How do I invert the projected image?

• Do the following:
  1. Turn on the projector.
  2. Press the Menu button on the remote control.
  3. Open the Extended menu, then select Projection.
  4. Select Front/Ceiling.
  5. Press the Menu button when done.
  Note: You can also invert the picture by pressing the  A/V mute button for about five seconds.
  
  When the projector is mounted on the ceiling, the left and right speakers are on opposite sides and the stereo output is reversed. To fix the stereo output, reverse the left and right audio inputs to the projector.
  
  When an iPod, iPhone, iPad, or iPod touch is docked, the Projection setting is locked to Front. To change the setting, first exit the menu and remove the iPod from the dock.