That is not the way to do it
The easiest way is to create a motion tween from 20 blur to 0 blur. that way it automatically figures out how much to blur the object each frame + it is less tedious
Reviews for "Flash 8 Blur Tutorial"
serpents-tail responds:
Okay glad someone said this. first you would have to shape not motion and plus you can olny add filters to a button MC or text. None of those you can shape tween.
Seriously
Allow me to be the one to do the teaching. First frame is completely blurred. Do a motion tween. Last one is completely focused. Ta-da.