Problem understanding rubrique loop

First of all, hello to everyone in this list from Greece.

Yesterday I found details about SPIP and I must say that SPIP team simply rocks. You 're doing great work ppl.

The only thing that is bothering me, is that there are so few templates to use as an example to learn the way this CMS is workind faster and more efficient, and the skeleton which is constucted in French and makes it a little bit difficult to learn from the first look..

Now my problem, and I want to thank you all in advance, if you bother reading my email.

What I'm trying to make, is a common menu for my template in the following form (suppose that its menu item is a section):

<div id="menu">
  <ul>
     <li class="main"><a href="index.html" class="menu_link">HOME PAGE</a></li>
     <li class="main"><a href="erga.html" class="in_use">WORKS</a></li>
     <li class="main"><a href="dedomena.html" class="menu_link">DATA</a></li>
     <li class="main"><a href="architecture.html" class="menu_link">TRAVELLING IN(TO) ARCHITECTURE</a></li>
     <li class="main"><a href="omada.html" class="menu_link">TEAM</a></li>
     <li class="main"><a href="info.html" class="menu_link">INFORMATION</a></li>
     <li class="main"><a href="contact.html" class="menu_link">CONTACT</a></li>
  </ul>
</div>

I want every time a section is visited the coresponding menu item to take the class="in_use" instead of class="menu_link".

How can that be achieved using the Rubrique Loop?!

Thanks again inadvance for any help provided.

All best,
Thanasis Matsoukas