Here are some that were referenced in the thread. None of them use your chip though, so some modifications would need to be made, or changes to a new chip.

A 12F683 design (would require a fair amount of changes to work on your chip)
http://www.picbasic.co.uk/forum/show...4998#post84998

This one could not be modified for your chip, and would require a 18F2431, or 4431.
http://www.picbasic.co.uk/forum/show...1961#post91961 (cleaner code than above)

And the one rmteo pointed out, which would require an 18 series chip: http://www.picbasic.co.uk/forum/cont...e-Servo-Driver (Darrels, so you can't really go wrong)

Once you decide which way you would like to go, I am sure we can help you get it going.