fixIE8Alpha.js

// img elems
if(typeof window.addEventListener == 'undefined' && typeof document.getElementsByClassName == 'undefined') {
	$('img').each(function() {
		var $this = $(this),
			src = $this.attr('src');
		if(src.indexOf('.png') != -1) {
			$this.css({
				'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="' + src + '", sizingMethod="scale");'
			});
		}
	});
}

fixIE8AlphaBG.html

<!--[if IE 8]>
<script>
	// CSS background
	$(function () {
		var exp = /url\(["']*(.*?)["']*\)/;
		$(".pngfix").each(function (i, el) {
			var $this = $(this),
			src = $this.css("background-image").replace(exp, "$1");
			$this.css({
				backgroundImage: "none",
				filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale')"
			});
		});
	});
</script>
<![endif]-->