JS代码：
var IE = (document.all) ? true : false; function correctPNG(img) // correctly handle PNG transparency in Win IE 5.5 or higher. 
{ 
if (IE)
{ 
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 var imgAttribs = img.attributes; for (var j=0; j<imgAttribs.length; j++) { var imgAttrib = imgAttribs[j]; if (imgAttrib.nodeName == "align") { if (imgAttrib.nodeValue == "left") imgStyle = "float:left;" + imgStyle if (imgAttrib.nodeValue == "right") imgStyle = "float:right;" + imgStyle break 
} } var strNewHTML = "<span " + imgID + imgClass + imgTitle strNewHTML += " style=\"" + "" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";" strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader" strNewHTML += "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" img.outerHTML = strNewHTML } } 
}
使用：
<Head>标签间插入 <script language="javascript" type="text/javascript" src="path/Png.js"></script>
<body>
<img src="" onload="correctPNG(this);" />
...
</body>