[squid-users] squid with 2 gateways

[[EMAIL PROTECTED]]

I've a network like this:

NET1-            -ADSL1
       >SQUID<
NET2-            -ADSL2

I need that NET1 outgoing with ADSL1 and NET2 
outgoing with ADSL2.
I used ADV-routing-howto and all works without 
redirect traffic to squid, but when i use iptables to make transparent 
proxy, all traffic use only the default gateway (ADSL1)
I suppose that 
squid alter packet mark and not use the second routing table.
Anyone 
can tell me a solution?