Headphone splitters?

I am looking for some thing that can split the 1 input I have in my computer speakers into 2 inputs and I came to the theory that a headphone splitter (made to create 2 outputs) could do this. Can they? If not, is there anything that can allow me to share the audio input from an Xbox 360 and a PC without switching?... show more I am looking for some thing that can split the 1 input I have in my computer speakers into 2 inputs and I came to the theory that a headphone splitter (made to create 2 outputs) could do this. Can they? If not, is there anything that can allow me to share the audio input from an Xbox 360 and a PC without switching? Also, I tried plugging the Xbox into a microphone jack, Vista detects the sound but doesn't play it.
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