Mapper.js 
Posted on December 21, 2007
Automatic area highlighting for image maps
http://www.netzgesta.de/mapper/
Mapper.js 1.0 allows you to add automatic area highlighting to image maps on your webpages.
It works in all the major browsers – Mozilla Firefox 1.5+, Opera 9+, Safari and IE6+. On older browsers, it can use “jsgraphics” from Walter Zorn (if installed), else it’ll degrade and your visitors won’t notice a thing.