Hey, I'm not sure if this is what you are talking about, but here goes!
In DW there is a behavior called "swap images." This will allow you to have a image swap when you roll over it.
I did something similar on http://www.purplefishphotography.com/children.html
Is that what you are looking to do? The setup is a little tricky at first, but once you get the hang of it, it's great.
I'm sure there's another code out there somewhere that will do it if you are not using DW.
I hope this helps!
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