// Correctly handle PNG transparency in Win IE 5.5 or higher.
// http://homepage.ntlworld.com/bobosola. Updated 02-March-2004

function correctPNG() {
	for(var i=0; i<document.images.length; i++){
		var img = document.images[i]
		var imgName = img.src.toUpperCase()
		if (imgName.substring(imgName.length-3, imgName.length) == "PNG"){
			var imgID = (img.id) ? "id='" + img.id + "' " : ""
			var imgClass = (img.className) ? "class='" + img.className + "' " : ""
			var imgTitle = (img.title) ? "title='" + img.title + "' " : "title='" + img.alt + "' "
			var imgStyle = "display:inline-block;" + img.style.cssText 
			if (img.align == "left") imgStyle = "float:left;" + imgStyle
			if (img.align == "right") imgStyle = "float:right;" + imgStyle
			if (img.parentElement.href) imgStyle = "cursor:hand;" + imgStyle		
			var strNewHTML = "<div " + imgID + imgClass + imgTitle
			+ " style=\"font-size:xx-small;" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";"
			+ "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader"
			+ "(src=\'" + img.src + "\', sizingMethod='scale');visibility:visible;\"></div>" 
			img.outerHTML = strNewHTML;
			i = i-1
		}
	}
}

// Swap all PNGs for GIFs if lower than IE 5.5
function swapPNG(){
	for(var i=0; i<document.images.length; i++){
		var img = document.images[i]
		var imgName = img.src.toLowerCase()
		if (imgName.substring(imgName.length-3, imgName.length) == "png"){
			document.images[i].src = document.images[i].src.replace("png","gif");
		}
	}
}
//check MSIE version and correct pngs or replace with gifs accordingly
appVersion = navigator.appVersion.split(";")
appNumber = appVersion[1].substring(appVersion[1].indexOf('MSIE')+5);
if (navigator.appVersion.indexOf('MSIE')!=-1){
	if (parseInt(appNumber)<5.0){ // originally 5.5
	   window.attachEvent("onload", swapPNG);
	} else {
		window.attachEvent("onload", correctPNG);
	}
}