text: /**
   * Handles opening of and synchronization with the reveal.js
   * notes window.
   */
  var RevealNotes = (function() {
  
  	function openNotes() {
  		var jsFileLocation = document.querySelector('script[src$="notes.js"]').src;  // this js file path
  		jsFileLocation = jsFileLocation.replace(/notes\.js(\?.*)?$/, '');   // the js folder path
  		var notesPopup = window.open( jsFileLocation + 'notes.html', 'reveal.js - Notes', 'width=1120,height=850' );
  
  		// Fires when slide is changed
  		Reveal.addEventListener( 'slidechanged', function( event ) {
  			post('slidechanged');
  		} );
  
  		// Fires when a fragment is shown
  		Reveal.addEventListener( 'fragmentshown', function( event ) {
  			post('fragmentshown');
  		} );
  
  		// Fires when a fragment is hidden
  		Reveal.addEventListener( 'fragmenthidden', function( event ) {
  			post('fragmenthidden');
  		} );
  
  		/**
  		 * Posts the current slide data to the notes window
  		 *
  		 * @param {String} eventType Expecting 'slidechanged', 'fragmentshown' 
  		 * or 'fragmenthidden' set in the events above to define the needed 
  		 * slideDate.
  		 */
  		function post( eventType ) {
  			var slideElement = Reveal.getCurrentSlide(),
  				messageData;
  
  			if( eventType === 'slidechanged' ) {
  				var notes = slideElement.querySelector( 'aside.notes' ),
  					indexh = Reveal.getIndices().h,
  					indexv = Reveal.getIndices().v,
  					nextindexh,
  					nextindexv;
  
  				if( slideElement.nextElementSibling && slideElement.parentNode.nodeName == 'SECTION' ) {
  					nextindexh = indexh;
  					nextindexv = indexv + 1;
  				} else {
  					nextindexh = indexh + 1;
  					nextindexv = 0;
  				}
  
  				messageData = {
  					notes : notes ? notes.innerHTML : '',
  					indexh : indexh,
  					indexv : indexv,
  					nextindexh : nextindexh,
  					nextindexv : nextindexv,
  					markdown : notes ? typeof notes.getAttribute( 'data-markdown' ) === 'string' : false
  				};
  			}
  			else if( eventType === 'fragmentshown' ) {
  				messageData = {
  					fragment : 'next'
  				};
  			}
  			else if( eventType === 'fragmenthidden' ) {
  				messageData = {
  					fragment : 'prev'
  				};
  			}
  
  			notesPopup.postMessage( JSON.stringify( messageData ), '*' );
  		}
  
  		// Navigate to the current slide when the notes are loaded
  		notesPopup.addEventListener( 'load', function( event ) {
  			post('slidechanged');
  		}, false );
  	}
  
  	// If the there's a 'notes' query set, open directly
  	if( window.location.search.match( /(\?|\&)notes/gi ) !== null ) {
  		openNotes();
  	}
  
  	// Open the notes when the 's' key is hit
  	document.addEventListener( 'keydown', function( event ) {
  		// Disregard the event if the target is editable or a
  		// modifier is present
  		if ( document.querySelector( ':focus' ) !== null || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
  
  		if( event.keyCode === 83 ) {
  			event.preventDefault();
  			openNotes();
  		}
  	}, false );
  
  	return { open: openNotes };
  })();
  