wireless interface timeout configuration

Hello,

I have a small desktop running RedHat 5. Depending where I'm at, it connects to the network by a wireless interface or a wired interface. If I'm in an are where there is no wireless network, the box hangs on boot up. It will not timeout and move on. It just hangs. Is there a timeout variable that I can set in the configuration file? BTW - I'm using this box as a server, so it's usually headless when I'm booting.

Thanks!