Working With Image Coordinates And Dynamic Linking.

I have a page with a large centre-aligned image on it. I want a
functionality whereby users can click their mouse on any point in this
image and it would then show a virtual mouse pointer at the place where
they clicked it. If they were to click somewhere else, the position of
the virtual cursor would change.

The position of the cursor needs to dynamically generate a link and
display it in a form field text edit box.

If that link is then viewed separately, it would launch the same page
with the virtual mouse pointer at the location where the original
person placed it.

Basically I want to be able to have one guy point to a location on the
image for the benefit of another guy, but graphically as opposed to
relying on written explanation.