I have a custom header and I want to link to EZ-Pages I have created.

Code:
 <a href="<?php echo zen_href_link(FILENAME_XM_SUB, '', 'NONSSL'); ?>" class="menu_top"><?php echo HEADER_TITLE_XM_SUB; ?></a>
The URL to the EZPage is
http://www.purexm.com/index.php?main_page=page&id=2

How do I link from the tpl_header.php to the EZPage?