two interfaces routing issue

[John D.]

Hi,

My server has two interfaces, it has two public IPs bound.
For example, eth0 has the IP:

216.239.32.xx
the gw for this network is 216.239.32.1

eth1 has the IP:
  208.84.0.xx

the gw for this network is  208.84.0.1

Since the system has only one default gw 216.239.32.1, my question is, 
how to make the incoming packages to eth1 return back via the second gw 
208.84.0.1? thanks.

John.