If you want to use CSS3, I would suggest that you try using the target psuedo class. If you specify the href of one of the links as the name of one of your divs following a # you can then specify style to be active only when the pages URL has the fragment of a # followed by your div’s name.
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#mydiv{color:red;}
#mydiv:target{color:blue}
When you click the link in the above example, the font color should be altered until you click on another link.
