[PHP] envoyer POST data avec <a href,,,>

<p id="col1">A-B</p>
<?php
}
// colone 1
$reponse = $bdd->query('SELECT * FROM membre 
WHERE nom LIKE \'a%\' OR nom LIKE \'b%\'
ORDER BY nom ASC LIMIT 0,20');
while ($donnee = $reponse -> fetch())
{
?>
<form id="mail" method="post" action="page2.php">
<ul id="col1" class="no_decoration">
<li>
<a class="hover" href="#" onclick='document.getElementById("mail").submit()'>
<input type="hidden" name="mail" value="<?php echo $donnee['mail']; ?>"/>
<?php echo $donnee['nom'].' '; ?><?php echo $donnee['prenom']; ?></a>
</li>
</ul>
</form>
<?php
}
{
?>

<?php
if (isset($_POST) AND $_POST['mail']!="")
{
$dos = "uploads/$_POST[mail]/min/";
$dir = opendir($dos);
while($_FILES = readdir($dir))
{
$allow_ext = array("jpg","png","gif");
$ext = strtolower(substr($_FILES,-3));
if(in_array($ext,$allow_ext))
{
?>
<a href="ma_collection_detail.php">
<img src="uploads/<?php echo $_POST['mail']?>/min/<?php echo $_FILES; ?>"/></a>
<?php
}
}

else
{
if($_POST['mail']="")
$dos = "uploads/$_SESSION[mail]/min/";
$dir = opendir($dos);
while($_FILES = readdir($dir))
{
$allow_ext = array("jpg","png","gif");
$ext = strtolower(substr($_FILES,-3));
if(in_array($ext,$allow_ext))
{
?>
<a href="ma_collection_detail.php">
<img src="uploads/<?php echo $_SESSION['mail']?>/min/<?php echo $_FILES; ?>"/></a>
<?php
}
}
?>