function addNode() {
  var xmlDoc = new ActiveXObject("Msxml2.DOMDocument");
  var MyNode;
  var namedNodeMap;
  xmlDoc.async = false;
  xmlDoc.load("mydvd.xml");
  alert(xmlDoc.documentElement.xml);
  MyNode = xmlDoc.createNode("attribute", "Year", "");
  namedNodeMap = xmlDoc.documentElement.childNodes.item(0).attributes;
  namedNodeMap.setNamedItem(MyNode);
  alert(xmlDoc.documentElement.xml);
}

  xmlDoc.documentElement;

  xmlDoc.documentElement.childNodes

  xmlDoc.documentElement.childNodes.item(0)

  xmlDoc.documentElement.childNodes.item(0).attributes

 
  xmlDoc.documentElement.childNodes.item(0).attributes.setNamedItem(MyNode)

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