function correctPNG()
{
    for(var i=0; i<document.images.length; i++)
    {
        var img = document.images[i]
        var imgName = img.src.toUpperCase()
        if (imgName.substring(imgName.length-3, imgName.length) == "PNG")
        {
            var imgID = (img.id) ? "id='" + img.id + "' " : ""
            var imgClass = (img.className) ? "class='" + img.className + "' " : ""
            var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
            var imgStyle = "display:inline-block;" + img.style.cssText
            if (img.align == "left") imgStyle = "float:left;" + imgStyle
            if (img.align == "right") imgStyle = "float:right;" + imgStyle
            if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle
            var strNewHTML = "<span " + imgID + imgClass + imgTitle
            + " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
            + "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
            + "(src=\'" + img.src + "\', sizingMethod='scale');\"></span>"
            img.outerHTML = strNewHTML
            i = i-1
        }
    }
}
window.attachEvent("onload", correctPNG);

	<!--[if gte IE 5]>
	<style type="text/css">
		.containerClass {
			filter:progid:DXImageTransform.Microsoft.AlphaImageLoader
			(src='/pfad/zum.png');
		}
	</style>
	<![endif]-->

    <script type="text/javascript">
    <!--
    	/**
    	 * Microsoft Internet Explorer semi-transparency patch 
    	 */
		function optimizePNG()
		{
			// loop all images
			for (var i = 0; i < document.images.length; i++) {
				var img = document.images[i];
				var src = img.src;
				var ext = src.substr(src.length - 3, 3);
				// image extension png? 
				if (ext.toLowerCase() == "png") {
					// yes png!
					
					// create new container element
					var container = document.createElement("span");
					
					// transparency patch
					container.style.cssText = "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"
						+ (img.src)
						+ "', sizingMethod='scale')";
					
					// set container properties
					container.style.display = "inline-block";
					container.style.width   = img.width  + "px";
					container.style.height  = img.height + "px";
					
					// adopt link behaviour
					var par = img.parentNode;
					if (par.tagName.toLowerCase() == "a")
						container.style.cursor = "hand";
					
					// adopt title
					if (img.alt.length > 0)
						container.title = img.alt
					else if (img.title.length > 0)
						container.title = img.title;
					
					// adopt alignment
					if (img.align == "left")
						container.style.float = "left";
					else if (img.align == "right")
						container.style.float = "right";
					
					// adopt class name
					if (img.className.length > 0)
						container.className = img.className;
					
					// replace <img> with patched container
					par.replaceChild(container, img);
				}
			}
		}
		
		if (document.all && !window.opera)
			window.onload = optimizePNG;
	//-->
	</script>