code: function(basename, lan)
  	{
  		if (mxResources.loadDefaultBundle || !mxResources.isLanguageSupported(lan))
  		{
  			return basename + mxResources.extension;
  		}
  		else
  		{
  			return null;
  		}
  	}
docs: Function: getDefaultBundle
  
  Hook for subclassers to return the URL for the special bundle. This
  implementation returns basename + <extension> or null if
  <loadDefaultBundle> is false.
  
  Parameters:
  
  basename - The basename for which the file should be loaded.
  lan - The current language.