[jQuery] replaceClass plugin now works on hover or click

[jQuery] replaceClass plugin now works on hover or click


Thanks to feedback about the first version of this plugin, I have
added the ability to trigger it on click as well as hover.
http://plugins.jquery.com/project/replaceClass
Note: There is a switchClass effect in jQueryUI but it currently does
not work in WebKit browers, like Chrome or Safari.