Mac keeps logging onto neighbour's network!

I have an Airport system connected to my hi-fi, which correctly appears as a network option. However, a rogue network has also appeared (I assume a neighbour).
I am a bit concerned about security and the like, so I'd like to set my Mac to not ever log onto the neighbour's network, and to only search for my own one.
I have tried SYSTEM PREFERENCES - NETWORK, but oddly the network names don't appear in the PREFERRED NETWORKS box. However, they do appear in the Finder's top taskbar.
How can I tell the Mac to only log into my hi-fi network (or - more importantly - ignore the rogue one).
Thanks!

Very amusing. My daughter has an iBook with Airport. I'm not wireless, or wasn't over summer when she kept conveniently accessing the internet. Never the tekkie, I assumed it was by some invisible force ("magic"), courtesy of the amazing apple. Turns out she was innocently airporting off of several neighbors (pick anyone at any time); only one of them had put in a password, but sometimes she was limited if the non-password folks had their computer off. We didn't figure out what was going on for several months, when a tekkie's visit discovered it. She never did any mischief, but I agree with those concerned about security. Appreciate the info in those replies; we'll do that when I get upgraded.
I have Airport Extreme base station now, so neighbors are not necessary, LOL.
G3 converted to G4   Mac OS 9.2.x   non-wireless but have Airport Extreme for wireless laptops in household

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