Insert more frames

Hi there,
I have an animation which starts off with a particle system emitting particles for 120 frames, then I’ve set up several other animations to take place after this.
Is there a way I can have the particle system last longer (say 500 frames) and sort of push the other animations so that they happen after this?
In flash it would simply be pushing F5 a couple of times but I can’t see a way to do this in blender without manually moving every key frame.
Thanks

You can move all your keyframes at once in the dopesheet window. Select them all (B for boxe select) then move along the x-axis (G). Press the Summary button for easier moving all keyframes.

Ahh thank you, so much easier