hi, i want to replace a light switch in my living room, at the moment its a standard switch with 2 switches on it, basically it controls a chandalere type light with 5 bulbs and at the moment 1 switch controls 2 bulbs and the other contorls the other 3. i want to replace the switch with a single dimmer in order to control all 5 bulbs simultaneously. the wiring at the moment consits of red, blue, yellow and an earth. Can any one help.