如何获取ie下面的alpha直

Question

<img id='ss' src='http://hiphotos.baidu.com/qwjmys/mpic/item/691db5065867c6ef7b894793.jpg' height="300" width="400px;" style="filter:alpha(opacity:50); opacity:0.5">该如何获取

Answer 1

<img id='ss' src='http://hiphotos.baidu.com/qwjmys/mpic/item/691db5065867c6ef7b894793.jpg' height="300" width="400px;" style="filter:alpha(opacity:50); opacity:0.5"> 
<script language="javascript">
<!--
alert(document.getElementById("ss").filters.alpha.opacity)
//-->
</script>