Laptop and subnet question

[David Lewis]

I've got a user who plugs his laptop into our
network on either the 10.0.1 subnet or the
10.0.2 subnet.  His TCP/IP is set statically
which means he has to change his address each
time and reboot.

The DHCP machine is on the 10.0.1 subnet, 10.0.2
is connected across a couple of Cisco routers on
a 56k frame.

Is there a way I can have DHCP determine which
subnet he's on and assign him an address
appropriately?

If not, any suggestions to make it easier for
this guy?