Key Controls - Stop @ Bottom & Top of movie

[N64MARIO64]

How do I make a movie clip stop at the top & bottom of the movie. So far I have this.I have this already haveon
ClipEvent(load){
speed = 5;
}
onClipEvent (enterFrame) {
(Key.isDown(key.DOWN))?(this._y+=speed):null;
(Key.isDown(key.UP))?(this._y-=speed):null;
updateAfterEvent();
}

 

[frozenpeas]

Try this:

onClipEvent(load){
speed = 50;
top = 0;
bottom = Stage.height;
}
onClipEvent (enterFrame) {
(Key.isDown(key.DOWN))?(this._y+=speed):null;
(Key.isDown(key.UP))?(this._y-=speed):null;
(this._y < top)?(this._y = top):null;
(this._y > bottom)?(this._y = bottom):null;
updateAfterEvent();
}

 

[N64MARIO64]

Thank you frozenpeas - It works - a few bugs - but I fixed it up. Thanks