Take a look at the tutorial I wrote on "Control the Heat with Mouse-overs"
and download the associated template. It's using mouse-overs, but the
concept is the same. Replace the thermometer with a menu bar and instead
of
mouse-over action settings use On Click action settings.
The link is: http://www.pptmagic.com/articles.htm

thanks for helping me but I tried and couldn't make it work as I wanted. I
know the way how to do this without using master slide, but I guess there is
a better way to create such a menu bar of highlighted topics while viewing
related slide using master slide especially when you have lots of slides
(e.g. 10 topics and 40slides). If you know how to do that please send me on
email an example of a few slides.