My many thanks to Vin of tipsforbloggers.blogspot.com for giving the answer to my problem. I had tried just about everything to get my slideshow to work and it wasn't until I spotted a reply he gave to someone anonymous that I got success. Yippee a slideshow that is working. I can now add more photos whenever I want and they stay sitting exactly where I want them to be - at the top of the page.
More on other matters later.