Styling An Image Map
Solution 1:
If you work with image maps, I'd advice you to look at ImageMapster JQuery plugin, it can realy help with many image-map manipulation tasks.
It can setup opacity and background color for selected and hover zones, as you want, and ever join different zones in one area, making them working together.
I haven't tried Mapper you named, because of it's non-commerce licence, what doesn't satisfy my developer needs. But I have tried ImageMapster myself and like how it works - it's powerfull tool under MIT licence, forked from older plugin MapHighlite.
And about lightweight... I doubt it's very important issue because javascript code works in browser, and don't slow down your server. And in case of DOM/styles manipulations works realy fast.
Solution 2:
You could make the image a background image and place invisible <a>
s over top with display:block;position:absolute;
etc. and then when you mouse over them, you could make them semi-transparent colors or add borders or something... that would probably look nice, and be relatively simple :)
edit:example
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