codice:
in_btn.addEventListener(MouseEvent.MOUSE_DOWN,mouseSopra)
function mouseSopra(evt:MouseEvent):void
{
	l.addEventListener(Event.ENTER_FRAME,zoomIn)
	function zoomIn(evt:Event):void
	{
		l.width+=1
		l.height+=1
		}

in_btn.addEventListener(MouseEvent.MOUSE_UP,mouseFuori)
function mouseFuori(evt:MouseEvent):void
{
	l.removeEventListener(Event.ENTER_FRAME,zoomIn)
}
	}
/////////////////////////////////////
out_btn.addEventListener(MouseEvent.MOUSE_DOWN,mouseSopra2)
function mouseSopra2(evt:MouseEvent):void
{
	l.addEventListener(Event.ENTER_FRAME,zoomOut)
	function zoomOut(evt:Event):void
	{
		l.width-=1
		l.height-=1
		}

out_btn.addEventListener(MouseEvent.MOUSE_UP,mouseFuori)
function mouseFuori(evt:MouseEvent):void
{
	l.removeEventListener(Event.ENTER_FRAME,zoomOut)
}
	}