function chats_upgrade($nom_meta_base_version, $version_cible){
	$current_version = "0.0";

	if ($current_version=="0.0") {
		creer_base();
		ecrire_meta($nom_meta_base_version, $current_version=$version_cible);
	}
	if (version_compare($current_version,"1.1","<")){
		// ajout du champ "robe" et "infos"
		maj_tables('spip_chats');
		ecrire_meta($nom_meta_base_version,$current_version="1.1");
	}
}