Yes I do thanks - will look at them and hope I can find the books still there!! It will be a nightmare to reconstruct them!!!
If you updated iPhoto since you created the books, the themes may have changed. Then try to restore the old iPhoto version as well, if it can run on your current system.
If you have to open the library with the book in a newer version of iPhoto duplicate the book project before you open it again for browsing.
This way you can experiment, which of the current themes will be closest to the ones you used.