Tracking a requested image

I have an image on our webserver I'm using for tracking purposes. I was wondering is it possible to set up a program running along the webserver to listen out for when the image has been requested. Also would it possible to retrieve the request attributes like the id value. Here is an example of the HTML for the image:
<img src="http://www.lloydnorthover.com/images/tracker.gif?id=gn15325">
I'd really appreciate some help on this one. Can somebody point me in the right direction as in what packages or classes I need to look at to resolve my issue.
Thanks

Just to let everyone know, I'm using Tomcat 4.0 as the webserver.

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Hi,
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