Forum:Background image different when logged out

For the Wikia known as Rickipedia: The Mummy Wiki, I am the highest-ranking editor (the only editor for most of the time, lamentably) and I want to edit the background image on the Wikia. When I am logged in, the page background appears as I arranged it, which is good (the scene from "The Mummy" in which the Mummy himself takes the form of a sandstorm and chases the protagonists as they fly in a plane), but once I log out or view page content without logging in, the page resets itself back to the dowdy old Blue Monaco skin, not very lively for a Wikia about adventure movies. What is it I do? --Dr.Chamberlin 02:54, September 4, 2010 (UTC)
 * If you are an admin, make sure you have made the appropriate changes to MediaWiki:Monaco.css and have Monaco Custom set to the default skin for the wiki in Special:Preferences. -- 03:08, September 4, 2010 (UTC)