After loosing my time with automator,
I post a proposal of 50€ for the scripter that would make me this simple script,
(I'm not use to script, I use visual programing and don't have time to learn now):
The script start it-self when computer start-up.
1/ move all files from "folderA" to "folderC"
2/ move all files from "folderB" to "folderC"
3/ delete in "folderC" all files that are more then 30 days old
4/ delete in "folderC" all files that are less then 20Mb
5/ delete all files that are not video (.mov)
5/ empty trash
6/ wait 30 seconds
7/ move files from "folderC" to "folderA"
this script should work on Mac os X10.5 (apple script 2.0.1) and 10.6
all the best,
Thomas Israel