settings.php

<div class="wrap">
    <h2>OpenTools Advanced ordernumbers</h2>
    <form method="post" action="options.php"> 
        <?php @settings_fields('create_ordernumber-group'); ?>
        <?php @do_settings_fields('create_ordernumber-group'); ?>

        <table class="form-table">  
            <tr valign="top">
                <th scope="row"><label for="customize_ordernumber">Customize Order Numbers</label></th>
                <td><input type="text" name="customize_ordernumber" id="customize_ordernumber" value="<?php echo get_option('customize_ordernumber'); ?>" /></td>
            </tr>
            <tr valign="top">
                <th scope="row"><label for="ordernumber_format">Order Number Format</label></th>
                <td><input type="text" name="ordernumber_format" id="ordernumber_format" value="<?php echo get_option('ordernumber_format'); ?>" /></td>
            </tr>
            <tr valign="top">
                <th scope="row"><label for="ordernumber_counter_scope">Scope of the Counter</label></th>
                <td><input type="text" name="ordernumber_counter_scope" id="ordernumber_counter_scope" value="<?php echo get_option('ordernumber_counter_scope'); ?>" /></td>
            </tr>
        </table>

        <?php @submit_button(); ?>
    </form>
</div>