[CentOS] Addressing outgoing connections to a specific interface

On a CentOS 5.5 laptop (Dell Inspiron, dual boot with a Debian-based distro) I have a cable plugged into eth0 which is on a LAN with no internet connection. Additionally, I connect wirelessly on wlan0 to the internet. Both connections have router on the 192.168.0.1 address.

Although I need to stay connected to the wireless router, can I still access the address 192.168.0.1 on the wired interface? Some googling led me to the keyword "loopback" but I am at a loss as how to configure it, or if this is even the right idea. If there is a specific page that I should be reading in the fine manual then please do RTFM me, as I myself failed to find the proper page.

Thanks in advance.