Display menu external page

Hi all just wondering is it possible to display the main menu on an external html page as I am using wordpress and WHMCS which has all been installed in the same folder. Im using a html version of the wordpress theme for the WHMCS software. But i need to display the menu on this html page.

This is the code used in the wordpress theme

<?php printMenuItems(); ?>

but when i add it to my whmcs template it does noting.

Please can someone tell me where to start.

Thanks
Aiden