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how to replace a 2 way double switch ?

i am replacing a 2 way double switch and thought I had noted all wires and terminals from old switch but when connected its not working correctly. there are 2 switches and 2 lights one at bottom of starirs and one at the top / both lights were ok before i tried to repace the top one/ excluding earth wires (3) ist cable yellow red & blue (both red/blue test live ) 2nd cable same colours but none live( could this be a ring loop ? 3rd cable black & red (red tests live) i didnt do the original wiring so am not sure what all the cable are / can any body help
peter, December 2008
Nice clear drawings here...

http://www.diynot.com/wiki/electrics:lighting:two_way_lighting

And a simple click changes the colurs from new to old!

If in doubt summon up a sparky...

Peccavi, December 2008