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dimmer switch?

i want to replace a light switch with a dimmer switch but the wiring is not usual.In the switch there are three red wires two black wires and an unconnected earth wire. also the switch i am replacing is metal unlike the current one which is plastic.
margaret anderson, August 2008
call an electrician. the metal switch must be connected to earth. Is it a 2 way switch?

anon, August 2008