Brian, That is set in the macro window. Create your button labeled "back". Then in the macro window, click on the "jump to" button (at the top of the tool bar in the macro window). Then you "check" the default jump, and in that drop down there is a "navigate -" choice that should do what you want (if I'm reading your request properly.
Chasing Ernie's post count, one useless post at a time.