import flash.events.MouseEvent;

backgroundButton.addEventListener(MouseEvent.CLICK, onClick, false, 0, true);
backgroundButton2.addEventListener(MouseEvent.CLICK, onClick2, false, 0 ,true);


function onClick(evt:MouseEvent):void {
	backgroundOne.visible = !backgroundOne.visible;
}
function onClick2(evt:MouseEvent):void {
	backgroundTwo.visible = !backgroundTwo.visible;
}