https://www.iwfdc.org/scripts/fixpng.js

1function checkDOMReady() {
2	if ( document.readyState && ( document.readyState == "interactive" || document.readyState == "complete" ) ) 
3        correctPNG();
4	else setTimeout("checkDOMReady()", 50);
5}
6
7function correctPNG() // correctly handle PNG transparency in Win IE 5.5 or higher.
8   {
9   for(var i=0; i<document.images.length; i++)
10      {
11	  var img = document.images[i]
12	  var imgName = img.src.toUpperCase()
13	  if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
14	     {
15		 var imgID = (img.id) ? "id='" + img.id + "' " : ""
16		 var imgClass = (img.className) ? "class='" + img.className + "' " : ""
17		 var imgOnClick = (img.onclick) ? "onclick='" + img.imgOnClick + "' " : ""
18		 var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
19		 var imgStyle = "display:inline-block;" + img.style.cssText 
20		 if (img.align == "left") imgStyle = "float:left;" + imgStyle
21		 if (img.align == "right") imgStyle = "float:right;" + imgStyle
22		 if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle		
23		 var strNewHTML = "<span " + imgID + imgClass + imgTitle
24		 + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
25	     + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
26		 + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>" 
27		 img.outerHTML = strNewHTML
28		 i = i-1
29	     }
30      }
31   }
32//setTimeout("checkDOMReady()", 500);
33//window.attachEvent("onload", correctPNG);
34
35correctPNG();