10 POINTS: AIM buddylist for mac?

I just bought a mac today. Before, I used to have pc and on pc, in the AIM buddy list, all of the offline people would be under offline. However in mac right now, everyones sn (including offline people) show up under each buddy list and the online people are in bold. How do i make it so that offline people are under one list and only the online people show?