I want to include the css categories sidebox into my header - so that I can have a dropdown menu.

I know that it should go into this area:

<!--bof-optional categories tabs navigation display-->
<?php require($template->get_template_dir('tpl_modules_categories_tabs.php',DIR_WS_TEMPLATE, $current_page_base,'templates'). '/tpl_modules_categories_tabs.php'); ?>
<!--eof-optional categories tabs navigation display-->

the css sidebox is located at shop/templates/MYTEMPLATE/sideboxes/tpl_categories_css.php


I just am not sure how to put it into there... any help is appreciated.

--ad