The document.write() simply adds an img-tag to the site and the browser will try to load the image from that URL.
The purpose is that an image is automatically retrieved by the browser; in the example the cookie details are set in the querystring to that URL, and so the attacker gets the URL, gets the cookie, and therefor gets the details required for authentication.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.