Toggle Multiple Images - Number Of Images Placed On A Map ?

I have a number of images placed on a map (the images are dots indicating a location)

When clicked, that displays different textual information somewhere on the page. View here and click the dots on the map for what I am trying to explain: [url]

What I want to do now is to toggle these dots so that when clicked, the dot turns white. This I could do with some code I found on the net. However, I need it to toggle all images. In that if one image has been clicked and turned white, and then the user clicks a different black ot, then that black dot should turn white, and the white dot should turn back clack.