<form method="post"
      action="<?php echo ap_url_to("login"); ?>"
      id="login">
    <input type="hidden"
           name="ap_chal"
           id="ap_chal"
           value="<?php echo ap_get_tmpl_var("login_challenge"); ?>" />
    <input type="hidden"
           name="ap_resp"
           id="ap_resp"
           value="" />
    <label for="ap_user">Username: </label><br />
    <input type="text"
           id="ap_user"
           name="ap_user"
           value="<?php echo $_POST["ap_user"]; ?>" /><br />
    <label for="ap_pass">Password: </label><br />
    <input type="password"
           id="ap_pass"
           name="ap_pass"
           value="" /><br />
    <input type="submit"
           id="login"
           value="Log in"
           onclick="return sendForm();" />
</form>