/*** PTViewer built-in functions ***/
function DoUp()
{
  ptviewer.startAutoPan( 0.0, 0.15, 1.0 );
}
function DoDown()
{
  ptviewer.startAutoPan( 0.0, -0.15, 1.0 );
}
function DoLeftAuto()
{
  ptviewer.startAutoPan( -0.15, 0.0, 1.0 );
}
function DoRightAuto()
{
  ptviewer.startAutoPan( 0.15, 0.0, 1.0 );
}
function DoZoomIn()
{
  ptviewer.startAutoPan( 0.0, 0.0, 1.0/1.004 );
}
function DoZoomOut()
{
  ptviewer.startAutoPan( 0.0, 0.0, 1.004 );
}
function DoStop()
{
  ptviewer.stopAutoPan();
}
function DoReset()
{
  location.reload(true);
}