apt.conf problem

[Samuele Giovanni Tonon <tonon@students.cs.unibo.it>]

hi i'm trying to configure apt to use a proxy when it download 
packages.gz from the net.
i read configure-index.gz but i didn't understand too much what
to do ..
here's my apt.conf , could you tell me where i'm wrong ?

many thanks

DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt";};

ftp
  {
  Proxy "http://myproxy.mydomain.it:8080";;
  ftp::Proxy "http://myproxy.mydomain.it:8080";;

 ProxyLogin
    {
       "USER $(PROXY_USER)";
       "PASS $(PROXY_PASS)";
       "USER $(SITE_USER)@$(SITE):$(SITE_PORT)";
       "PASS $(SITE_PASS)";
    };



  Timeout "120";
  };

but it doesn't use the proxy .
where is the problem ? 

thanks 
samuele 

-- 

Samuele Tonon <tonon@students.cs.unibo.it>
Undergraduate Student  of  Computer Science at  University of Bologna, Italy    
Lynux System administrator at  Computer Science Research Labs of University 
of Bologna, Italy    

Founder & Member of A.A.H.T.