Yep, just tried that out. I wrote a program to split the image into frames:
input "path ->",path$
load image path$,1
paste image 1,10,20
set cursor 10,600
input "across ->",tempa$
input "down ->",tempb$
across=val(tempa$)
down=val(tempb$)
width=image width(1)/across
height=image height(1)/down
tempx=0
tempy=1
temp=2
cls
paste image 1,0,0
for c=1 to across*down
inc tempx
inc temp
if tempx>across
tempx=1
inc tempy
if tempy>height then exit
endif
get image temp,(tempx-1)*width,(tempy-1)*height,tempx*width,tempy*height,1
save image "TempImages/"+str$(temp)+".bmp",temp
next c
Then opened all the frames in Photoshop. A Google search told me that if you paste them all into one file as layers (with the first frame on the bottom), you can go to "File/Save for Web", check "Animation", and save. Not sure exactly what you press in Gimp.
Cool, I learned something today
.