gtkHScale - scroll wheel behaviour

[Neil <damonkieman hotmail com>]

hi all, 

how
would i go about changing the behaviour of an hscale widget when the
mouse scroll wheel is used?  for example, swapping what happens when
you wheel up with when you wheel down?  would i have to code a new
class that inherits hscale?  i don't think the gtk_range_set_inverted method provides the behaviour that i am 
looking for because it not only changes the direction the slider moves, but it also moves the slider to the 
other end of the scale.

thanks,

neil