newbie - tkinter - how to do button rollover

[leapinglemur00 at my-deja.com]

I seem to be missing something -- I'd like to do
a "rollover" sort of effect with the image on a
button changing as the mouse goes over it.  I
know how to respond to the mouse event, but how
do you change the image?  Is there a method on
the Button class to set the image?  Is there some
place in the documentation where I could find
this?

Thanks a lot...




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