This is a wrapper class for the fullscreen API. It should make it easier to use.
It is supported in the latest versions of Chrome and Safari. It will be supported in Firefox in version 10 (which is released tomorrow).
All calls to activate fullscreen have to be made from a user action. So a button click for example.
Here are some useful links. To run the example it has to be run on its own page, not an iframe. So I have linked to where the iframe points in jsFiddle.