Thanks for that link! I'm not techie enough to be able to follow most of the instructions on that page, and I have a Mac whereas those instructions seem to be for a PC, but I simply connected the old Linksys router to the new Airport Express router, and my old laptop picked up the signal and is able to connect to the Web again. Nothing else seems to have been disrupted in the process, though I didn't change IP addresses or anything else. Not sure what other effects (security, etc.) it may have, but at least all of my computers are now on the internet! I appreciate the advice.