[ear1grey]

…only the front page is id-ed as current as the forum link is active, while topic-page should return as current aswell, cause I want this page to be “under” the forum link as well…

<grimace />

If you do that (a) your page won’t validate and (b) there’s no guarantee of how the browser will interpret the content because HTML4 and XHTML specs require that element ID is unique in a page.

From HTML4 spec:

“id ID #IMPLIED — document-wide unique id —

class CDATA #IMPLIED — space-separated list of classes —

Yet another reason to use class="current". Using classes and ID’s appropriately is important.