Aide messagerie perso php svp!!!

<?php
session_start();
$pseudo=$_SESSION['login'];
if($pseudo !=NULL)
{ ?>
<?php include('w3c.php'); ?>
<?php include('en.php'); ?>
 <div id="menu">
<?php include('bloc.php'); ?>
 </div>
 <div id="corps">
 <?php 
 mysql_connect('localhost','root','');
 mysql_select_db('mailz');
 $retour=mysql_query('SELECT * FROM mp WHERE a="'.$pseudo.'"');
$donnees = mysql_fetch_array($retour);
$de=$donnees['de'];
$sujet=$donnees['sujet'];
$message=$donnees['message'];
?>
<p style="background-color:black;color:white;"><div style="color:red;background-color:black;">de:</div> <div style="background-color:black;color:white;"> <?php echo $de; ?></div>    <div style="color:yellow;background-color:black;">sujet:</div>  <div style="background-color:black;color:white;"><?php echo $sujet; ?></div><div style="background-color:black;color:green;">message:</div><div style="background-color:black;color:white;"><?php echo $message; ?></div></p>
 </div>
 <?php include('pied.php'); ?>
 </body>
 </html>
 <?php 
 }
 else
 {
 echo 'vous devez etre connectÈ pour voir cette page.';
 } ?>