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This is one you see a lot. It is frequently used to create navigation buttons that recede or light up when the mouse moves over them.
First you need to create two images, one for the "on" state and the other for "off."
The href="javascript:;" part is a null link - meaning that it doesn't go anywhere or load any new content. It could be replaced with a functional link that would load a new page. Both images should be the same size.

light-off.jpeg
light-on.jpeg
<a href="javascript:;"
onmouseover="light.src='light-on.jpeg'"
onmouseout="light.src='light-off.jpeg'">
<img name="light" width=75 height=75 border=0 src="light-off.jpeg"></a>
(BTW, this also works with animated GIFs.)