function alphaBackgrounds(){
   
   var itsAllGood = (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer");
   for (i=0; i<document.all.length; i++){
      var bg = document.all[i].currentStyle.backgroundImage;
      if (itsAllGood && 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('')";
         }                                                
      }
   }
}
if (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {
alphaBackgrounds();
window.attachEvent("onload",alphaBackgrounds);
}