Field of view type effect?
<p>I've been playing around with blocking out other divs on button press, and Block UI is a very nice tool, however it creates rectangular blocks around divs which doesn't really look good, so I was wonering if it was possible to do a "field of view" type block with jquery like the one in the image below.</p>

<p><img src="http://i.stack.imgur.com/tI5Lu.jpg" alt="enter image description here"></p>

<p>Thanks so much :)</p>
