Навигация на Mysql

<?
define('TOPAGE',10);
$page=(int)$_GET['page'];
   
   $q=mysql_result(mysql_query("SELECT COUNT(*) FROM `users`"),0);
    
    $total = intval(($all - 1) / TOPAGE) + 1;
    
	if(empty($page) or $page < 0) $page = 1;
    
	if($page > $total) $page = $total;
    
	$start = $page * TOPAGE -TOPAGE;

	$g=mysql_query("SELECT * FROM `users`  LIMIT $start,".TOPAGE."");

//тут вывод содержимого
        if ($page != $total) $nextpage = ' <a href= users.php?page='. ($page + 1) .'>>></a>';
      if($page - 1 > 0) $pageback = '<a href= users.php?page='. ($page - 1) .'>'. ($page - 1) .'</a> ';
?>