PS3 Audio Hook Up

How do I hook up my PS3 to a surround sound system, and at the same time connect to my LG Plasma TV? Do I need some sort of special connection device?

did your speakers come with a little black square that has the red+white composite on one side and the black green and orange audio on the other? I use that to hook up my ps3 to the surround system and then use a hdmi cable for your tv