Replacing TV

Finally getting around to upgrading the main television from the heavy anchor dinosaur tv that is in the unit to a flat screen. However, I notice that the plug for the house speakers is a typical phono plug, like headphones, where my only sound output is the more up to date component outputs on the flat screen. Can anyone point me to a good adapter that will be sure to work with a female phono plug to the 2 coloured audio male plugs to plug into the back of the new one? Nothing bothers more than trying 2 or 3 different types before finding one that works.

Thanks