This is how I do it currently:
create the rollover in the button as per usual way.
then create a reverse of this for the roll-off, in a separate movie clip,i.e. fade1, this has a stop at the start, then the anim frames, then a stop at the end, the frame at the start is blank…
I line the fade mc over the button precisely.
then add some actionscript to the button on Button Rolloff fade1.gotoandplay(2);
This works fine, but as you can imagine is a pain in the arse when you have 30 buttons, or xml buttons or something, what is the most short-cut way of creating a roll-off effect?