Authenticate to OpenLDAP using PAM

[ms419@freezone.co.uk]

I would like to authenticate to my OpenLDAP server in the same way I 
authenticate when I login (using PAM). After googling, I conclude most 
people are interested in the reverse: Using LDAP to authenticate when 
they login. I've also read 
"http://www.openldap.org/doc/admin22/security.html";, but it's not clear 
to what "user" and "password" correspond ...

Specifically, can the "user" and "password" supplied to the "simple" 
OpenLDAP authentication method be checked using PAM?

More generally, how can I authenticate to OpenLDAP using PAM?

Thanks!

Jack