Hi Roger,
Here is a free and mostly painless way using VirtualDub.
1. Convert all your images to bmp, tif, jpg (bit not FITS!)
2. Name them all in sequence as follows something.001.bmp, spmething.002.bmp etc
3. In VDub, select open video file and change the files of type to image sequence
4. Select the first of the sequence, ensuring that the 'automatically load linked segments' is checked - this will load all your images in to vdub in order.
5. Select Save as AVI
6. Run it through LiMovie
