Animated pencil-please look!

lo all. i asked about this other day but no luck :frowning: i guess i was a bit vague!
im tryin to animate a pencil/paintbrush to draw/paint the intro for a site.

http://www.kaoss.org.uk/drawn/

if youve got 5 mins take a look at the link. thats what i got so far, im usin shape tweens and such. the problem is the frames/layers are buildin up and im strugglin to keep the pencil/lines in sync.
anybody got any tips/hints/links for a source on how to do this in a more efficient/simple way, i feel like im goin the wrong way about it and wastin precious time!

ne help much appreciated…

kev.