Ebay Listing Design Trouble

I have to confess that I have posted this qu. on the web design forum, but I find in general help is more readily available from this one so am posting it here to (sorry to the few of you that this mightily offends!)
I used Netscape composer to design my Ebay listing- I then copied the HTML source into the HTML box on Ebay. Before adding the photo the listing looked excellent with my background just as I wanted it etc. After adding the photo the Written description and little animated images appeared on a white page with only a small percentage of my chosen background around the edge. How do I get my background to show? Thanks!

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