Stoping and starting animation based on pressing space.

Hello i am a beginner at action script so this should be fairly easy to answer. Basically i want the default setting to stop the animation stop(); and then when space is held to play();

Here's what i have:

stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyPressed);

stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyNotPressed);

function KeyPressed(evt:KeyboardEvent):void {

    if (evt.keyCode==Keyboard.SPACE){

       play();

    }

}

function KeyNotPressed(evt:KeyboardEvent):void {

    if (evt.keyCode!=Keyboard.SPACE){

       stop();

    }

}

Thanks for the help