透明背景文字不透明

<style type="text/css">
.box{ width:800px; height:150px; background:#CCC;filter:alpha(opacity=30);opacity:0.3; }
</style>
<br/>
<div class="box">  
    <div style="position:relative">div的position属性为relative,IE认为包含文字的div脱离了标准流，样式就不再继承</div>
</div>
<br/>

<div style="position:relative">
<div class="box"></div>
<div style=" position:absolute;color:#000; left:0px; top:0px">

    同级的透明的容器和不透明的容器显示重叠</div>
</div>