Problem with computer headset.

I bought a usb headset for games only. Its got one mic connected to an ear speaker like this:

http://www.clarityunltd.com/images/headset.gif

The problem is that right now this headset is acting like my computer speakers and I dont want that. I only want the voices from teamspeak or BF2's VOIP to come out of it. Thats why I bought it. I already have speakers and I hate those stupid desktop mics, so how do I get this to work the way I want?

I don't know I have the same set , I bought it for my son for CCS . I don't think you can have two speaker options like you want with out a amp or another sound card .