function replacePNGs() {

	imgs = document.getElementsByTagName('img');

	for(i = 0;i < imgs.length;i++) {

		img = imgs[i];

		if(img.getAttribute('src', false).match(/\.png$/i) && navigator.userAgent.match(/MSIE\s+(5.5|6.0)/i)) {

			newSpan = document.createElement("span");

		  	img.parentNode.insertBefore(newSpan, img);

		  	newSpan.style.width = img.offsetWidth + 'px';

		  	newSpan.style.height = img.offsetHeight + 'px';

		  	newSpan.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + img.getAttribute('src', false) + "', sizingMethod='crop', enabled=true)";
			
			newSpan.style.display = 'block';

		  	img.style.display = 'none';

		}

	}

}

window.onload = replacePNGs;