Thank you, Dan, DarkroomExperimente, Jim, and Lol for your nice comments. I'll take a look at those counters - my hosting service has one built in, but I haven't tried to interpret its output yet.
I've taken a shot at providing larger versions of the photographs. Now, once you have clicked on one of the thumbnails to take you to the medium-sized version which was there before, you have the option of clicking on that medium-sized image or on the "larger" link in the navigation panel to take you to one which is 50% larger. Then you can navigate through the larger versions with the "next" and "previous" buttons, or go back to the smaller ones. If you get a chance, let me know if I've now made the navigation confusing or any other problems.
I have to get back to doing some actual photography - this web design stuff can eat up all your time. Oh, well, I guess anything worth doing is worth doing to excess.
Thanks,
Mark