JQuery-Fullscreen-Event is a project mainly written in JavaScript, it's free.
Adds a 'fullscreen' event to show whether the browser entered or leaved fullscreen mode
Simple plugin to trigger an event once browser enters or leaves fullscreen mode.
USAGE:
$(window).bind('fullscreen', function(ev, is_fullscreen){ // is_fullscreen will reflect fullscreen condition });
OR:
$.onfullscreen() // returns the current state