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Вот этот код правильно? Страница навигации

$count = @ mysql_result(mysql_query('SELECT COUNT(*) FROM `groups_cat`'), 0);
if($count>0)
{
$res = mysql_query('SELECT * FROM `groups_cat` ORDER BY `id` ASC LIMIT ' . $start . ',' . $kmess);
while ($row = mysql_fetch_assoc($res))
{
echo ($i % 2) ? '<div class="list1">':'<div class="list2">';
$countg = @ mysql_result(mysql_query('SELECT COUNT(*) FROM `groups` WHERE `ref`='.$row['id'].''.($rights == 9 ? '':' AND `mod`=0').''), 0);
echo '<a href="?do=cat&amp;id='.$row['id'].'">' . htmlentities($row['name'], ENT_QUOTES, 'UTF-8').'</a> (' . $countg . ')';
echo '<div class="sub">'.htmlentities($row['text'], ENT_QUOTES, 'UTF-8').'</div>';
echo '</div>';
++$i;
}
echo '<div class="phdr">Всего: ' . $count . '</div>';
if ($count > $kmess) {
    echo '<p class="menu">' . pagenav('index.php?', $start, $count, $kmess) . '<br />';
echo '<form action="" method="post">
<input type="text" name="page" size="2"/>
<input type="submit" value="Перейти"/>
</form></p>';
}
}