// JavaScript Document
// Original code (youngpup’s Sleight): http://youngpup.net/2001/sleight
// Updated by Drew McLellan at http://www.allinthehead.com/retro/69
// namespace and onload event added by zigotica.com
var OPACITIES = {
   addLoadEvent : function (fn) {
      var old = window.onload;
      if (typeof window.onload != 'function') {
         window.onload = fn;
      }
      else {
         window.onload = function() {
         old();
         fn();
         }
      }
   },
   
   alphaBackgrounds : function(){
      var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
      var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);
      if (itsAllGood){
         for (i=0; i<document.all.length; i++){
            var bg = document.all[i].currentStyle.backgroundImage;
            if (bg){
               if (bg.match(/\.png/i) != null){
                  var mypng = bg.substring(5,bg.length-2);
                  document.all[i].style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+mypng+"', sizingMethod='scale')";
                  document.all[i].style.backgroundImage = "url('')"; //doesnt exist ?
               }
            }
         }
      }
   }
}

if (document.getElementById && document.getElementsByTagName && navigator.appVersion.indexOf("MSIE") > -1 && !window.opera) {
   OPACITIES.addLoadEvent(function(){OPACITIES.alphaBackgrounds();})
}


<!--[if gte IE 5.5000]>
function correctPNG()
{
  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
    }
  }
}
if (document.getElementById && document.getElementsByTagName && navigator.appVersion.indexOf("MSIE") > -1 && !window.opera) {
	window.attachEvent("onload", correctPNG);
}
<!--[endif]-->