Rails - Apr 2005 - acts_as_list plus one more

I have an object that holds a list and also has one more, separate 
object of the same kind:

class Stack ...
   has_many :cards, :order => "position", :dependent => true
   belongs_to :background_card, :foreign_key =>
"background_card_id",
     :class_name => "Card"
   ...
end

class Card ...
   belongs_to :stack
   acts_as_list :scope => :stack
   ...
end

I don''t want the background card to be part of the cards list. How do I
prevent that? (I usually use Stack.find(some_id, :include => [:cards]) 
to load a stack.)

Jim
-- 
Jim Menard, jimm-Xhj3G7Rj6JI@public.gmane.org, http://www.io.com/~jimm/
"All those who believe in psychokinesis raise my hand." -- Anon.