set dupli group active

hi
i’m making a fairly complicated scène where i animated a few hundred emptys( all emptys are differently animated). now i want to activated the dupligroup on those emptys (on all the emptys the samen group). is there a way to do this all at once? or do i really have to do this a hundred times.

please let there be an easyer way cause i have to use thise emptys in other scènes aswel.

thanks