[FlashRus]

Чтобы узнать о наведении:
addEventListener
MouseEvent


Чтобы подстветить:
GlowFilter


Маленький пример:

	private var circleMC:MovieClip;
	private var circles:Array;
	private var glowFilter:GlowFilter = new GlowFilter(0xffffff);
 
	private function addEventListeners():void {
		circleMC.addEventListener(MouseEvent.MOUSE_OVER, circleOver);
	}
 
	private function circleOver(e:MouseEvent):void {
		circleMC.addEventListener(MouseEvent.MOUSE_OUT, circleOut);
		for (var i:int = 0; i < circles.length; i++ ) {
			(circles[i] as MovieClip).filters = [glowFilter]
		}
	}
 
	private function circleOut(e:MouseEvent):void {
		circleMC.removeEventListener(MouseEvent.MOUSE_OUT, circleOut);
		for (var i:int = 0; i < circles.length; i++ ) {
			(circles[i] as MovieClip).filters = []
		}
	}

P.S. Вы промазали с разделом.