Using images to track user

Hi all,
I basically am developing an application in java/jsp to send emails to people (it's not spam, trust me). The trouble is that lately a vendor told some of our executives that his application uses images to see if a user has opened the email or not. He claimed to have been able to do this on hotmail, yahoo n all...
Does anyone know how this can be done? I tried to use JavaScript to open a window onLoad that sent a queryString to a webpage on my server with the client username, then use jsp to log that into the database and then close the window. Sounds great in theory but Yahoo as well as Hotmail block JavaScript.
I realise this is more a web development based question, but I have been searching on-line all day and haven't found anything to help. So if someone can at least point me in the right direction that would be great.
Al
p.s I know that being able to do this is an invasion of privacy and all that jazz, and I am strictly against it, but I gotta eat...

Thanks all,
Interestingly enough, the missing piece of the puzzle came from a completely unrelated project for me, what J-Fine said was it actually, along with the fact that you are supposed to set the page context to the image type you are using.
This is how I'm doing it, I don't know how efficient it is, but my understanding is that using BufferedInput is always good (mind you I haven't tried it since I'm at home and still downloading j2ee):
          InputStream in = new BufferedInputStream(new FileInputStream("myImage.gif"));
          res.setContentType ( "image/gif" );
          ServletOutputStream out = res.getOutputStream ();
          int c;
          while((c = in.read()) != -1)
               out.write(c);
          in.close();
          out.close();
Thanks again all...
Good news is that we decided not to implement this... so I save my sole for an other time.
Al

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