It looks like skin1/customer/main/navigation_seo.tpl is the guy that writes the navigation links. Not sure what I need to do to add the existing POST data to that in the .tpl
Here:
Code:
{if $navigation_page lt $total_super_pages*$config.Appearance.max_nav_pages}
<TD valign="middle"> <A href="{$cdseo_cat}/{$current_category.cdseo_url}/index{math equation="page+1" page=$navigation_page}.html"><IMG src="{$ImagesDir}/rarrow.gif" width="9" height="9" border="0" alt="{$lng.lbl_next_page}"></A></TD>
{/if}