In Visio 2k3 you can select the shape then ctrl + H will flip it hoizontally
so it faces the other direction.
You can also right click on the shape and then expand the shape menu for
otherways to rotate/flip your shape
Ctrl + L will rotate 90° to the left (anti-clockwise)
Ctrl + R will rotate 90° to the right (Clockwise)
Ctrl + V flips vertically
Hope this helps
Paul