Adding a complex rollover to the transitions tutorial

Iv been using the following tutorial http://www.kirupa.com/developer/mx2004/transitions.htm to have in and out transitions for my external pages. No problem there, helpful tutorial and everythings loading and unloading fine.

Problem is I want to attach a nice complex rollover to the over state of the buttons. But When i do this it disables the action of both the button (it refuses to load anything) and prevents the rollover (which now just blinks in an erratic manner). They only work when not on top of one another… if the rollover is positioned outside of the hit area of the button. Obviously though i want the rollover effect to take place within the area of the button.

Is there any way around this? If that made any sense at all of course.