. The link you want is the one that says "IMG Thumb" or "IMG clickable thumbnails for message boards".
Thank you immensely B.J., it appears that should solve my
problem. If there are similar features for other image-sharing sites it would be a good idea to cobble together a list of examples for newbies. The other boards I've posted images on essentially generate their own resized thumbnails for oversized images, so I'm not used to this problem.
There's an important point in the first link you sent "[FONT=Arial][SIZE=3]The Thumb code may only display if you move your mouse over the media or if you chose to display thumbs in your Link options. [/SIZE][/FONT]
" I'm not even sure if was showing it on mouse-over. Why that's disabled by default in the options is beyond me.
Remember, teach a man to fish...