Hey everyone,
I created this file several months ago for a tutorial that is still being worked on, so I figured I’ll go ahead and upload the source file in case it is of use to somebody. You may want to make the yellow circles invisible if using it for non-test purposes 
Tutorial with in-depth explanation can be found here: http://www.kirupa.com/developer/actionscript/predicting_collisions.htm
[size=1]EDIT: I am not sure which format I saved the FLA in, but if it isn’t working, just tell me and I’ll upload for an earlier version of Flash.[/size]
Cheers!
Kirupa :sailor: