Derrick -
Thank you very much. Your advice did the trick. I was able to make the product page and checkout pages use a different template.
FYI - What I am trying to do, is to remove a bunch of the navigation etc. from the cart and checkout pages in order to simplify them. The reason is that I figure, I don't want a navigation and other links "distracting" a customer once they have put a product into the cart and are ready to buy it.
Bahman