Originally Posted by
LesterOfPuppets
Expanding on what NathanL said...
If you have your right mouse button mapped as a browser back button it might work if you click on an area of the page that's not an image.
That must be pretty odd with it mapped like that. I use right click to open links in new tabs or windows so often I'd go crazy if I got on a computer where right click was the browser back button.
Do me a favor and right click somewhere in the blank space on this page. See the context menu that pops up? See how "Back" is on the menu? Many people navigate this way.