/*
 
Correctly handle PNG transparency in Win IE 5.5 & 6.
http://homepage.ntlworld.com/bobosola. Updated 18-Jan-2006.

Use in <HEAD> with DEFER keyword wrapped in conditional comments:
<!--[if lt IE 7]>
<script defer type="text/javascript" src="pngfix.js"></script>
<![endif]-->

*/

var arVersion = navigator.appVersion.split("MSIE");
var version = parseFloat(arVersion[1]);

function correctPNG() { // correctly handle PNG transparency in Win IE 5.5 and 6.
	if ((version >= 5.5) && (document.body.filters)) {
		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 ;
				var imgAttribs = img.attributes;
				
				for (var j=0; j<imgAttribs.length; j++) {
					var imgAttrib = imgAttribs[j];
					if (imgAttrib.nodeName == "align") {		  
						if (imgAttrib.nodeValue == "left") { imgStyle = "float:left;" + imgStyle; }
						if (imgAttrib.nodeValue == "right") { imgStyle = "float:right;" + imgStyle; }
						break;
					}
				}
				
				var strNewHTML = "<span " + imgID + imgClass + imgTitle;
				strNewHTML += " style=\"" + "width:" + img.width + "px; height:" + img.height + "px;" + imgStyle + ";";
				strNewHTML += "filter:progid:DXImageTransform.Microsoft.AlphaImageLoader";
				strNewHTML += "(src='" + img.src + "', sizingMethod='scale');\"";
				if (img.onmouseover!=null) {
				strNewHTML += " onmouseover=\"PNGswap('" + img.id + "');\" onmouseout=\"PNGswap('" + img.id +"');\"";
				}
				strNewHTML += "></span>";
				img.outerHTML = strNewHTML;
				i = i-1;
			}
		}
	}
}
window.attachEvent("onload", correctPNG);

function PNGswap(myID) {
	var strOver  = "_on";
	var strOff = "_off";
	var oSpan = document.getElementById(myID);
	var currentAlphaImg = oSpan.filters(0).src;
	
	if (currentAlphaImg.indexOf(strOver) != -1) {
		oSpan.filters(0).src = currentAlphaImg.replace(strOver,strOff);
	} else {
		oSpan.filters(0).src = currentAlphaImg.replace(strOff,strOver);
	}
}


