as3 question

// FULLSCREEN
	
this.btn_fullscreen.addEventListener(MouseEvent.CLICK, Fullscreen);


this.btn_fullscreenclose.addEventListener(MouseEvent.CLICK, Fullscreen);


addEventListener(Event.ADDED_TO_STAGE, init);             
function init(e:Event):void
{
	//je kan pas naar stage events luisteren, nadat het toegevoegd is aan de stage. Vandaar dat je even moet
	//wachten op de ADDED_TO_STAGE event.
	stage.addEventListener(FullScreenEvent.FULL_SCREEN, fullscreen_event);
}


function Fullscreen(evt:MouseEvent) 
{
	switch (evt.type) 
	{
			
		case MouseEvent.CLICK :	
			if (stage.displayState == StageDisplayState.FULL_SCREEN)
			{
				stage.displayState = StageDisplayState.NORMAL;
				this.btn_fullscreen.visible = true;
				this.btn_fullscreenclose.visible = false;
			}
			else
			{
				stage.displayState = StageDisplayState.FULL_SCREEN;
				this.btn_fullscreen.visible = false;
				this.btn_fullscreenclose.visible = true;
			}
		break;
	}
}
function fullscreen_event (event:FullScreenEvent):void
{
	if (event.fullScreen == true)
	{
		// now being in fullscreen mode
		this.btn_fullscreen.visible = false;
		this.btn_fullscreenclose.visible = true;
	}
	else
	{
		// back to window mode
		this.btn_fullscreen.visible = true;
		this.btn_fullscreenclose.visible = false;
	}
}

// Gallery


this.btn_gallery.addEventListener(MouseEvent.CLICK, ShowGallery);
this.btn_galleryclose.addEventListener(MouseEvent.CLICK, ShowGallery);






var ShowGalleryToggled:Boolean = false; //variable om te kijken of autorotate aangezet is.


function ShowGallery(evt:MouseEvent) 
{
	switch (evt.type) 
	{
		
			
		case MouseEvent.CLICK :	
			if(!ShowGalleryToggled)
			{
				krpano.call("action(showgallery)");
				this.btn_galleryclose.visible = true;
				this.btn_gallery.visible = false;
				ShowGalleryToggled = true;
			}
			else
			{
				krpano.call("action(hidegallery)");
				this.btn_galleryclose.visible = false;
				this.btn_gallery.visible = true;
				ShowGalleryToggled = false;
				
				
				
				
			}
		break;
	}
}