algol is correct.. All you need to do is have the multiple connections on the same subnet, disable DHCP on the routers and assign static IP and DNS to each computer, pointing each relevant PC's gateway to the router you want to use for your outbound connection. I have used this method for A gaming suite in a hotel room where we had 12 PC's and 3x 8mb ADSL connections. Having different gateways is only an issue if you are trying to talk to machines on different subnets (as they will all be on the same network range this works really well for programs like ocotopus/keyclone.HKN).
I have attached a quick diagram to show what i mean. DHCP is enabled on router 1 to allow for other machines to connect to the network and still access the internet (ie laptops)
any probs give me a shout

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