You can check out what I did with my compaq here
I had the same problem. I wanted to use a free laptop for my carpc, but being that it was a laptop I didn't want to destroy it in order to use it in my car. I wanted to be able to bring it inside easily. So, I constructed using wire from a ethernet cable, a stero audio jack and about an hour free time a remote switch.
I think you can pull it off. Check for continunity between the pins when the swtich is both closed and open. That way you know which pins to solder the wires to.
You need to tin the wires first. (Coat them in solder) Then snip them real close so you don't have any more than necessary...Preheat the wires and then touch them to the switch applying a little heat from the iron. If you want higher res pics PM me with you email address and I'll send them to you.