<form action="./index.cgi" method="post">
    <input type="hidden" name="page" value="200">
    <table>
        <tr><td><input type="text" name="username" value=""></td></tr>
        <tr><td><input type="password" name="password" value=""></td></tr>
        <tr><td><input type="submit" name="login" value=""></td></tr>
    </table>
</form>