Php + mysql + login probleme

Bonjour,

Je bloc sur le problème suivant. j'ai beau regardé sur le web, je trouve pas de solution encore.

j'ai les messages suivant lorsque je test mon login et password


Warning: session_register(): Cannot send session cookie - headers already sent by (output started at /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php:9) in /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php on line 45

Warning: session_register(): Cannot send session cache limiter - headers already sent (output started at /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php:9) in /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php on line 45

Warning: Cannot modify header information - headers already sent by (output started at /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php:9) in /var/www/data/woo/C/C/8/A/CC8AA43K/lhm/checkpoint.php on line 47

Voici le code de la page checkpoint

<?php

$host="localhost"; // Host name
$username="root"; // Mysql username
$password="non"; // Mysql password
$db_name="CC8AA43K1"; // Database name
$tbl_name="connection"; // Table name

// Connect to server and select databse.
mysql_select_db("$db_name")or die("cannot select DB");

// username and password sent from form1
$myusername = $_POST['myusername'];
$mypassword = $_POST['mypassword'];

// To protect MySQL injection (more detail about MySQL injection)
$myusername = stripslashes($myusername);
$mypassword = stripslashes($mypassword);
$myusername = mysql_real_escape_string($myusername);
$mypassword = mysql_real_escape_string($mypassword);

$sql="SELECT * FROM $tbl_name WHERE username='$myusername' and password='$mypassword'";
$result=mysql_query($sql);

// Mysql_num_row is counting table row
$count=mysql_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row

if($count == 1)
{
// Register $myusername, $mypassword and redirect to file "login_success.php"
session_register("myusername");
session_register("mypassword");
header("location:administration.php");
}
else
{
echo "Wrong Username or Password";
}
?>

le probleme vient de ces lignes :

session_register("myusername");
session_register("mypassword");
header("location:administration.php");

mais je ne vois pas comment les modifier si c'est le cas.

si joint la page de login : http://www.premiumwanadoo.com/ao1teamdod/lhm/login.php j'ai mis bilo / watcher en log/pas par default.

D'avance merci pour votre aide.

Configuration: Windows XP
Firefox 2.0.0.14