authenentication

["David theobald" <davidtheo@xxxxxxxxx>]

I am trying to do the following can anyone help

I want my wireless network to use the proxy on my sever proxy cashe in order 
to access http and ftp however I want them to use user-based 
authenentication on the proxy how do I do this I am using squid on the sever 
proxy Cashe firewall

I am trying to do this in IPTABLES can anyone please help

David