My old message was about how to make a rollover image, now my new one is how to make the rollover image fade in!
How?
just make an MC of your image fading in - then place that MC in the OVER frame of your button. When the mouse rolls over the button the fade in MC will be played. Be sure to put a stop action in the last frame of the fade in MC other wise it will fade in then keep repeating the fade in.
Peace