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Catch My Fame » Blog Archive » jQuery Before/After Plugin
http://www.catchmyfame.com/2009/06/25/jquery-beforeafter-plugin/

Pretty nifty before/after image slider in javascript
About a month ago I was reading the New York Times online and they had an article which showed a road in Brooklyn that had been reconstructed to make it safer and more pleasing to the eye. To show the difference in the reconstruction project, they showed a before and after picture using Flash that let the visitor drag a slider over the images, which were sandwiched with one on top of the other, so that you could easily see how dramatic the changes were. I immediately thought that this could be done in JavaScript using jQuery, so I set out to do it.