Hyperlinks and Buttons
The beamer command that will produce a button to jump from
a current slide to a target slide is
\hyperlink{target}{button text}<hoverlay specificationi>.
It goes in the frame that produces the current slide. If that
frame produces more than one slide, the overlay specification
determine on which slide(s) the button appears and the
command must be so placed that it will be included in the fist
slide in the list. There are many different buttons to indicate
the type of jump that will occur when clicking the button, such
as skipping the next slide, skipping all remaining slides
produced from the current frame, or returning to an earlier
slide. The next slides presents the choices for button text.
Clifford E. Weil The beamer Class