I would imagine most programs have similar methods, so I'll tell you my suggestion based on Photoshop. I would open a new image the size you need for your final image. Then open the gif images and copy them (drag or select portion needed then edit-copy) to the new image, one by one. Photoshop will lock images so I can't move them, but on the layers palette I can deselect the locked tab. Now you should have a layer for each image displayed on the layer palette for the new image. Try this and see if it works for you. Again, since I don't know which program you're using I'm not sure if this helps!
Daisy