I have had at least a dozen people give me codes for putting thumbnails on a page that enlarge when clicked. The best result I have had is a Red X
Do we have a genius who can solve the problem?

Absolutely. Probably even a few fairly dumb guys who can solve it. But we need for you to tell us exactly where this "best result" is, so we can see what the mistake was.

I hadn't closed that window, so after leaving the board I clicked another couple of pages. Found a red X in the 1950s somewhere. The image was supposed to be somewhere else, no on your site. That is usually a mistake.