/**
  * Load version-specific installer.
  *
  * @access public
  * @param string $class The class to load.
  * @param string $path
  * @return modInstallVersion
  */
 public function loadVersionInstaller($class = 'modInstallVersion', $path = '')
 {
     $className = $this->install->loadClass($class, $path);
     if (!empty($className)) {
         $this->versioner = new $className($this);
         return $this->versioner;
     } else {
         $this->install->_fatalError($this->install->lexicon('versioner_err_nf', array('path' => $path)));
     }
     return $this->versioner;
 }