Using just CSS, you can do simple (and more complex) rollovers... no javascript required. This post shows how to apply this technique to your own pages with ease - whether it's a colour change or a more complex image swap.
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How to create rollovers without using Javascript
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How to use “clearfix” CSS to clear floats without markup
Here we extended the normal rules for clearfix and provide a complete CSS solution to clearing floated elements (ensuring that a parent element inherits it's floated child element's height). A complete clearfix redux.