5.1/2.1 speakers on an iMac?

[FortWorthMac]

Hello,

I have a set of Logitech 5.1 speakers that I used on my PC before I bought my Mac. Of course the set of speakers has all kinds of plugs. I doubt that I can plug that into the iMac in anyway but what a 2.1 speaker set?

Something like:

http://www.amazon.com/Logitech-Z-23...1?ie=UTF8&s=electronics&qid=1236927749&sr=8-1

Thanks