[Riki]

import flash.events.MouseEvent;
score_txt.text="0";
function handleMouseWheel(event:MouseEvent):void {
var i:Number = 0;
	if ((event.delta > 0 && box_mc.y < 270) || (event.delta < 0 && box_mc.y > 0)) {
		box_mc.y = box_mc.y + (event.delta * 3);
		i++;
                score_txt.text = String(i); //или же score_txt.text = i.toString();
	}
}
stage.addEventListener(MouseEvent.MOUSE_WHEEL, handleMouseWheel);