Ease MC on key release ... Help!

programming flash
1

Hi, Im trying to get this code to work … The idea is the when I press the “w” key, the MC will move up Y_axis and when I **release **the “w” key the MC eases a little bit further …

Can anyone help …:)?

the MC(walker) code:

onClipEvent (load) {
    speed = 2;
 dist = 100;
    var keylistener:Object = new Object();
    Key.addListener(keylistener);
    keylistener.onKeyUp = function(){
        switch(Key.getAscii(119)){
            case Key.UP :
             new mx.transitions.Tween(this,"_y",mx.transitions.easing.Strong.easeOut,this._y,(this._y-dist),3,true);
            break;
            case Key.DOWN :
                this.moveT("_y", -speed);
            break;
        }
    }
}

The keyframe code:

MovieClip.prototype.moveT = function(point, amount) {
 this[point] += amount;
 walker[point] += amount;
};