Two GW and virtual IP

[cyberbot]

Dear all,

Our box has two NIC connected,
our ISP provided us with two IP blok.
each 6 IP has it own GW.
we managed to connect two NICS LAN/WAN and using Virtual WAN IP.
but the second IP blok cannot get them routed because there is no GW defined as we are out of NICS.

is it possible to have the GW add as virtual GW as well?
Do we really needs a physical cable connect in order to have the second GW up and running ?