I want to allow my customers to use my wireless connection without any possibility of accessing my internal network.

For example, having one wireless router #A connected to my cable modem broadcasting it's own SSID on channel 1. Then a second wireless router #B connected to #A via wire, connected to my employees network - secured and and not broadcasting SSID, using channel 11. Would that work? Obviously would have assign a unique IP addr for each router

I've also heard that there are routers that allow a dual-connections like this, but I haven't been able to find any.

Andy