Hi Steve,
Thanks for the great thumbnail suggestion. I have worked out how to use thumbnail hyperlinks to the large version of the image.
I created a web version of the high res image (about 100k max) and a thumbnail version (150x100 pixels at 72pixels/inch) and uploaded them to a folder on my web site.
On the Message Board post, just include the reference to both images (tn=thumbnail) as below, and it is all done. I had to add "ref" after the [codes] to stop them from operating here.
[URLref=http://www.////image.jpg][IMGref]http://www.///image_tn.jpg[/IMGref][/URLref]
Have a look at
http://yssyforum.net/board/showthread.php?p=255#post255
Unfortunately the new 10 image limit still applies to the post.