Have a PHP site with MySQL backend. I have full access to CPANEL and FTP site.
The link below takes you to a page with our pup's. When you click on the link it brings up some pictures - 1 large and typically 3 smaller pictures. You used to be able to click on the smaller pictures and they replaced the bigger one.
I would like something like you click on the small pix and it replaces the big one or maybe it allows a pop up with bigger picture or some other ideas.