Moving keyframes for several objects at the same time

Hey everyone!

Okay ive been trying for about three hours now.
Two of them spent on the internet to try to find a way to do this simple task but it seems impossible.

Here it is:
I want to select several objects and move their keyframes at the same time.
I tried doing it with the ipo editor and the nla editor.
In the ipo I cant select more than one object and in the NLA window I cant get any actions trips with connected keyframes since I dont have any actions.