sliding doors header: how?

I really love the ease of customizing this theme, have had no problems at all with it. For a rank newbie, that's saying alot.
I do, however, have one question. I downloaded this theme: http://mac-host.com/slidingdoor/ .
I really like the sliding images category menu, but don't like the rest of the theme all that much. Is there any way to incorporate this effect into your theme? Please keep in mind that I am a rank newbie, and make your answers as simple as possible, so I can follow.

Thanks for any help you can give me.