January 2015
SCRIPT - Floating Layer At Cursor Position
This post shows how to implement layers that will display content over existing content just below and to the right of the cursor position
February 2014
javascript - Use Greasemonkey to replace links, to images, with images? - Stack Overflow
Replacing links to images is not too hard to do. However, I recommend that you keep the link but display the picture inside it. This is so you can click through if something goes wrong. For example, that sample page you gave has most of the linked images on a dead site.
Other linked images only look like they point to images or might be blocked for "hot linking".
To make the code robust and easy, we use jQuery and waitForKeyElements.
Here is a complete working script that delinks the payload image-links on that sample site:
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