if (isset($_COOKIE['pafiledb_user']) && isset($_COOKIE['pafiledb_pass'])) { //If the cookie exists, do all this:
    
    $admininfo = array();
    if (checkpass($_COOKIE['pafiledb_user'], $_COOKIE['pafiledb_pass'], $admininfo)) {
        //checkpass() returned true, so the user exists
        
        //$adminloggedin is a var used throughout the script to see if someone's logged in.
        $adminloggedin = true;
        $smarty->assign('admininfo', $admininfo[0]);
        
    } else { //The cookie exists, but the user/pass don't match
...