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XML GetChildNode Via NodeName

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   Function: getChildNodeName

       Cycle through the child nodes and find the first instance of the name.

XMLNode.prototype.getChildNodeName = function(nName) {
   for (var i=0; i<this.childNodes.length; i++) {
      var tChild = this.childNodes[i];
      if (tChild.nodeName === nName) {
         return tChild;
   return null;