Right inside your print_stylesheet function, you should be able to require that variable x equal variable y. But that would screw with the ability of the user to select something totally different if that's what floats their boat. So I guess either you want to frame your x=y statement in such a way that if the values are changed they decouple, or else just set both variables to the same thing up in the settables list. *rueful* I usually go with the latter, despite it being longhand, as it were.