to synchronize
					// the main window
					function synchronizeMainWindow() {

						if( !silenced ) {
							var indices = currentSlide.contentWindow.Reveal.getIndices();
							window.opener.Reveal.slide( indices.h, indices.v, indices.f );
						}

					}

					// Navigate the main window when the notes slide changes
					currentSlide.contentWindow.Reveal.addEventListener( 'slidechanged', synchronizeMainWindow );
					currentSlide.contentWindow.Reveal.addEventListener( 'fragmentshown', synchronizeMainWin