Dynamic Image Map Based on Pixel Colour

I created a html image map which creates dynamic links based on the color of the pixel that the user clicked. The reason for creating this was because the map was a vector map of the world and as you know all countries have varying sizes and it would be impossible to create a normal point/array based image map. * It loads really fast * No need to know what areas of the image are covered by what for links * Image areas can be any shape or size