Plugin/Widget that puts images into sidebar?

Hello, I have been seeking a plugin/widget that would allow a user to click a text link (or possibly a thumbnail) within the body of the page that would cause an image to appear in the sidebar, without leaving or re-loading the page.

I find it hard to believe that I’m the first WP user who ever wanted to do this, but I have spent hours searching through the plugins, and have found nothing.

Thanks in advance!