Viewer Instructions:  
  
    -  Click 
      and move the mouse to pan and tilt
 
    -  While 
      panning, use control and shift keys to zoom in and out.
 
    -  Alternatively, 
      use the arrow keys for panning and tilting in fixed increments.
 
    -  Use 
      + and -, or > and < keys to zoom in fixed increments.