图片随鼠标滚轮变换大小

<img src="1.jpg" bbimg(this)'>
<script language="javascript">
function bbimg(o){
 var zoom=parseInt(o.style.zoom, 10)||100;
 zoom+=event.wheelDelta/12;
 if (zoom>0) o.style.zoom=zoom+'%';
 return false;
}
</script>