action before the authentification

Hello,

I use a squid proxy 2.2.stable4 on linux 2.2.13. Each users must be authentified
to browse a web site throw the proxy. The authentification is made using ldap
(with a Netscape Directory Server).
Before doing the authentification, I want that all users accept an agreement
form by clicking on a yes button on a html page. Do you know how can I do that ?
 
Regards,

Oliver somewhere in The Hague

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