Hi David,
To accomplish this you'll need to use Mouse-over Action Settings and Extra
Slides.
To see how it's done, see:
http://www.pptmagic.com/articles/mouseoverheat.htm
http://officeone.mvps.org/ppttips/mouse_over_effect.html

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Thanks,
Glenna Shaw
Microsoft PowerPoint MVP Team
http://www.pptmagic.com
> Hi,
>
> I have an organisational chart produced in PowerPoint and would like to be
> able to scroll over each name and designation which is within a text box so
> that their photograph appears in the text box.