Networking help

I have a little issue trying to access a wireless access point (Linksys WAP54G) web browser set up page. I thought the address was 192.168.1.1. When I try that it does not work. How do I check what the IP address is of that access point so I can access the web based browser set up page? It is connected to an Apple Airport Extreme (wired) as the main router.

Once I get the IP I take it I type that number into the browser and log in using the user name and password?