Yeah, basically you want an input selector and a cable splitter. You can get the splitter at any Radio Shack, just make sure to get one that's more than 1GHz.

I've got a pretty good input selector, but it's only RCA and S-Video. It's an RCA VH920.

On one hand, I would recommend it because it will respond to the button of the remote for the device you're using.

On the other hand, the remote sensor (on mine, at least) bites hard. I think I might have gotten it to recognize the IR code one time.

Anyway, I don't use this device as my main selector. It's actually what I use to switch between video game systems. I would suggest, at this point, that you get a full-on receiver and a nice set of speakers. Receivers aren't as expensive these days. Heck, you can get a decent Sony for under $150.

But yeah, an input selector is the easy way to go.