function getusrinfo($user) {
    global $user_prefix, $db, $userinfo;
    static $userrow;
    if (!$user || $user == '') { return NULL; }
    if(!is_array($user)) {
        $user = base64_decode($user);
        $user = explode(":", $user);
    }
    if (is_array($userrow)) {
        if ($userrow['username'] == $user[1] && $userrow['user_password'] = $user[2]) {
            return $userrow;
        }
    }
    $sql = "SELECT * FROM ".$user_prefix."_users WHERE username='$user[1]' AND user_password='$user[2]'";
    $result = $db->sql_query($sql);
    if ($db->sql_numrows($result) == 1) {
        $userrow = $db->sql_fetchrow($result);
        return $userinfo = $userrow;
    }
    unset($userinfo);
}

function cookiedecode($user) {
    global $cookie, $db, $user_prefix;
    static $pass;
    if(!is_array($user)) {
        $user = base64_decode($user);
        $cookie = explode(":", $user);
    } else {
        $cookie = $user;
    }
    if (!isset($pass)) {
       $sql = "SELECT user_password FROM ".$user_prefix."_users WHERE username='$cookie[1]'";
       $result = $db->sql_query($sql);
       list($pass) = $db->sql_fetchrow($result);
    }
    if ($cookie[2] == $pass && $pass != "") { return $cookie; }
    unset($user);
    unset($cookie);
}

function get_theme() {
    global $user, $cookie, $Default_Theme;
    static $ThemeSelSave;
    if (isset($ThemeSelSave)) return ($ThemeSelSave);
    if(is_user($user)) {
        $user2 = base64_decode($user);
        $t_cookie = explode(":", $user2);
        if($t_cookie[9]=="") $t_cookie[9]=$Default_Theme;
        if(isset($theme)) $t_cookie[9]=$theme;
        if(!$tfile=@opendir("themes/$t_cookie[9]")) {
            $ThemeSel = $Default_Theme;
        } else {
            $ThemeSel = $t_cookie[9];
        }
    } else {
        $ThemeSel = $Default_Theme;
    }
    $ThemeSelSave = $ThemeSel;
    return($ThemeSel);
}

function is_admin($admin) {
    global $prefix, $db;
    static $adminSave;
    if (isset($adminSave)) return ($adminSave); //steve
    if(!is_array($admin)) {
        $admin = base64_decode($admin);
        $admin = explode(":", $admin);
    }
    $aid = $admin[0];
    $pwd = $admin[1];
    if ($aid != "" AND $pwd != "") {
        $aid = trim($aid);
        $sql = "SELECT pwd FROM ".$prefix."_authors WHERE aid='$aid'";
        $result = $db->sql_query($sql);
        $row = $db->sql_fetchrow($result);
        $pass = $row['pwd'];
        if ($pass == $pwd && $pass != "") {
            return $adminSave = 1;
        }
    }
    return $adminSave = 0;
}

function is_user($user) {
    global $db, $user_prefix;
    static $userSave;
    if (isset($userSave)) return ($userSave);
    if (!is_array($user)) {
        $user = base64_decode($user);
        $user = explode(":", $user);
    }
    $uid = $user[0];
    $pwd = $user[2];
    $uid = intval($uid);
    if ($uid != "" AND $pwd != "") {
        $sql = "SELECT user_password FROM ".$user_prefix."_users WHERE user_id='$uid'";
        $result = $db->sql_query($sql);
        $row = $db->sql_fetchrow($result);
        $pass = $row['user_password'];
        if ($pass == $pwd && $pass != "") {
            return $userSave = 1;
        }
    }
    return $userSave = 0;
}

function formatAidHeader($aid) {
    echo get_author($aid);
}

function get_author($aid) {
    global $prefix, $db;
    static $users;
    if (is_array($users[$aid])) {
        $row = $users[$aid];
    } else {
        $sql = "SELECT url, email FROM ".$prefix."_authors WHERE aid='$aid'";
        $result = $db->sql_query($sql);
        $row = $db->sql_fetchrow($result);
        $users[$aid] = $row;
    }
    if (isset($row['url'])) {
        $aid = "<a href=\"$row[url]\">$aid</a>";
    } elseif (isset($row['email'])) {
        $aid = "<a href=\"mailto:$row[email]\">$aid</a>";
    } else {
        $aid = $aid;
    }
    return $aid;
}