This is a noob question but what button do you press to talk in online in cod 4?

um.. the brain button? :p

Talk is always on when your mic is connected.

Great I was pressing every button then talking, I must look like an idiot now

Heh, not at all. It's different game to game, you just need to know what to look for. And that's the little speaker icon next to your name in the lobby. It should light up when you're talking. That's means you're transmitting. If the icon is not there at all, then your mic is not properly connected.

thanks man im off to play it

Now, if only Infinity Ward would make is possible to MUTE people.

I don't know how this function gets left out.