pngbehavior.htc
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pngbehavior.htc
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	<public:component>
	<public:attach event="onpropertychange" onevent="propertyChanged()" />
	<script>

	var supported = /MSIE (5\.5)\|[6789]/.test(navigator.userAgent) && navigator.platform == "Win32";
	var realSrc;
	var blankSrc = "skins/default/images/blank.gif";

	if (supported) fixImage();

	function propertyChanged() {
	if (!supported) return;

	var pName = event.propertyName;
	if (pName != "src") return;
	// if not set to blank
	if ( ! new RegExp(blankSrc).test(src))
	fixImage();
	};

	function fixImage() {
	// get src
	var src = element.src;

	// check for real change
	if (src == realSrc) {
	element.src = blankSrc;
	return;
	}

	if ( ! new RegExp(blankSrc).test(src)) {
	// backup old src
	realSrc = src;
	element._original_src = realSrc;
	}

	// test for png
	if ( /\.png$/.test( realSrc.toLowerCase() ) ) {
	// set blank image
	element.src = blankSrc;
	// set filter
	element.runtimeStyle.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(src='" +
	src + "',sizingMethod='crop')";
	}
	else {
	// remove filter
	element.runtimeStyle.filter = "";
	}
	}

	</script>
	</public:component>