JavaScript控制鼠标滑轮事件

<script language="javaScript">
<!--
//document.body.onmousewheel = function(){alert('你在滚，哈哈');}

function img_zoom(e, o){ //图片鼠标滚轮缩放
　 var zoom = parseInt(o.style.zoom, 10) || 100;
　 zoom += event.wheelDelta / 24;
　 if (zoom >0) o.style.zoom = zoom + '%';
　 return false;
}
//-->
</script>
<img src="http://www.cncms.com/bannner.jpg" width="500" height="500">