Well i was halfway through creating an example in dreamweaver for you, and found this in google
It's a really good example that explanes how to do what you seek. Simply create the nav menu at the top of the layer an inset table and make the nav menu have the same width and position as the layer. The browser will read the nav menu as part of the layer and scroll it when you follow these direction.
I've included three links here that will accomplish a scrolling layer:
http://www.dyn-web.com/dhtml/scroll/scroll-rel.html
http://www.dansteinman.com/dynduo/en...lconcepts.html
http://www.siteexperts.com/dhtmllib/...ller/page1.asp
My personal favorite tutorial is the last link, as it explans how to create the scrolling either through custom scroll bars or through standard IE/Mozilla scroll bars. (by the way, Mozilla now supports overflow, which will make sense when you read these.)
You can create the nav bar through images, tables, whatever.
Remeber that it's best to understand each layer as a mini page that can have it's own character. Thus you can insert images, tables, etc like you would into any page in dreamweaver.
Here's a quick and dirty example of scrolling layers made folling the third site instructions.