IE6中正确显示png图片

在ie6中，png图片总是显示一个灰背景，很丑，从网上查了下解决办法如下，原文已经打不开了，所以就不注原文地址了，需要准备一个文件名为blank.gif的透明图片：

function correctPNG() // correctly handle PNG transparency in Win IE 5.5 & 6.
{
var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);
if ((version >= 5.5 && version < 7.0) && (document.body.filters))
{
for(var j=0; j<document.images.length; j++)
{
var img = document.images[j];
var imgName = img.src.toUpperCase();
if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
{
var width = img.width;
var height = img.height;
var sizingMethod = (img.className.toLowerCase().indexOf("scale") >= 0)? "scale" : "image";
img.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.src.replace('%23', '%2523').replace("'", "%27") + "', sizingMethod='" + sizingMethod + "')";
img.src="images/blank.gif";
mce_src="images/blank.gif";
img.width = width;
img.height = height;
}
}
}
}
window.attachEvent("onload", correctPNG);