to help u make ur animation not jumpy 
 ur placement must be perfect
  
 have u ever used the toggle in AS ? have u ever heard of it?
  
 it is named the ONIONSKIN TOGGLE
  
 Here i just made u this pic
  
   
 it's an awesome aid in lining up framed pics
 and along with zoom out by 10, it makes it possible to line up those frames that are out of sync
  
 belladama