Is there any way to put a background on a background...

Hm.. I'm not sure what you talking about realy, but you could maybe use tables to do it. You can have a seperate background for each cell.

http://lissaexplains.com/tables.shtml

i find DIVs more flexible :)

<DIV style="position: absolute; left: ##px; top: ##px;"><img src="URL" /></DIV>

edit the bold parts.. the blue part is not necessary, but you need it if you want to position the "background image".. you would replace the bold ##s with pixel positions from the left and top of the screen.