Remap number range

# re-maps a number that is within one range, to be within another range
# example remap 0-255 to be 0-1: remap(23,0,255,0,1)
function remap(val,valmin,valmax,newmin,newmax)
	return ((val - valmin) / (valmax - valmin)) * (newmax - newmin) + newmin
end-function