onClipEvent(load) {
  var speed:Number = 0;
  var walk:Number = 3;
  var run:Number = 6;
  var grav:Number = 0;
  var falling:Number = 0;
  var jumped:Boolean = false;
  var jumpHeight:Number = 15;
  var touchingGround:Boolean = false;
  var scale:Number = _xscale;
}

onClipEvent(enterFrame) {
  if (!touchingGround) {
    grav++;
    this._y += grav;
  } else {
    grav = 0;
  }

  if (_root.ground.hitTest(_x,_y,true)) {
    touchingGround = true;
  } else {
    touchingGround = false;
  }
}