滚动鼠标滚轴，缩放图片大小

// CTR+滚动鼠标滚轴，缩放图片大小
<script language="JavaScript">
function imgzoom(o) {
if(event.ctrlKey)
{
   var zoom = parseInt(o.style.zoom, 10) || 100;
   zoom -= event.wheelDelta / 12;
   if(zoom > 0) {
    o.style.zoom = zoom + '%';
   }
   return false;
}
else
{
   return true;
}
}
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>

用法： <img src="163askLogo.gif" width="154" height="80" onmousewheel="return imgzoom(this);" />

//只是滚动鼠标滚轴，缩放图片大小

用法：<IMG onmousewheel="return bbimg(this)" src="imgsrc" border=0/>