Need help getting a hold of lisp

[dataangel <k04jg02 kzoo edu>]

I think I'm misunderstanding how hooks are supposed to work. I want 
sawfish to detect when I open XMMS and to remove the equalizer and 
playlist from the alt+tab cycle list. But when I put the code below into 
my ~/.sawfishrc, sawfish stopped managing all windows :P Help?

(add-hook 'before-add-window-hook 

     (lambda (w descr)

       (if (or (string-match-re "XMMS Equalizer" (window-name w))

           (string-match-re "XMMS Playlist" (window-name w)))

       (toggle-window-cycle-skip w))))