You can overrule the background of an individual recording by adding the following string behind the URL:
&BackgroundImageUrl=http://...
for example:
http://p2g.presentations2go.eu/P2GTV/VideoViewer.html?path=LearningValley/Video/2009/12/09/1/nobroadcast.wmv&BackgroundImageUrl=http://wallpapers.free-review.net/wallpapers/42/Nature_Green.jpg