IE6-能让png图片有透明效果的js代码

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
   <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
   <title>IE6-png透明度效果测试</title>
   <style type='text/css'>
       .bg-png{/*这是logo所在top栏的背景图片引用*/
           background: url(topbarbg.jpg) no-repeat left top;
           height: 80px;
           position: relative;
       }
       /*.bg-png img{//注意这里，应用了透明度js后再这样写logo定位在IE6下没有效果，只有写行内样式到img标签中才行
           position: absolute;
           top: 20px;
           left: 40px;
       }*/
   </style>
</head>
<body>
   
   <div class="bg-png" >
       <img src="logo.png" alt="" width="331" height="47" style="position:absolute;top:15px;left:40px;" />
   </div>

</body>

<script type="text/javascript">
        function correctPNG()//改方法会自动获取img标签里面的图片进行去背景处理，所以要注意这段js只针对img图片
        {
        for(var i=0; i<document.images.length; i++)
        {
        var img = document.images[i]
        var imgName = img.src.toUpperCase()
        if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
        {
        var imgID = (img.id) ? "id='" + img.id + "' " : ""
        var imgClass = (img.className) ? "class='" + img.className + "' " : ""
        var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
        var imgStyle = "display:inline-block;" + img.style.cssText
        if (img.align == "left") imgStyle = "float:left;" + imgStyle
        if (img.align == "right") imgStyle = "float:right;" + imgStyle
        if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
        var strNewHTML = "<span " + imgID + imgClass + imgTitle
        + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
        + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
        + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
        img.outerHTML = strNewHTML
        i = i-1
        }
        }
        }
        window.attachEvent("onload", correctPNG);
</script>