How to change Image Map background color onClick event
<p>Currently, I've found that image map background will be changed once mouse-over on it just like following link example</p>

<p><a href="http://davidlynch.org/projects/maphilight/docs/demo_usa.html" rel="nofollow">http://davidlynch.org/projects/maphilight/docs/demo_usa.html</a></p>

<p>What I want is I want to change image map background color once click on it. But I cannot find how to change map background onclick event. Any solution will be appreciate.</p>
