That depends on exactly where you want the backgrounds. Header-top-right sounds like it should go in the #headerWrapper div, and footer-bottom-right sounds like it should go in either #contentMainWrapper or #navSuppWrapper. Not sure about "right".
And are you talking about backgrounds that change depending on the page or category? Or just images in different parts of the page? You only need any PHP code if you want bg's that change.
If you can post an image mockup, we can advise more accurately what you need to do.
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