//load xml document 加?XML文件
    function _loadXmlDocument(xmlFilePath)
    {
      var _xmlDoc = null;
      if (!window.DOMParser && window.ActiveXObject)
      {
        var xmlDomVersions = ['MSXML2.DOMDocument.6.0','MSXML2.DOMDocument.3.0','Microsoft.XMLDOM'];
        for (var i = 0; i < xmlDomVersions.length; i++)
        {
          try
          {
            _xmlDoc = new ActiveXObject(xmlDomVersions[i]);
			_xmlDoc.async = false;		
	        _xmlDoc.load(xmlFilePath);
            break;
          }
          catch(e){}
        }
      }
      else if (document.implementation && document.implementation.createDocument)
      {
        try
        {
          //_xmlDoc = document.implementation.createDocument('','',null);
		  xmlhttp=new XMLHttpRequest();
		  xmlhttp.open("GET",xmlFilePath,false);
		  xmlhttp.send();
          _xmlDoc=xmlhttp.responseXML; 
		  //var parser=new DOMParser();
		  //var oSerializer = new XMLSerializer();

    	  //_xmlDoc = oSerializer.serializeToString(xmltxt);


//		  _xmlDoc=parser.parseFromString(xmltxt,"text/xml");
        }
        catch(e){}
      }

      if (_xmlDoc != null)
      {
      	return _xmlDoc;
      }
	  else
	  {
		  alert("Load XML File Error!");
	  }      
    }

    //load xml string 加? XML 字符串
    function _loadXmlString(xmlString)
    {
      var _xmlDoc = null;
      if (!window.DOMParser && window.ActiveXObject)
      {
        var xmlDomVersions = ['MSXML2.DOMDocument.6.0','MSXML2.DOMDocument.3.0','Microsoft.XMLDOM'];
        for (var i = 0; i < xmlDomVersions.length; i++)
        {
          try
          {
            _xmlDoc = new ActiveXObject(xmlDomVersions[i]);
            _xmlDoc.async = false;
            _xmlDoc.loadXML(xmlString);
            break;
          }
          catch(e){}
        }
      }
      else if (window.DOMParser && document.implementation && document.implementation.createDocument)
      {
        try
        {
          domParser = new  DOMParser();		  
          _xmlDoc = domParser.parseFromString(xmlString, 'text/xml');		  
        }
        catch(e){}
      }

      return _xmlDoc;
    }