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<body background="/your/image/path/<?php code to spit out the random filename?>" blah blah blah>
page needs to be php parsed in that case of course
if the page can't be php parsed you'll need to create a .jpg or .gif file which is php parsed which spits out the proper mime heders and the image data for the random image on each load and use that .jpg or .gif named php file as your background image
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