Hi Lady,
I took a look at you source coding and like you, I did not see any background color codes other than the table itself.
I then took a look at your CSS files and noticed the backgrounds are actually in a gif format and some with the color codes.
They can give you an idea of where it is located on the page as it tells you the size. For you to change the white bkgrd it needs to be done in the CSS file.
hope this helps
voovoo