// function for handling the transparency display of png images (ie only)
function onPNGLoaded(oImg, dummyImg) {
   if (document.all && !oImg.pngFilterApplied) {
   oImg.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(" +
     "src='" + oImg.src + "',sizingMethod='scale')";
    oImg.pngFilterApplied = "true";
    
    oImg.src = dummyImg;
  }
}