I have searched for 2 days trying to find an answer and to be honest I'm pooped.

I had no problem editing the header, footer, left & right, but where on earth is the file to edit the main contents of the page?

Where "New Products For December" header is on a new install of oscommerce.

http://potada.com/purchase/index.php

You would be my greatest hero if you could tell me which file I should be editing.

Thanks a ton from a VERY newbie in advance.