redirectionner une session

j'utilise un gestionnaire de session. Lors de la destruction automatique de la session j'aimerais rediriger l'utilisateur vers une page ou il devra rentrer ses parametres de connection à nouveau.
Voici le code du gestionnaire de session:

Code:

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$SESS_DBHOST = "localhost";            /* database server hostname */ 
$SESS_DBNAME = "mabase";    /* database name */ 
$SESS_DBUSER = "root";            /* database user */ 
$SESS_DBPASS = "";                    /* database password */ 
 
$SESS_DBH = ""; 
//$SESS_LIFE = get_cfg_var("session.gc_maxlifetime"); 
$SESS_LIFE = 3600; 
 
function sess_open($save_path, $session_name) { 
    global $SESS_DBHOST, $SESS_DBNAME, $SESS_DBUSER, $SESS_DBPASS, $SESS_DBH; 
 
    if (! $SESS_DBH = mysql_pconnect($SESS_DBHOST, $SESS_DBUSER, $SESS_DBPASS)) { 
        echo "<li>Can't connect to $SESS_DBHOST as $SESS_DBUSER"; 
        echo "<li>MySQL Error: ", mysql_error(); 
        die; 
    } 
 
    if (! mysql_select_db($SESS_DBNAME, $SESS_DBH)) { 
        echo "<li>Unable to select database $SESS_DBNAME"; 
        die; 
    } 
 
    return true; 
} 
 
function sess_close() { 
    return true; 
} 
 
function sess_read($key) { 
    global $SESS_DBH, $SESS_LIFE; 
    $qry = "SELECT value FROM sessions WHERE sesskey = '$key' AND expiry > " . time(); 
    $qid = mysql_query($qry, $SESS_DBH); 
    if (list($value) = mysql_fetch_row($qid)) return $value; 
    return false; 
} 
 
function sess_write($key, $val) { 
    global $SESS_DBH, $SESS_LIFE; 
    $expiry = time() + $SESS_LIFE; 
    $value = addslashes($val); 
    $qry = "UPDATE sessions SET expiry = $expiry, value = '$value' WHERE sesskey = '$key'"; // AND expiry > " . time(); 
    $qid = mysql_query($qry, $SESS_DBH); 
    if(mysql_affected_rows()<1) { 
        $qry = "INSERT INTO sessions (sesskey, expiry, value) VALUES ('$key', $expiry, '$value')"; 
        $qid = mysql_query($qry, $SESS_DBH);        
    } 
    return $qid; 
} 
 
function sess_destroy($key) { 
    global $SESS_DBH; 
    $qry = "DELETE FROM sessions WHERE sesskey = '$key'"; 
    $qid = mysql_query($qry, $SESS_DBH); 
    return $qid; 
} 
 
function sess_gc($maxlifetime) { 
    global $SESS_DBH; 
    $qry = "DELETE FROM sessions WHERE expiry < " . time(); 
    $qid = mysql_query($qry, $SESS_DBH); 
    return mysql_affected_rows($SESS_DBH); 
} 
 
session_set_save_handler( 
    "sess_open", 
    "sess_close", 
    "sess_read", 
    "sess_write", 
    "sess_destroy", 
    "sess_gc");

merci