copy your frame to a new frame, and adjust the images on the new frame to have a glow, then slice the images, and add a rollover effect (right click slice, choose rollover).
There are proper instructions in fireworks help - rollover effects.
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Sometimes, when my code just won't behave, I take it outside and make it listen to britney spears music, and when it comes back it's really well behaved. I wonder if it's suffering from post tramatic stress syndrome now..