function display(toShow, toHide) {
	if(toShow.visible()) {
		new Effect.SlideUp(toShow, {duration: 1});
  	} else {
		if (toHide.visible()) {
			new Effect.SlideUp(toHide, {duration: 1});
			new Effect.SlideDown(toShow, {duration: 2, delay: 1}); 		
		} else {
			new Effect.SlideDown(toShow, {duration: 2}); 					
		}
  	}
}