Image vers 4 liens - fleche suivant

<div id="principal">

<a href="presentation1.php?hide=1">01</a>
<a href="presentation1.php?hide=2">02</a>
<a href="presentation1.php?hide=3">03</a>
<a href="presentation1.php?hide=4">04</a>

<?php
if (isset($_GET['hide']) && $_GET['hide'] == 1) {
include 'img01.php';
}
?>
<?php
if (isset($_GET['hide']) && $_GET['hide'] == 2) {
include 'img02.php';
}
?>
<?php
if (isset($_GET['hide']) && $_GET['hide'] == 3) {
include 'img03.php';
}
?>
<?php
if (isset($_GET['hide']) && $_GET['hide'] == 4) {
include 'img04.php';
}
</div>