ActionScript 3.0 :: Make A Simple Animated News Page For Digital Flash Magazine?

im trying to make a simple animated news page for digital flash magazine, I want there to be several boxes on the page that are static until you mouse over them at which point they will start to animate. I have got that far i have created the symbol and i have build the animation inside of the symbol.In my actions layer i have put...

Symbol.stop();

Symbol.addEventListener(MouseEvent.ROLL_OVER, animateMC);
function animateMC(evt:MouseEvent):void{
Symbol.play();
}

and that works the symbol is static until i mouse over and it begins to play the part im having an issue with it making the animation stop when you move your mouse away (MOUSE_OUT)