define('NUM_PER_PAGE', 100);

$p = (isset($_GET['p']) ? abs(intval($_GET['p'])) : 1);
$total = 0;
$result = $db->query('SELECT COUNT(id) AS total FROM tabl1') or die($db->error);
if ($row = $result->fetch_assoc()) {
    $total = $row['total'];
}
$numPages = ($total ? ceil($total / NUM_PER_PAGE) : 0);
$p = (!$p ? 1 : ($p > $numPages ? $numPages : $p));
$result = $db->query('SELECT kod1, text1 FROM tabl1 LIMIT ' . ($p - 1) * NUM_PER_PAGE . ', ' . NUM_PER_PAGE) or die($db->error);
echo '<table>';
while ($row = $result->fetch_assoc()) {
    echo '<tr>';
    echo '<td>' . htmlspecialchars($row['kod1']) . '</td>';
    echo '<td>' . htmlspecialchars($row['text1']) . '</td>';
    echo '</tr>';
}
echo '<table>';
for ($i = 1; $i <= $numPages; $i++) {
    echo '<a href="' . $_SERVER['PHP_SELF'] . '?p=' . $i . '">' . $i . '</a> ';
}

$db = new mysqli(CFG_DB_HOST, CFG_DB_USER, CFG_DB_PASSWORD, CFG_DB_NAME);
if ($db->connect_errno) {
    die('The website is temporarily unavailable. Please try later.');
}    

echo '<a href=".......">' . htmlspecialchars($row['nsubj']) . '</a>';

<script type="text/javascript">
var vibor = '';
function selectSubj(nfile) {
    vibor = nfile;
}
</script>

<?php
........
echo '<a href="javascript:selectSubj(' . htmlspecialchars($row['nfile']) . ')">' . htmlspecialchars($row['nsubj']) . '</a>';
........
?>

echo '<a href="javascript:selectSubj(\'' . htmlspecialchars($row['nfile']) . '\')">' . htmlspecialchars($row['nsubj']) . '</a>';