http://www.christianmontoya.com/2006/09/18/revisiting-image-rollovers/
If you're talking about the Ryan Rollovers that you link to, it looks very similar to the Gilder-Levin method which is mentioned at http://www.mezzoblue.com/tests/revised-image-replacement/ (dated 2004) and was updated to become the Gilder Levin Ryznar Jacoubsen method - http://www.ryznardesign.com/web_coding/image_replacement/
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