onClipEvent(enterFrame) {
  //Movement Horizontally
  if(Key.isDown(Key.RIGHT)) {
    _x += speed;
  } else if(Key.isDown(Key.LEFT)) {
    _x -= speed;
  }

  //Movement Vertically
  if(Key.isDown(Key.DOWN)) {
    _y += speed;
  } else if(Key.isDown(Key.UP)) {
    _y -= speed;
  }
}