Don’t you hate when a transparent format like PNG isn’t so transparent to Flash. Finally, there is a way to ignore transparent parts of a PNG within MovieClips during mouse interactions. It is called InteractivePNG.
What is InteractivePNG?
InteractivePNG is a very handy little utility class that allows you to disable the hit area of a PNG if the pixels are transparent.
Currently, when you save out a PNG that has transparency, rolling over the transparent part of the PNG will still register as roll over because Flash still reads it as part of the image. However, with this class, that is no longer the case.
This may seem to be an easy trick or is it? Check out this class for yourself!