Connect to WiFi befour loging on

Hi what i am pretty much trying to do is make the wifi connect befour it logs
me on as i have a Active directory server home holders and scrits don't run
corctly and users that have not loged on befour via cable get an error saying
the domain cannot be found

is there a way of doing this or is there something i need to buy i can do it
wiha dell just not a Presario M2000 Series Laptop my dell asks if i want to
auth prier to login but i cant find on this laptop both XP Pro SP2

any help would be helpfl thanks


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Aaron