yeah, pretty much what Toxic said.
you can open Gifs into Photoshop (CS2, 3, 4) and they will come in as seperate frames if you go to window>animation. that will bring up the gif animation control panel (which used to be adobe imageready before they incorporated into photoshop). You can then create a still sig and add in the frames to create your .gif animation.
I'm gonna go have a go at this in a minute.
ok, i wasn't expecting that.
You literally cannot do it by doing what i just said. Upon further research into it, it appears that some Gifs dont save the layer information so when opened into PS they just come in as a single layer.
I'm busy installing Adobe CS and image ready to see if i can do it that way.
EDIT 2: BOOSH!
Ok so i opened the gif into imageready and it opened as all individual layers. Im gonna post up a step by step guide once i get it done
FYI the gif i'm using is the one you are using for your Avy Hit.