Hello all. I have modifed the article from here on user authentication to include cookies so the user does not have to log in each visit of the site. The problem is, I can't figure out how to let them logout. Here is the source code of the two files.

auth.php (included in each file)
PHP Code:
<?
session_start
();

$uid = isset($_COOKIE['uid']) ? $_COOKIE['uid'] : $_SESSION['uid'];
$pwd = isset($_COOKIE['pwd']) ? $_COOKIE['pwd'] : $_SESSION['pwd'];

$_SESSION['uid'] = $uid;
$_SESSION['pwd'] = $pwd;

$sql "SELECT * FROM info WHERE charname = '$uid' AND pass = '$pwd'";
$result mysql_query($sql);
        
$r mysql_fetch_array($result); 
        
$pre $r["premium"];

if (!
$result) {
    echo 
"A database error occurred while checking your login details!";
    echo 
mainFooter();
    exit;
}

?>
logout.php
PHP Code:
<?
    session_start
();
    
session_unregister('uid'); 
    
session_unregister('pwd');
    
setcookie ("uid"""mktime(12,0,0,111990));
    
setcookie ("pwd"""mktime(12,0,0,111990));
    
session_destroy(); 
    unset(
$uid); 
    unset(
$pwd);

    
header("Location: http://www.eqsig.com");
?>
After the logout file redirects me to the homepage, it shows i am still logged in.