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function ParseData( str )
{
   var domParser = new DOMParser();
   if ( domParser )
   {
      var fragment = null;
      if ( null == doc )
      {
        fragment = domParser.parseFromString( str, 'text/xml' );
      }
      else
      {
         fragment = domParser.parseFromString( str, 'text/xml' );
         try
         {
            fragment = doc.importNode( fragment, true );
         }
         catch(er){alert(er)}
      }
      return fragment;
   }
   return null;
};