$num = 15;
$page = intval($_GET['page']);
               
$result_page = mysql_query("SELECT COUNT(*) FROM post");
$temp_page = mysql_fetch_array($result_page);
$posts_page = $temp_page[0];
               
$total = intval(($posts_page - 1) / $num) + 1;
$page = intval($page);
               
if(empty($page) or $page < 0) $page = 1;
if($page > $total) $page = $total;
$start = $page * $num - $num;