| Bascially it's a rollover button in flash.
A button in flash has 4 states, "up","over","down", and "hit".
The change that you see when you roll your mouse over the image or button is the "over" state of your button.
You can even do something like an animation while your mouse is over the button.
Here's a tutorial on rollover buttons.
http://maclab.guhsd.net/flash/mx/button_01.html
Or you can do a more complicated one (animated) by converting the symbol at the "over" state to a movieclip.
http://www.kirupa.com/developer/flash5/animatedrollover.htm |