l'erreur que j'ai est la suivante :
( SELECT n.id AS news_id
      , n.date
      , n.author
      FROM phpwebgallery_news_group_access AS nga
      INNER JOIN phpwebgallery_news_translation AS ntt ON ntt.id = nga.new_id
      INNER JOIN phpwebgallery_news AS n ON n.id = ntt.news_id
      INNER JOIN phpwebgallery_user_group AS ug ON ug.group_id = nga.group_id
      WHERE ug.user_id = 1
      AND ntt.language = 'fr_FR.iso-8859-1')
      UNION DISTINCT
      ( SELECT pn.id AS news_id
      , pn.date
      , pn.author
      FROM phpwebgallery_news_translation AS nt
      INNER JOIN phpwebgallery_news AS pn ON pn.id = nt.news_id
      WHERE nt.status = 'public'
      AND nt.language = 'fr_FR.iso-8859-1')
      ORDER BY date DESC
LIMIT 3
;
[mysql error 1146] Table 'marchesfi.phpwebgallery_news_group_access' doesn't exist

C'est ça :
#-----[ SQL ]------------------------------------------
#
--
-- Structure de la table `phpwebgallery_news`
--

CREATE TABLE `phpwebgallery_news` (
  `id` smallint(5) unsigned NOT NULL auto_increment,
  `date` datetime NOT NULL default '0000-00-00 00:00:00',
  `author` varchar(255) collate latin1_general_ci default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;

-- --------------------------------------------------------

--
-- Structure de la table `phpwebgallery_news_group_access`
--

CREATE TABLE `phpwebgallery_news_group_access` (
  `group_id` smallint(5) unsigned NOT NULL default '0',
  `new_id` smallint(5) unsigned NOT NULL default '0',
  PRIMARY KEY  (`group_id`,`new_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;

-- --------------------------------------------------------

--
-- Structure de la table `phpwebgallery_news_translation`
--

CREATE TABLE `phpwebgallery_news_translation` (
  `id` smallint(6) unsigned NOT NULL auto_increment,
  `news_id` smallint(5) unsigned NOT NULL default '0',
  `language` varchar(50) collate latin1_general_ci NOT NULL default 'en_UK.iso-8859-1',
  `title` varchar(75) collate latin1_general_ci default NULL,
  `content` longtext collate latin1_general_ci,
  `status` enum('public','private') collate latin1_general_ci NOT NULL default 'public',
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;

-- --------------------------------------------------------

--
-- Insertion des données`
--

INSERT INTO `phpwebgallery_news` ( `id` , `date` , `author` ) VALUES ('1', NOW(), 'DPDev');

INSERT INTO `phpwebgallery_news_translation` ( `news_id` , `language` , `title` , `content`, `status`  )
VALUES ('1', 'en_UK.iso-8859-1', 'PWG News system installed', 'Congratulation ! The news system for PWG has been installed!', 'public');

INSERT INTO `phpwebgallery_news_translation` ( `news_id` , `language` , `title` , `content`, `status` )
VALUES ('1', 'fr_FR.iso-8859-1', 'Système de News PWG installé', 'Félicitation ! Le système de News pour PWG a été installé!', 'public');

#
#-----[ SQL FIN]------------------------------------------

Désolé je ne vois pas trop ce qui faut faire je n'ai jamais fait de SQL dans ma vie. : (
Faut que je créé trois pages PHP supplémentaires ??

Arrrrrfff   YYYYYEEEESSS

C'était un peu périlleux sachant que je n'avais jamais mis les pieds dans PHPMyAdmi mais c'est bon j'ai réussi !!!

Merccciiiiiiii beaucoup