Hot links

Hello.

I found a lot of hot-links in the form, for example:
<img src='http://www.my-works.org/images/faces/wave1.gif' />
that points directly on the images on my site.

Actually I deny this type of links by using RewriteRule Apache meccanism.

I would like anyway, to send a javascript to browser as a response of this
type
of request. This javascript should create the image on-fly directly on
browser site.

How can I do it?

Thanks
Misha