Connect a cell phone headset/mic to sound card jacks?

[john doe]

Hey

I am looking for an easy way to connect a cell phone headset/microphone
to a sound card's speaker output and microphone input jacks. I know
there are different types of cell phone headset/microphone plugs. I
suppose best would be the 2.5mm (4 connector?) plug to two 1/8" mini
plugs. Anybody know what those adapters might be called or where to buy
them?

http://sanyob.wslogic.com/wireless/images/Final%20Fly-out%20Graphics/ELM04A2_INFO.jpg

Alternatively, anybody know where to find the pin out of a typical
mobile phone headset/microphone plug?

Thanks very much in advance.