Math Help/Camera moves

Hi,

Need some quick math help. I'm attempting to use sio2Orbit to give my camera a "sway" behind my FPScharacter head.

I'd like to acheive a floating camera that follows the small path of a figure 8 (or infinite loop) behind the head object, however the trig functions for the continuous (sinuous) movement are eluding me...

Any suggestions would be greatly appreciated, thx in advance