Stuff

 $query3 = $mysql->query("SELECT * FROM ".$mysql->pref2."_notification WHERE message_id='$id'");
   $pseudo2 = mysql_result($query3,0,"pseudo");
   $auto = mysql_result($query3,0,"auto");
   
  if(!empty($notification) && $pseudo2 == null ){
   $emailquery = $mysql->query("SELECT * FROM ".$mysql->pref2."_membres WHERE pseudo='$pseudo'");
   $email = mysql_result($emailquery,0,"mail");
 
   $mysql->query("INSERT INTO ".$mysql->pref2."_notification
                        (id, message_id, pseudo, titre, mail)
                  VALUES('', '$id', '$pseudo', '$titre', '$email')");}
                                  
                                  else{
                                  
                                   $mysql->query("DELETE FROM ".$mysql->pref2."_notification WHERE pseudo='$pseudo' AND titre='$titre'");
                                  
                                  }