I have set up a proxy on a mandrake machine it works gr8

Now i need to allow certen users to go out the internet via the proxy
how can i configure my squid to ask username/password from the client machine
and authenticate it with the Active Directory/PDC or a local db on the linux

i have allready checked the basic authentication option it working gr8
but it asks for authenticate each time the user open a session and it is
kinda buggy ,

Seeking for your answers

Juda Barnes
Ness Tech