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werty - 7:49 pm on Oct 27, 2003 (gmt 0)
The reason the image is used, is to track impressions of the ad. I tend to push mostly through adwords and I do not use the image, just the url with the domain as the IP. My impressions are zero on cj, and my clicks(adwords, and CJ) match.
From my understanding a cookie is assigned to the browser when it hits qksrv.net, it then redirects to the site and adds a tracking url.