Detecting screen change from FullScreen to Normal mode

1

Hi

I´m using these lines to make the site fullscreen:


//fullscreen
var full:Boolean = false;
aviso_mc.full_btn.onRelease = function() {
	Stage["displayState"] = Stage["displayState"] == "fullScreen" ? "normal" : "fullScreen";
	_root.full = true;
gotoAndPlay(3);
};

how can I detect when the user press ESC and change to normal mode?

Thanks