Stygg,

Sounds like you are doing it the right way. I create the mouse off button that I want and group it. The copy it, switch to the mouse over layer and paste in place (Shift+Ctrl+v). Then I use the great object gallery to drill down to the elements of the mouse over button that I want to change and make the changes. Then I marquee select both the mouse over and off buttons, apply a soft group (Ctrl+Alt+g), and apply a link. Then you can turn on or off the mouse over layer if you don't want to see them while you continue working.

Unless I missed something our methods sound very similar.

Eric,