Constant +/- switches for cegs with operators

[Karl]

http://pastebin.ca/2039638

on subfire effect you see i am using several operators on gravity
yet i failed on it

does anyone know how i could make it a whirl like effect?
also that it switches between positive and negative gravity value
constantly

very much please? Because you can see a nice fire effect everytime you use the arsonist :)

[KDR_11k]

Be warned that the functions are only evaluated when the particles are spawned, the particles don't re-evaluate them.