if (navigator.platform == "Win32" && navigator.appName == "Microsoft Internet Explorer" && window.attachEvent) {
  window.attachEvent("onload", pngfix);
}

function pngfix() {
  var b = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
  var ie = (b != null && Number(b[1]) >= 5.5);
  if (ie && document.all) {
    var i, a, f;
    for(i=0; (a = document.getElementsByTagName("img")[i]); i++) {
      if (a.className=="pnga") {
        f = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+a.src+"')";
        a.src = "img/spacer.gif";
        a.style.filter = f;
      }
    }
  }
}