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);