I know it's being a long time, but I am trying to achieve the same functionality, when using the image Map editor, how do I add a tumbnail image and header to that tooltip that appears on Hover?
Right now, the Image editor option contains only URL and nothing more than that, is it possible to add more properties ? for example: thumbnail image, header and summary. the result will be similar to google maps.
"border-width: 0px; border-style: solid;"
Sorry for the late reply. I will try that and see if works.