Remove Central box from checkout

How can I remove the Central top & bottom appearance box from the Checkout pages? I currently am using Listmania to display Google adsense in these two boxes above and below my body, but I do not want them loading or displaying in Checkout.



To see, go to www.puppys-place.com.



Thanks.



BR

The top bar and the image below it are stretching far to the right in firefox 3.