visibility.js

var handleVisibility = function(){
			if ( document.hidden ) {
				// The page is hidden.
				Store.set('app:hidden', Date.now());
			} else if( Store.has('rabobank:app:hidden') ){
				// The page is visible and has a timestamp saved.
				var timestamp = new Date(Store.get('app:hidden')),
					maxTimePassedAllowed = 1000 * 60 * 2,
					isPast = (new Date().getTime() - timestamp < maxTimePassedAllowed) ? false : true;

				if( isPast ){
					services.logOff();
				}
			}

		};
document.addEventListener('visibilitychange', handleVisibility);