获取图像特定区域的所有多边形坐标？

I have an image were I put links and text with html image map. That works fine. I would like to have some hover effect on specific areas of the image. For example take a world map and when you hover over a country that one get highlighted. With the html image map and some css it is not a problem, that is, if you have a list of all polygon coordinates of all countries.I have an image were I put links and text with