function swappng() {
	for( var x=0; x<document.images.length; x++ ) {
		if( document.images[x] && document.images[x].src.indexOf(".png")>0 ) {
			document.images[x].style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+document.images[x].src+"', sizingMethod='scale');";
			document.images[x].src = "/null.gif";
		}
	}
}

if (/MSIE (5\.5|6).+Win/.test(navigator.userAgent)) swappng();