Routing table question.

I have a point to point T1 anchored at each end with a Cisco 1720
Router. I also have a T1 line that goes to the internet. The servers
at either end have 2 NIC's each.

Site #1 looks like this:

Internet NIC:

Point to Point NIC:
I didn't put a gateway here because I found it caused more problems
and didn't solve any.

Point to Point routers
Site 1: -> -> Site 2: ->

Site #2 is set up like this.

Internet NIC:

Point to Point NIC

I know I need to make an entry into the routing tables to make the
point to point traffic use only the 10...etc NIC, but I'm not sure
about the syntax. Any help would be appreciated.