Foutmelding bij oproepen id?

<?php 

 mysql_connect("mysql.your.name", "housemd", ""); 
mysql_select_db("housemd"); 

$res = mysql_query("SELECT * FROM film WHERE id='". $id ."'"); 
while ($arr = mysql_fetch_assoc($res)) { 

if(isset($_GET['id']) && is_numeric($_GET['id']))
{
    $id = $_GET['id'];
}
else
{
    $id = 1;    
}
?><? echo $arr["naam"]." "; ?>
<? } ?>

<?php 
 
 mysql_connect("mysql.your.name", "housemd", ""); 
mysql_select_db("housemd"); 
 
$res = mysql_query("SELECT * FROM film WHERE id='". $id ."'"); 
while ($arr = mysql_fetch_assoc($res)) { 
 
if(isset($_GET['id']) && is_numeric($_GET['id']))
{
    $id = $_GET['id'];
}
else
{
    $id = 1;    
}
?><? echo $arr["naam"]." "; ?>
<? } ?>