onClipEvent (enterFrame) {
    if (this._x > Stage.width){
    this._x = 0;
    }
    if (this._x < 0){
    this._x = Stage.width;
    }
    if (this._y > Stage.height){
    this._y = 0;
    }
    if (this._y < 0){
    this._y = Stage.height;
    }
}