Forum:Banner interaction with navbox problem

On Genealogy, we have a banner interaction with a large number of pages (example). The ads display over the menu and generally wander about like lost lambs. This may be an interaction with some Navbox code I picked up from wikipedia in 2007. To get it to work, sometime around this time I copied over some of their CSS to get it to work properly. I tried and chop out a bunch of extraneous junk but I don't recall what I did- only that I could have trimmed a lot more. Anyway, feel free to whack the templates or CSS to fix, and drop me note with a few clues about what was wrong. You need not elaborate much- I may figure out what you did and why. This isn't a burning building problem so it's not in any way a priority request but we do like our collapsible boxes because our subject matter tends to inundate newbies with data. We like not to scare them off. Thanks - ~  Ph l o x  17:16, 5 May 2009 (UTC)
 * Example template that generates the error
 * Navbox/core code uses class "navbox collapsible"