Hi Roger,
The easiest way to do is to create a text box with an X in it and set a
hyperlink on the X to jump to the other slide. Set your color scheme so that
your hyperlink color matches the background color of the text box (which
makes the X disappear) and your followed hyperlink color as something
different. When someone clicks inside the box, the X shows up and you jump
to the desired slide.
It's a common technique used for PowerPoint Jeopardy games. Echo has a copy
on her web site at:
http://www.echosvoice.com/jeopardy.htm
Glenna