it is written: wheel - (boolean: defaults to false) True if you want the ability to move the knob by mousewheeling.
but the function moves element
so it has to be:
wheel - (boolean: defaults to false) True if you want the ability to
move the element by mousewheeling.
to move the knob you have to add:
knob.setStyle('top', step) onTick:
http://mootools.net/docs/more/Drag/Slider#Slider
