// Universal transparent-PNG enabler for MSIE/Win 5.5+
// http://dsandler.org
// From original code: http://www.youngpup.net/?request=/snippets/sleight.xml
// and background-image code: http://www.allinthehead.com/retro/69
// also:
//  * use sizingMethod=crop to avoid scaling PNGs (who would do such a thing?)
//  * only do this once, to make it compatible with CSS rollovers

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

function enableAlphaImages()
{
	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.all.length; i++)
		{
			var obj = document.all[i];
			var bg = obj.currentStyle.backgroundImage;
			var img = document.images[i];
			if (bg && bg.match(/\_tra.png/i) != null)
			{
				sizingMethod = 'crop';
					if(bg.match("_scale"))
						sizingMethod = 'scale';
						
				var img = bg.substring(5,bg.length-2);
				var offset = obj.style["background-position"];
				obj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+img+"', sizingMethod='"+sizingMethod+"')";
				obj.style.backgroundImage = "url('blank.gif')";
				obj.style["background-position"] = offset; // reapply
			} 
			else 
				if (img && img.src.match(/\_tra.png$/i) != null) 
				{
					
					sizingMethod = 'crop';
					if(img.src.match("_scale"))
						sizingMethod = 'scale';
					var src = img.src;
					img.style.width = img.width + "px";
					img.style.height = img.height + "px";
					img.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+src+"', sizingMethod='"+sizingMethod+"')"
					img.src = "blank.gif";
				}		
		}
	}
}