[CS3] Suspected Looping Problem

Hi,

I move my mouse left and right, yet the score stays the same. Can anyone help tell me why?

Thanks :)

Code:

---

onClipEvent(enterFrame) {

        if (score>0) {
} else {
  score = 0;
}

        trace (score);
        _parent.score_txt.text = score;
       
        if(_root._xmouse < 200) {
                _parent.left_whisk._visible = false;
                _parent.right_whisk._visible = true;
                score = score++;
        }
       
        if(_root._xmouse > 350) {
                _parent.left_whisk._visible = true;
                _parent.right_whisk._visible = false;
                score = score++;
        }

}

---