are you wanting to change the white to something else?
If so look at the order of the stylesheets and then make your amendment in the last one as this will overwrite any changes made in previous ones this should be available to change in the body settings in the stylesheet, if you are still stuck e-mail me:
[email protected] (replace the 0's with o's) and I will talk you though the amendments
Kind Regards
Rob
p.s. you want to have something like:
background-image: url("............."); in the correct bit of your stylesheet