function toggleFullScreen() {
	if (!document.fullscreenElement && // alternative standard method
		!document.mozFullScreenElement && !document.webkitFullscreenElement) {// current working methods
		if (document.documentElement.requestFullscreen) {
			document.documentElement.requestFullscreen();
		} else if (document.documentElement.mozRequestFullScreen) {
			document.documentElement.mozRequestFullScreen();
		} else if (document.documentElement.webkitRequestFullscreen) {
			document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
		}
	} else {
		if (document.cancelFullScreen) {
			document.cancelFullScreen();
		} else if (document.mozCancelFullScreen) {
			document.mozCancelFullScreen();
		} else if (document.webkitCancelFullScreen) {
			document.webkitCancelFullScreen();
		}
	}
}