Speakers for laptop?

Right, maybe i am being dumb, but never the less. i am thinking of buying logitech x-230 speakers (http://www.amazon.co.uk/logitech-x-230-multimedia-speaker-system/dp/b00069zea6/ref=pd_bbs_4/202-5882675-1640659?ie=utf8&s=electronics&qid=1188302372&sr=8-4) to use with my laptop (gateway m series), because built in are a little rubbish. however the only ports i have are usb ports. can the speakers be connected through the usb port then? is this the case for all tese type of speakers? thanks.
Answer
Almost all laptops with sound have a headphone jack. this is the standard method to connect the external speakers. if memory serves me (i could be wrong)on the m series notebook the jack is under the mouse pad right in the front