ALTER TABLE `bb_users` ADD `curpage_topic` mediumint(8) NOT NULL default '0';
ALTER TABLE `bb_users` ADD `curpage_topic_time` int(11) NOT NULL default '0';

// Start session
 $user->session_start();

$user_id = $userdata['user_id'];
 if ($user_id > 0)
 {
   if ($userdata['user_allow_viewonline'] > 0)
   {
     $sql = "UPDATE " . USERS_TABLE . "
     SET curpage_topic = $topic_id, curpage_topic_time = ".time()."
     WHERE user_id = $user_id";
     if ( !($result = $db->sql_query($sql)) )
     {
       message_die(GENERAL_ERROR, 'Could not update users table', '', __LINE__, __FILE__, $sql);
     }
   }
   $sql = "SELECT username, user_id, curpage_topic_time, user_timezone
       FROM " . USERS_TABLE . "
       WHERE curpage_topic = $topic_id
       AND (curpage_topic_time > ".( time() - 300 ).")";
   if($result = $db->sql_query($sql))
   {
     $looking_list = '';
     while ($row = $db->sql_fetchrow($result))
     {
       $looking_time = create_date('H:i:s', $row['curpage_topic_time'], $row['user_timezone']);
       $looking_list .= ' &nbsp;<a title="'.$looking_time.'" class="gen" href="profile.php?mode=viewprofile&u='.$row['user_id'].'">'.$row['username'].'</a>';
     }
     $template->assign_vars(array(
       'LOOKING_LIST' => $lang['WHOIS_LOOKING'] . ':&nbsp; ' . $looking_list,
     ));
   }
 }

$lang['WHOIS_LOOKING'] = 'Кто просматривает тему';

{LOOKING_LIST}