Setting up two ADSL lines for home/business use

Setting up two ADSL lines for home/business use

As a follow-up to this question which is still unresolved. I have two ADSL
routers with different providers connected to different phone lines to the
internet. As shown in the diagram. These routers have addresses
192.168.0.1 and 192.168.1.1 on my local network.

I want the computer on my home LAN with address 10.0.0.50 (and others) to
be routed through the 192.168.1.1 gateway, and the computer with address
10.0.0.60 (and others) to be routed through the 192.168.0.1 gateway. I
also want to let 10.0.0.50 to communicate with 10.0.0.60 (file sharing,
remote desktop, etc)
I am using shorewall to configure iptables and squid as a transparent
proxy. Is my configuration possible? How should I do it?