/**
  * get the current style
  *
  * use always this function instead of getting the account's style
  * the current style may be changed on the fly by setCurrentStyle()
  * @return	string	style id
  */
 public static function getCurrentMasterStyle()
 {
     global $ilias;
     if (isset(self::$current_master_style)) {
         return self::$current_master_style;
     }
     $cs = $ilias->account->prefs['style'];
     self::$current_master_style = $cs;
     return $cs;
 }