no me guarda el numero de id de la noticia

[spolli]

La tabla comentarios
CREATE TABLE `comentarios_critico` (
`id` int(4) NOT NULL,
`nick` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`comentario` blob,
KEY `id` (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

la tabla de las noticias
CREATE TABLE `critico` (
`id` bigint(20) NOT NULL AUTO_INCREMENT,
`titulo` text CHARACTER SET latin1 NOT NULL,
`cuerpo` text CHARACTER SET latin1 NOT NULL,
`fecha` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`foto` text CHARACTER SET latin1 NOT NULL,
`titulo1` text CHARACTER SET latin1 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=18 ;