the theme, php content,js, css, and navigation for dropdowns and everything works fine, the only problem is that the :active state turns on a bit, but as soon as the module or link loads, the active state is gone and I can't figure out why.

Is it at all possible to have the :active links stay active in xoops?

the related topics I saw were written a little bit in chinesse from my newbie poin of view;
any help greatly apreciated.