As far as I know most laptops have combined the S/PDIF out into the 3.5mm analog out port.
If already has a toslink to toslink cable then he needs one of these and it's called optical plug to mini jack (~2$)
Otherwise look for one of these called optical to mini cable (price depend on length, but 6ft ~3-5$)
But make sure your laptop actually HAS the optical out!
The 3.5mm analog out port will look like this (read: the led inside the port) if it indeed has an optical out.
Edited by lagittaja - 10/20/12 at 2:37pm