Orders Exporter Module

[gjh42]

I have the order comments output rebuilt and working correctly on my test site, and the readme brought fully up to date. I want to test it on my live site before submitting to Plugins just to make sure. There is one nagging item, which does not cause any problems I can see, but ought not to be happening. When selecting an export range, two odd elements are added to the URL in the address bar. They vary seemingly at random in the numbers, but always look like ...&x=23&y=9.
For example:

http://localhost/zc151/my_admin/orders_export.php?from_oid=1&to_oid=99&x=38&y=6

I don't know what in the form submission would insert that, and would like to eliminate it.

    <div class="oidSetting"> <!-- Order ID setting inputs -->
      <h2><?php echo ORDERSEXPORT_PAGE_HEADING_OID; ?></h2>
      <?php echo zen_draw_form('oid_range', FILENAME_ORDERSEXPORT, '', 'get');
      echo '<div class="oidInput">' . OEX_FROM_OID_PRE . zen_draw_input_field('from_oid', $limits['orders_id'][0], 'size="10"') . '</div>';
      echo '<div class="oidInput">' . OEX_TO_OID_PRE . zen_draw_input_field('to_oid', $limits['orders_id'][1], 'size="10"') . '</div>';
      echo '<div class="oidSubmit">' . zen_image_submit('button_save.gif', IMAGE_SAVE) . '</div>';//form submit
      echo '</form>';?>
    </div>