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Are you talking about "logo.jpg" or "bodyBg.jpg"?
Since your site already has an .html extension, you would use Javascripting
to call a PHP script ... otherwise, it would probably be better to use pure PHP.
I mention PHP for other reasons ... future CMS (content management) and
other dynamic features. But would you rather use Javascripting for the
swapping? And how should it swap ... randomly, by day, by week? What it the
criteria for swapping? And do you have other images in the same directory? Give
us the filenames for some of the othe images it will be swapping.
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