/**
  * set a new current skin
  * 
  * @param	string		skin id
  */
 public static function setCurrentSkin($a_skin)
 {
     global $styleDefinition;
     if (is_object($styleDefinition) and $styleDefinition->getTemplateId() != $a_skin) {
         $styleDefinition = new ilStyleDefinition($a_skin);
         $styleDefinition->startParsing();
     }
     self::$current_skin = $a_skin;
 }