[eluser]rogierb[/eluser]
I wrote a helper function that takes an array of links and checks them against the current URI. If a link matches, it adds a class: "active" to that link. An extension has been build to accomodate for submenu's,which is a whole different story
I guesss in your case, just pass the anchor to a helper function:
<code>Check_for_current_uri(anchor("some_controller/some_method/var1/var2", "title", array("class"=>"replace_this_with_active_class")))</code>
In that function check the current uri to the one in the link. Is it matches, replace the class, if not do nothing or remove the bogus class