Hint: my screen is just not big enough to see the image, as a whole!
Tim, open the pic in a new browser tab by ctrl + left mouse button, or clicking the scroll wheel button on the thumbnail, BEFORE YOU LEFT-MOUSE-BUTTON CLICK. Windows scales the picture to fit the screen in the new tab. Much more satisfying than scroll-barring the pic at full resolution in the thread window.
many thanks, for the tip.
I learnt something new today - much appreciated.
It works, for me, when I just open a new http://www.opera.com
It would be easier if it wasn't necessary but, there you go.
It's better to have contributions than not.