div透明的样式（兼容IE,FF）

兼容ff和IE的div透明度设置，css代码和js代码
#AdLayer{   
 
     filter:alpha(opacity=30);    
     -moz-opacity: 0.6;    
     opacity: 0.6;    
    position:absolute;    
    width:61px;    
    height:59px;    
    z-index:20;    
    visibility:hidden;    
     left: 600px;    
     top:300px;    
}   
function run(){    
    if (navigator.appName.indexOf("Internet Explorer") == 10){    
    alert("IE浏览器："+document.getElementById('div1').filters.alpha.Opacity);    
    }else{    
    alert("FF浏览器："+document.getElementById('div1').style.opacity);    
    }    
}
 

JS写法：
仅支持 FF
<script>document.getElementById("Layer1").style.opacity = "0.5";</script>
 
IE Only
<script>document.getElementById("Layer1").style.filter = "alpha(opacity=50)";</script>