wrote:

We have two switches (on top of stairs, one bottom) for a light.
(It was set up in 1965, so I don't think there's fancy chipwork.) How
was this set up? I'm thinking of replacing one switch with an infrared
motion detector switch, but I have had some problems with these IR
detectors if the lightwork is too fancy (eg, one LED bulb would never
switch off in IR mode, but would manually switch on/off).

- = -
Vasos-Peter John Panagiotopoulos II, Columbia'81+, Bio$trategist
BachMozart ReaganQuayle EvrytanoKastorian
http://ourworld.compuserve.com/homepages/vjp2/vasos.htm
---{Nothing herein constitutes advice. Everything fully disclaimed.}---
[Homeland Security means private firearms not lazy obstructive guards]
[Fooey on GIU,{MS,X}Windows 4 Bimbos] [Cigar smoke belongs in veg food group]

"Three-way" switches can be wired in several ways, depending on
physical layout. see
http://www.the-home-improvement-web....way-switch.htm

Are you using a *3-way* motion sensor switch like this one:
http://www.acehardware.com/product/i...ductId=1294389

--reed