Transparent proxy with FreeBSD 3.0

[Cache Administrator]

      Hi all, 

 I have a problem with transparent proxy.  I have a router machine and a 
cache machine. I need to redirect request on port 80 through the router to port 8080 
on different  machine ( my squid server ). 
I have tried transparent proxy by putting the squid on the router   machine, and it 
worked fine. 
But now I want to put the squid on different machine, and from router, 
redirect request on port 80 to that machine.  FYI, I used FreeBSD 3.0 
for my router to redirect request on port 80. 
Coud anyone help me with this problem? 

Thanks in advance. 

Alik Yuswanto