The following is CSS code for adding a background image to a page.

/* The page background for the page and the advert section at the top */
.WikiaAdvertPage, .WikiaPage{ 
	background:url("") no-repeat scroll 0 0 transparent;
        background-color:white !important;

/* Make the redundant background div behind the page transparent */
.WikiaAdvertPage .WikiaPageBackground, .WikiaPage .WikiaPageBackground{
	background: none repeat scroll 0 0 transparent;

.WikiHeader {background:url("") no-repeat !important;}