Hey anton- Yeah I've just done some fiddling around and found how u can do that. When you go to 'Add Placemark' Type in the name you want and there is a button that says 'NONE' next to your location name. Press that as shown in the foloing link
After that a whole pile of other ics will appear. Press the cutom button on the buttom as shown in the following image.Select the location of the image. It will resize it and even if you creaate a transparent GIF, it will not work. [url Any jpg will work from what I have found.. All the best mate. Hope that helped.
Elizabeth - Wello Kiter
