Hi NoBob,
The point of me suggestion you first *try* firebug is based on the simple parable "give a man a fish and he will eat for a day. teach a man to fish and he will eat for a lifetime". Firebug is the most insanely powerful tool and just learning to use the "inspect tool" will make your life a heck of a lot easier
Anywho, back to your question..
The shadow that you mention is a part of the background image that is set on the body element. The template comes with the original fireworks source file, so you can adjust as you like
Cheers,
Chris