How do I highlight parts of an imagemap on mouseover?
After actually using it in production I'd say this is the answer: http://plugins.jquery.com/project/maphilight
Using this it takes a few lines of code to implement that feature for any imagemap.
Highlight parts of an image on mouseover
Either use an image map or make "invisible" divs on top of each person. Both have their pro's and cons but an Image Map was created specifically for what you need.
To "Light them up" your only choice would be to overlay a .png image (on :hover of invisible div) with a transparent background with a cut out of that person, but edited to be "light"
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