Logitech z5500 on a macbook

Hi all,

I purchased the logitech z5500 5.1 system and i'd like to hook it up
to my macbook. i suppose with a dvd player or ps2, it's just a matter
of getting an optical cable and plugging it in.. but i'm not sure how
to go about doing it on a computer with only a headphone jack... do i
just need the optical cable (called toslink?) and then get a toslink
mini adapter and i'm all set? will this mini adapter work in the
headphone jack?

Thanks a lot!!!!!!