Flash Frame-By-Frame Animation: Detailed Animation Part II
From Adrien-Luc Sanders, former About.com Guide
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Detailed In-Betweens IV
If, like I have, you've drawn down to the lowest level of detail possible, you should fill in all of the in-between frames (on mine, there's only one left) between the first frame and your midpoint to complete the first half of the sketched animation.
Flash Animation Tutorials: Step-by-Step Lessons