active trails

What I have:
A primary menu (one level depth) at the top of the page.
Some secondary menus to the right, that changes depending on primary links (controlled via Visibility).

What I need:
Primary links to stay active when secondary links activated.

You can see the project I'm working on at nexos

I'm a graphic designer, trying to evolve to serious web design with Drupal, and think I accomplished the theme task very well, but this challenge of active trails...