how did they do that

Client likes how the below site has the thumbs and you can scroll over to get bigger image displayed. (they don't need the copy included in bigger image)

I used to be able to do this with behaviors and tables but am not sure how to do it with css.  Is there a software out there I can buy that would help do this, or perhaps a website with a tutorial?
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This looks like a simple rollover image - when the mouse goes over the image it just changes it to another one...
It's easy to do in Dreamweaver as it creates the Javascript code for you, and there's a tutorial here for it:

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RobOwner (Aidellio)Commented:
the zoom is actually the bottom half of the image.  only the top half is displayed initially and then the bottom half.  

It's pure CSS using :hover on the image

.goods:hover img {
margin-top: -370px;

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see here for a demo
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