Changing pictures when menu button is highlighted CS 5.1

Hello,

I'm in the process of creating a DVD and I've hit an obstacle.

I've created a series of buttons linking to various chapters of a DVD on one side of a photo shop file, and on the other I have a number of still images that give a 'demo' of what's in each chapter.

Menu button highlights are all fine, the question is how do I link the buttons so when I've highlighted one, the 'demo picture' changes with it?

I've fiddled around with linking layers together, etc, but I can't quite work it out.


Any help would be greatly appreciated!

Thanks!