Had to turn off add block to see it.. Interesting way to advertise.
More than likely some header include stuff with it. then set the doc background to a url they provide.
The include identifies you for when it calls for the BG image that gets displayed.
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Looking at it more, their site is not using it to display adds but as a way to get people to their facebook page.. pretty simple to just code that in. It's for advertising your own whatever, not for "adds"..
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