JavaScript XML IE and FireFox

Once again I’m doing a lot of JavaScript, but with XML.  I have also been tasked with getting this JS to work in FireFox and IE. 
Some of the thing I’m having to do are the following:
Load XML
Create new Node/Elements
Edit Attribute
Find Node/Element (based on XPath)
//This works with IE and FireFox
function LoadXml(xml) {
 var xmlDoc = null;
 if (window.ActiveXObject) {
  xmlDoc = new ActiveXObject("Microsoft.XMLDOM");
  xmlDoc.async = "false";
 } else if (document.implementation && document.implementation.createDocument) {
  parser = new DOMParser();
  xmlDoc = parser.parseFromString(xml, "text/xml");
 return xmlDoc;
function FindNodeOnElementAndAttribute(xmlDoc, elementName, attributeName, attributeValue) {
 var node
 var xPath = "//" + elementName + "[@" + attributeName + "=’" + attributeValue + "’]";
 if (window.ActiveXObject) {
   node = xmlDoc.selectSingleNode(xPath);
  } else if (XPathEvaluator) {
  var xpe = new XPathEvaluator();
  var nsResolver = xpe.createNSResolver(xmlDoc.ownerDocument == null ? xmlDoc.documentElement : xmlDoc.ownerDocument.documentElement);
  var results = xpe.evaluate(xPath, xmlDoc, nsResolver, XPathResult.FIRST_ORDERED_NODE_TYPE, null);
  node = results.singleNodeValue;
 return node;
XML DOM Create Nodes (
XPath Axes(
XML DOM Examples
Parsing the XML DOM
XML DOM Load Function
DevGuru – XMLDom Documentation
Using JavaScript to retrive XML in IE and FireFox
FireFox – Converting XMLObject to String
selectSingleNode and FireFox
Parsing XML in JavaScript
How do I load an XML formatted string into the DOM?

Problem retrieving string value of XML document in Firefox


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