This UniBackground script allows you to load any Flash and YouTube video or Flash animation and use it as a fullscreen background. It’s fully customizable through XML , the whole preview with all buttons and graphics was made exclusively via XML (no Flash/Action Script required).
Demo
http://activeden.net/item/fullscreen-uni-background-youtube-flv-swf/547837
Download
http://www.mediafire.com/?3vhzo5pimzojn64