I've changed the site so that you can now hover over the thumbnail photos to change the main photo. This also works in the log book but not when using zoom.
If you are adding a photo to the log book you can either click the thumbnail photo as before or click on the text entry box and enter the details, hover over the photo you want, and then press the return/enter key to add to the log book.
Please let me know if you spot any problems.
Thanks