Sharp GP2D12 8bit

hi guys,
is anybody who realized a curve linearizing for this kind of sensor?(gp2d12)
i need an 8 bit reading. i already found the 10 one but it's not good to me
i tried to do it by lots of examples like
http://www.acroname.com/robotics/inf.../irlinear.html

as shown in the example reported in this site i need to calculate the M and B constant values, the ones i found aren't so good...

and others..
i'd like to thank everybody who can help me,
i already asked for information on an italian forum..but i haven't found the right instructions yet....