Area specific second level nav/page list

Hi,

Currently work on http://www.neilhair.com/new/

The main level navigation is across the top. Getting that with the following code…

<?php wp_list_pages(‘depth=1&title_li=’ ); ?>

Those main levels have sub pages. Only want the sub pages to show up for a specific section when I click into that section from the top nav. Example: right side sub-page list only shows up when I click into “Research” from the top. After clicking research right side shows all the sub-pages for the research area. On the home page the right side page list would not appear.

Hope that was clear. Any help you could provide would be greatly appreciated.