Indeed. But there seems no to be no (more?) js file involved, as the source shows that there is only a 1x1 px picture in the browser, and nothing more (tested with Pale Moon -with and without js/cookies blocking-, Midori, Dillo and Lynx).
The use of a 1x1 px picture is another weird thing. I thought it was only used by spammers, and only during the old/dinosauresque era of the first generations of Outlook Express