//Chat
IF(isset($_POST['pseudo']) AND isset($_POST['message']))
{
  IF($_POST['pseudo'] != NULL AND $_POST['message'] != NULL)
  {
    $precs = mysql_query("SELECT * FROM chat ORDER BY id DESC LIMIT 0,1");
    $prec = mysql_fetch_array($precs);
    IF($_POST['message'] != $prec['message'])
      $pseudo = htmlentities ($_POST['pseudo']);
      $message = htmlentities ($_POST['message']);
      mysql_query("INSERT INTO chat VALUES('', '$pseudo', '$message')");
  }
}
  $chats = mysql_query("SELECT * FROM chat ORDER BY id DESC LIMIT 0,30");
  WHILE($chat = mysql_fetch_array($chats));
{
?>
<table class="punspacer">
  <tr class="punhead">
    <td colspan="2"><b> <?php echo $chat['pseudo']; ?> :</b> <?php echo $chat['message']; ?> </td>
  </tr>
<?php
 }
?>
<form method="post" action="index.php">
  <tr>
    <td>Pseudo</td>
    <td><input type="text" name="pseudo" maxlength="10" /></td>
  </tr>
  <tr>
    <td>Message</td>
    <td><input type="text" name="message" maxlength="200" /></td>
  </tr>
  <tr>
    <td><input type="reset" name="Effacer" /></td>
    <td><input type="submit" name="Envoyer" /></td>
  </tr>
</form>
</table>

{
ECHO"
<table class='punspacer'>
  <tr colspan='2'>
    <td><b>{$chat['pseudo']} :</b> {$chat['message']}</td>
  </tr>";
 } ?>

{
?>
<table class='punspacer'>
  <tr colspan='2'>
    <td><b> <?php echo $chat['pseudo']; ?> :</b> <?php echo $chat['message']; ?> </td>
  </tr>
<?php
 }
?>