The way it works is this, whenever your browser requests an image or any file for that matter from a server information such as your IP address is sent to the server. It's your address on the World Wide Web, similar to a street address but for your computer. The internet wouldn't work without it. The company serving this image gets that info because you requested this image, they dynamically create the image and serve it as you see it.
The information you see is available to every website you visit, also bear in mind that no one else visiting this website will see your info. It changes for for every pageload from different people.
http://www.danasoft.com/
Nice sigan! 
