You can use something like ImageMagick to convert them to .gif images then
use something like gifmerge to make them into a .gif anim.  When you open
the .gif in Gimp each frame should be a layer.

I don't know anything about the .pbm format.  Is it indexed?  If not then
the above method would result in a loss of image quality.  

Hope this helps.

Jon Winters

   "Everybody loves the GIMP!"

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