[Mailman-Users] How do I link into the archive page to control access

[precision at comcast.net]

I have a site with multiple email lists (all private).  It's easy to keep 
unwanted persons from posting to the lists, but I would like to tie into/replace 
the main archive page for each list with a php script tied into the site which 
uses the user information/privileges that are already built into the web site to 
control access to the list.  The web site uses the users email as their account 
and it is password protected.  I have a privilege mechanism set up on the site 
to grant users access to various functionality.  I'd like to use that same 
mechanism to grant privilege to viewing the lists.  Is there a way that I can 
replace the "default" archive page with a php version which I could tie the 
existing privilege/security mechanism that already exists on the web site and 
control access to viewing the list through it?
Thanks