[ILUG] Iptables to redirect outgoing http to another proxy ?

[Declan Grady]

Hi,
Im running squid as a proxy server for my lan,
I have a digiweb satellite connection, which has a specific IP address & 
port number which seems to be alot faster for browsing than doing a 
direct onward connect on port 80 from squid.

How can I use iptables to redirect my http traffic so that it uses this 
IP address and port number, like a another proxy server ?

I am using some iptables redirecting on incoming mail to a different 
machine on my lan, so I assume it shoudl be quite easy to redirect 
outpound port 80 stuff to a different IP & port ?

Thanks,
Declan