I have a new TiddlerWiki with only this one Tiddler.
<img src="http://www.w3schools.com/tags/planets.gif" width="145" height="126" alt="Planets" usemap="#planetmap" class="pretty">
<map name="planetmap">
<area shape="rect" coords="0,0,82,126" alt="Sun" title="Sun" href="#Solutions">
<area shape="circle" coords="90,58,3" alt="Mercury" title="Mercury" href="#Markup">
<area shape="circle" coords="124,58,8" alt="Venus" title="Venus" href="#Variables%20vs.%20Parameters">
</map>
I close the open links immediately, as I later use a plugin that only displays one open twiddly at a time.
The links only work once, then I have to click on another one, after which the previous one works again.
Example:
click sun - ok
click sun - false
click Mercury - ok
click Mercury - false
click Sun - ok
click Mercury - ok
click Sun - ok
click Mercury - ok