To have 3 switches control one circuit of lamp(s), it's easy to do
with a 24 V (or other) coil bi-stable latching (or toggle) relay. The 3
switches are just pushbuttons. Momentarily pressing of a button will
put the relay in the opposite state that it is in currently. In other
words, If the light is on, press a button and the light will turn off.
If the light is off, press a button and the light will turn on.

If you use the low voltage control circuit, you won't need 14 gauge
wire. And with a relay, you can have as many buttons as you want -
not just 3.

I paid $32 for that kind of relay about a year ago from
http://eskc.com/default.asp . A quick web search didn't turn up
anything that cheap currently, but you would look harder (use the phone
too), or maybe pay more.

You could use some electronics to do the job too:
http://ourworld.compuserve.com/homep...page9.htm#4013

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