CSS Rollover Buttons
http://www.webcredible.co.uk/user-friendly-resources/css/rollover-buttons.shtml

Angeletti, Mark
Search-This
2004

Abstract:

There are many different button-rollover tutorials available on the web, some JavaScript and some CSS, but none of the ones I have seen yet match that of the Trifecta button. Let's start with what makes the CSS rollover Trifecta button different from the many other rollovers you may have already seen. Alternative sites are locatable with the key phrase: "Trifecta Button" in any search engine.