Something

$p = $_GET['p'];
if ($p == '') $p = 1;
print "<br>p : $p";
print "<br>nb_page $nb_page";
$limite = $p * 7;
$limite2 = $limite - 7;
print "<br>limite $limite";
print "<br>limite2 $limite2";
$sql = "SELECT * FROM liens LIMIT ".$limite2.",".$limite;