html5 / css/ jquery screensaver

hi, i was wondering whether it's possible to bring up a screensaver for a (local) webpage. the basic idea is that i wanted to have something similar to the 'sliding tiles' screen saver on the mac - but on xbmc. after a little surfing, i found shifting tiles css which basically does the same thing in the browser...

i'm guessing that i could write a python class to open firefox in full screen mode (but i'm pretty sure i'm taking a very simplistic approach to this).