[SQU] two ISP on two ethernet adapters

For my company I need two solve the following problem:
We do have two ISP on two ethernet adapters. How can I set up Squid (2.3Stable2) in that way that it chooses the ISP (and therefore ethernet adapter) depending on the port the request came from?

Network overview:

    Intranet: <-- eth0
                       eth1 --> ISP 1
                       eth2 --> ISP 2

All devices to belong to the same subnet.

If you do have any idea how to do this (or where to look), please answer.

Thanks in advance,
        
        Jens Potthast

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