<?php
        if(isset($_GET['sidedybde']))
        {
?>
        <input type="checkbox" name="underside" value="Yes" /> Siden har undersider i menyen.<br />
        <br>
            </div><div style="font-size: 15pt;">
            <input type="submit" value="Lagre" /></div>
            </form>
        </div>
<?php
        }
?>