Постраничная навигация

<?
$sql=mysql_query("SELECT * FROM auk");
$auk=mysql_fetch_array($sql);
$auk=unserialize($auk[bag]);
if (empty($auk)){echo"<br>Пусто.";}
else{
for ($i=0;$i<sizeof($auk);$i++){echo"<br>Вывод.";}
}
?>

<?php
$on_page = 10;
if(isset($_GET['page'])){
$page = abs(intval($_GET['page']));
}else{
$page = '1';
}
$p_str = $on_page*$page-$on_page;
$sql = mysql_query("SELECT * FROM `auk` ORDER BY `id` ASC  LIMIT $p_str,$on_page");
$pag  = mysql_num_rows(mysql_query("SELECT * FROM `auk`"));
if($pag>0) {
$n = $p_str;
while($auk = mysql_fetch_array($sql)){
$n++;
echo " $n ".$auk['msg']."<br>";
}
}
$str = ceil($pag/$on_page);
if($page>1)echo "<a href='index.php?page=".($page-1)."'>Назад</a> | Далее";
if($page<$str)echo "Назад | <a href='index.php?page=".($page+1)."'>Далее</a>";
?>