The first thing I should mention is that, If you ever need need to do a standalone restore, (less often need with 2003 but still, sometimes, necessary), I don't you can do this if your images are on an NTFS partition. Admittedly I have only just moved up to 2003 but this used to be the case and I have not seen anything that indicates a difference - only less reliance on SA restores. Ideally you should have a FAT32 partition for these images.
Now to your spanned files. If I am right in my assumption you will find that your 2 image files are exactly 2Gb and the spanned files will have similar names to the initial image files. This is because Ghost can only create a file of 2Gb in size so it links on to a second file for the remainder if the backup is to big.
You need to treat both of these files as 1 backup.