<public:component>
<public:attach event="onpropertychange" onevent="propertyChanged()" />
<script>
var supported = /MSIE (5\.5)|[6789]/.test(navigator.userAgent) && navigator.platform == "Win32";
var realSrc;
var blankSrc = "images/trans.gif";
if (supported) fixImage();
function propertyChanged() {
   if (!supported) return;  
   var pName = event.propertyName;
   if (pName != "src") return;
   if ( ! new RegExp(blankSrc).test(src))
      fixImage();
};
function fixImage() {
   var src = element.src;
   if (src == realSrc) {
      element.src = blankSrc;
      return;
   }
   if ( ! new RegExp(blankSrc).test(src)) {
      realSrc = src;
   }  
   if ( /\.png$/.test( realSrc.toLowerCase() ) ) {
      element.src = blankSrc;
      element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "',sizingMethod='scale')";
   }
   else {
      element.runtimeStyle.filter = "";
   }
}
</script>
</public:component>