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

function alphaBackgrounds(){ 
	var rslt = navigator.appVersion.match(/MSIE (d+.d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) >= 5.5);
	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('/images/spacer.gif')";  // change this to your own gif
			}
		}
	}
}