Mouseover links in page content change the image displayed in fixed box?

Mouseover links in page content change the image displayed in fixed box?


Sorry if this isn't the correct place to post this, but I have been
hunting around to find examples/code for what I assume is an insanely
simple jQuery function... to have hyperlinks within the content of a
page that, when moused over, would change an image displayed in a
fixed box on the same page (ideally with a fade in/out or some other
effect).
Is there already a plugin that does this? Or is this so insanely
simple that it's just "standard" jQuery code?
Thanks for your help!
- John