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

function enableAlphaImages(){
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/);
	if (rslt != null && (navigator.userAgent.match(/Opera/) == null)) {
		for (var i=0; i<document.images.length; i++){
			var img = document.images[i];
			if (img && img.src.match(/\.png$/i) != null) {
				if (Number(rslt[1]) < 5.5) {
					img.src = img.src.replace(/\.png$/i, '.gif');
				}
			}
		}
	}
}