I have the Altec Lansing Inmotion 3. The thing has a Input jack in the back which is meant for other music players or laptops. So obviously it should work with my powerbook as my main speakers.. but i need a long cord that goes into the input of the altec lansing speaker system and plugs into my powerbook headphone jack... what would i search for? What type of cord is this? thanks.. EDIT: Here is the cord i need. The Headphone to headphone Cord, but a much longer cord than the one pictures.