from:
=====

auto eth1
iface eth1 inet static
       address 192.168.200.1
       netmask 255.255.255.0
       gateway 192.168.200.1


auto eth0
allow-hotplug eth0
iface eth0 inet dhcp
        hostname jim
        wireless-mode managed
        wireless-essid wireless
        wireless-key1 xxxxxxxxxx

To:
===
auto eth0
allow-hotplug eth0
iface br0 inet dhcp
        hostname jim
        wireless-mode managed
        wireless-essid wireless
        wireless-key1 xxxxxxxxxx
bridge_ports eth0 eth1