<tr>
<td class="leftcell leftcell2"> Referral :</td>
<td><?php

$ref = '';

if (isset($_GET['member'])) {
$ref = $_GET['member'];
} else if (isset($_SESSION['referral'])){
$ref = $_SESSION['referral'];
}
echo $ref;
?>
<input type="hidden" name="referral" id="referral" value="<?php echo $ref; ?>" /></td>
</tr>
</table>