public static function init($id, $label = 'Index'){
		if( !isset(self::$instances[$id]) ){
			self::$instances[$id] = new Toc($label, '', true);
		}
		return self::$instances[$id];
	}
public static function init($id, $label = 'Index'){
		if( !isset(self::$instances[$id]) ){
			self::$instances[$id] = new Toc($label, '', true);
		}
		return self::$instances[$id];
	}
public static function init ( $ id , $ label = 'Index' ) { if ( ! isset ( self :: $ instances [ $ id ] ) ) { self :: $ instances [ $ id ] = new Toc ( $ label , '' , true ) ; } return self :: $ instances [ $ id ] ; }
Initialize toc element

@param string $id
@param string $label

@return mixed
Initialize toc element