Yes, you should to install a little software called routed (I'm not sure that is this name), this software you should install in the pc with FC5.
later, you should configure this daemon and... FINISH!!!.
but if you want surfing the net with the laptop, the pc with FC5 should be connected and online.
the second solution is:
buy a switch/router and conect each pc to a diferent switch port
.
good luck