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', post );

		// Fires when a fragment is shown
		Reveal.addEventListener( 'fragmentshown', post );

		// Fires when a fragment is hidden
		Reveal.addEventListener( 'fragmenthidden', post );

		/**
		 * Posts the current slide data to the notes window
		 */
		function post() {
			var slideElement = Reveal.getCurrentSlide(),
				slideIndices = Reveal.getIndices(),
				messageData;

			var notes = slideElement.querySelector( 'aside.notes' ),
				nextindexh,
				nextindexv;

			if( slideElement.nextElementSibling && slideElement.parentNode.nodeName == 'SECTION' ) {
				nextindexh = slideIndices.h;
				nextindexv = slideIndices.v + 1;
			} else {
				nextindexh = slideIndices.h + 1;
				nextindexv = 0;
			}

			messageData = {
				notes : notes ? notes.innerHTML : '',
				indexh : slideIndices.h,
				indexv : slideIndices.v,
				indexf : slideIndices.f,
				nextindexh : nextindexh,
				nextindexv : nextindexv,
				markdown : notes ? typeof notes.getAttribute( 'data-markdown' ) === 'string' : false
			};

			notesPopup.postMessage( JSON.stringify( messageData ), '*' );
		}

		// Navigate to the current slide when the notes are loaded
		notesPopup.addEventListener( 'load', function( event ) {
			post();
		}, false );
	}
Handles opening of and synchronization with the reveal.js
notes window.