js获取图片实际的宽度
<img src="http://www.hao123.com/images/guangg/2009year.jpg" width="200" id="imgs"/>

<script>

document.write("宽："+imgs.width+" 高："+imgs.height)

</script><br>

<img src="http://www.hao123.com/images/guangg/2009year.jpg" id="image"/>

<script>

document.write("宽："+image.width+" 高："+image.height)

</script>