Sync this up with the github version.

Important changes:

* Works with IE 8
* New "neverOn" option for use with metadata by Zach Dennis, which stops individual areas from ever being hilighted
* Handles being called on the same area twice differently; now rebuilds the hilighted regions.

Images are now wrapped in a span (set to display:block) instead of a div, to avoid a quirky IE invalid-nesting complaint which you would only see if you placed an img somewhere a div strictly shouldn't be.

Examples all updated to use .load() handlers, which prevents the images collapsing the first time you view a page. E.g.:

$('img[usemap]').load(function() { $(this).maphilight(); });

Include a minified version with the archive. (Using the YUI compressor.)

Various tweaks to make JSLint and YUI happy.

Improved examples in the documentation.