Parse error

Hej eksperter, nogen der kan se hvorfor jeg får følgene parserror :

Parse error: parse error, expecting `T_STRING' or `T_VARIABLE' or `T_NUM_STRING' in /home/chris/public_html/succes.php on line 13

mit script ser således ud :
<?
session_start();
$host = "localhost";
$user = "xxxxx";
$pass = "xxxxxxx";
$dbname = "xxxxx";
$mdpassword = md5($_SESSION['password']);

$connection = mysql_connect($host,$user,$pass) or die (mysql_errno().": ".mysql_error()."<BR>");
mysql_select_db($dbname);

mysql_query("INSERT INTO `user` ( `name` , `username` , `password` , `email` , `refuser` , `value` , `payment`)
VALUES('$_SESSION['name']', '$_SESSION['username']', '$mdpassword', '$_SESSION['email']', '$_SESSION['refuser']', '50', 'approved')")or die (mysql_error());
echo "succes";

?>