[Mediawiki-l] including a allpages and categories links in the sidebar

I want to include some links from the SpecialPages, e.g. Allpages and Categories, but I see there is no such a 'allpages-url' or 'categories-url' variables. I would like to put them like this:

$wgNavigationLinks = array ( array( 'text'=>'mainpage', 'href'=>'mainpage' ), array( 'text'=>'recentchanges', 'href'=>'recentchanges-url' ), array( 'text'=>'randompage', 'href'=>'randompage-url' ), array( 'text'=>'allpages', 'href'=>'allpages-url]]' ), array( 'text'=>'categories', 'href'=>'[[allpages-url]]' ), );

and, in general, how can I include a custom link under navitationlinks or "toolslinks"?

Thank you very much,

Pablo