It's very simple, no need for a script just basic HTML. All you do is create an image map for your image and add 'title=".."' tags inside each <area ...> tag like this:
Code:
<img src="YourImage.jpg" alt="!" usemap="#numbers">
<map name="numbers">
<area shape="circle" coords="x1,y1,radius1" href=".." title="1">
<area shape="circle" coords="x2,y2,radius2" href=".." title="2">
<area shape="circle" coords="x3,y3,radius3" href=".." title="3">
<!-- etc. etc.-->
</map>
More info here.
Edited to add: I looked at the source code of your page and noticed that the image is linked to a map named "model" but you have no such map in your page. The map immediately after the image is named "homepage", so won't work!
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