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

// parses all images //public
function pngLoadPngs()
{
	var rslt = navigator.appVersion.match(/MSIE (\d+\.\d+)/, '');
	var itsAllGood = (rslt != null && Number(rslt[1]) > 5.5);

	if (itsAllGood) {
		for (var i = 0; i < document.images.length; i++) {
			pngLoad(document.images[i]);
		}
		for (var i = 0; i < document.getElementsByTagName("input").length; i++) {
			var img = document.getElementsByTagName("input")[i];
			if(typeof img.type == "string" && img.type == "image") {
				pngLoad(img);
			}
		}
	}
}

// loads an image, src is optional // public
function pngLoad(img,src)
{
	if (typeof img == "object" && typeof img.tagName == "string" && img.tagName == "IMG")
	{
		// this is an image
		if (typeof src == "string")
		{
			// src parameter is present
			if (src.match(/\.png$/i) != null)
			{
				// this is png image
				img.style.width = null;
				img.style.height = null;
				img.style.filter = null;
				img.src = src;
				pngSwapPrepare(img);
			}
			else
			{
				// its not a png
				img.src = src;
			}
		}
		else if (img.src.match(/\.png$/i) != null)
		{
				// no src arameter, but its png -> simply swap
				pngSwapPrepare(img);
		}
	} else if (typeof img.tagName == "string" && img.tagName == "INPUT") {
		if(img.src.match(/\.png$/i) != null) {
			pngSwapPrepare(img);
		}
	}

	// swap (if complete) or shedule it to onload event // private
	function pngSwapPrepare(img)
	{
		if (img.complete)
			pngSwap(img);
		else
			img.attachEvent("onload",pngOnLoadSwap);
	}
	
	// supposed to be called when image is loaded into memory //private
	function pngOnLoadSwap()
	{
		event.srcElement.detachEvent("onload",pngOnLoadSwap);
		pngSwap(event.srcElement);
	}

	// Swaps img and background //private
	function pngSwap(img)
	{
		with (img)
		{
			style.width = width + "px";
			style.height = height + "px";
			style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" + src + "', sizingMethod='scale') ";
			src = "images/null.gif";
		}
	}
}
