text: /*!
   * reveal.js 1.3
   * http://lab.hakim.se/reveal-js
   * MIT licensed
   * 
   * Copyright (C) 2012 Hakim El Hattab, http://hakim.se
   */
  var Reveal = (function(){
  	
  	var HORIZONTAL_SLIDES_SELECTOR = '#reveal .slides>section',
  		VERTICAL_SLIDES_SELECTOR = '#reveal .slides>section.present>section',
  
  		// The horizontal and verical index of the currently active slide
  		indexh = 0,
  		indexv = 0,
  
  		// Configurations options, can be overridden at initialization time 
  		config = {
  			controls: false,
  			progress: false,
  			history: false,
  			loop: false,
  			mouseWheel: true,
  			rollingLinks: true,
  			transition: 'default',
  			theme: 'default'
  		},
  
  		// Slides may hold a data-state attribute which we pick up and apply 
  		// as a class to the body. This list contains the combined state of 
  		// all current slides.
  		state = [],
  
  		// Cached references to DOM elements
  		dom = {},
  
  		// Detect support for CSS 3D transforms
  		supports3DTransforms =  document.body.style['perspectiveProperty'] !== undefined ||
  								document.body.style['WebkitPerspective'] !== undefined || 
                          		document.body.style['MozPerspective'] !== undefined ||
                          		document.body.style['msPerspective'] !== undefined ||
                          		document.body.style['OPerspective'] !== undefined,
          
          supports2DTransforms =  document.body.style['transformProperty'] !== undefined ||
  								document.body.style['WebkitTransform'] !== undefined || 
                          		document.body.style['MozTransform'] !== undefined ||
                          		document.body.style['msTransform'] !== undefined ||
                          		document.body.style['OTransform'] !== undefined,
  		
  		// Throttles mouse wheel navigation
  		mouseWheelTimeout = 0,
  
  		// Delays updates to the URL due to a Chrome thumbnailer bug
  		writeURLTimeout = 0;
  	
  	/**
  	 * Starts up the slideshow by applying configuration
  	 * options and binding various events.
  	 */
  	function initialize( options ) {
  		
  		if( !supports2DTransforms && !supports3DTransforms ) {
  			document.body.setAttribute( 'class', 'no-transforms' );
  
  			// If the browser doesn't support transforms we won't be 
  			// using JavaScript to control the presentation
  			return;
  		}
  
  		// Cache references to DOM elements
  		dom.wrapper = document.querySelector( '#reveal' );
  		dom.progress = document.querySelector( '#reveal .progress' );
  		dom.progressbar = document.querySelector( '#reveal .progress span' );
  		dom.controls = document.querySelector( '#reveal .controls' );
  		dom.controlsLeft = document.querySelector( '#reveal .controls .left' );
  		dom.controlsRight = document.querySelector( '#reveal .controls .right' );
  		dom.controlsUp = document.querySelector( '#reveal .controls .up' );
  		dom.controlsDown = document.querySelector( '#reveal .controls .down' );
  
  		// Bind all view events
  		document.addEventListener('keydown', onDocumentKeyDown, false);
  		document.addEventListener('touchstart', onDocumentTouchStart, false);
  		window.addEventListener('hashchange', onWindowHashChange, false);
  		dom.controlsLeft.addEventListener('click', preventAndForward( navigateLeft ), false);
  		dom.controlsRight.addEventListener('click', preventAndForward( navigateRight ), false);
  		dom.controlsUp.addEventListener('click', preventAndForward( navigateUp ), false);
  		dom.controlsDown.addEventListener('click', preventAndForward( navigateDown ), false);
  
  		// Copy options over to our config object
  		extend( config, options );
  
  		// Fall back on the 2D transform theme 'linear'
  		if( supports3DTransforms === false ) {
  			config.transition = 'linear';
  		}
  
  		if( config.controls ) {
  			dom.controls.style.display = 'block';
  		}
  
  		if( config.progress ) {
  			dom.progress.style.display = 'block';
  		}
  
  		if( config.transition !== 'default' ) {
  			dom.wrapper.classList.add( config.transition );
  		}
  
  		if( config.theme !== 'default' ) {
  			dom.wrapper.classList.add( config.theme );
  		}
  
  		if( config.mouseWheel ) {
  			document.addEventListener('DOMMouseScroll', onDocumentMouseScroll, false); // FF
  			document.addEventListener('mousewheel', onDocumentMouseScroll, false);
  		}
  
  		if( config.rollingLinks ) {
  			// Add some 3D magic to our anchors
  			linkify();
  		}
  
  		// Read the initial hash
  		readURL();
  	}
  
  	/**
  	 * Extend object a with the properties of object b. 
  	 * If there's a conflict, object b takes precedence.
  	 */
  	function extend( a, b ) {
  		for( var i in b ) {
  			a[ i ] = b[ i ];
  		}
  	}
  
  	/**
  	 * Prevents an events defaults behavior calls the 
  	 * specified delegate.
  	 * 
  	 * @param {Function} delegate The method to call 
  	 * after the wrapper has been executed
  	 */
  	function preventAndForward( delegate ) {
  		return function( event ) {
  			event.preventDefault();
  			delegate.call();
  		}
  	}
  	
  	/**
  	 * Handler for the document level 'keydown' event.
  	 * 
  	 * @param {Object} event
  	 */
  	function onDocumentKeyDown( event ) {
  		// FFT: Use document.querySelector( ':focus' ) === null 
  		// instead of checking contentEditable?
  
  		// Disregard the event if the target is editable or a 
  		// modifier is present
  		if ( event.target.contentEditable != 'inherit' || event.shiftKey || event.altKey || event.ctrlKey || event.metaKey ) return;
  				
  		var triggered = false;
  
  		switch( event.keyCode ) {
  			// p, page up
  			case 80: case 33: navigatePrev(); triggered = true; break; 
  			// n, page down, space
  			case 78: case 32: case 34: navigateNext(); triggered = true; break;
  			// h, left
  			case 72: case 37: navigateLeft(); triggered = true; break;
  			// l, right
  			case 76: case 39: navigateRight(); triggered = true; break;
  			// k, up
  			case 75: case 38: navigateUp(); triggered = true; break;
  			// j, down
  			case 74: case 40: navigateDown(); triggered = true; break;
  		}
  
  		if( triggered ) {
  			event.preventDefault();
  		}
  		else if ( event.keyCode === 27 && supports3DTransforms ) {
  			if( overviewIsActive() ) {
  				deactivateOverview();
  			}
  			else {
  				activateOverview();
  			}
  	
  			event.preventDefault();
  		}
  
  	}
  	
  	/**
  	 * Handler for the document level 'touchstart' event.
  	 * 
  	 * This enables very basic tap interaction for touch
  	 * devices. Added mainly for performance testing of 3D
  	 * transforms on iOS but was so happily surprised with
  	 * how smoothly it runs so I left it in here. Apple +1
  	 * 
  	 * @param {Object} event
  	 */
  	function onDocumentTouchStart( event ) {
  		// We're only interested in one point taps
  		if (event.touches.length === 1) {
  			// Never prevent taps on anchors and images
  			if( event.target.tagName.toLowerCase() === 'a' || event.target.tagName.toLowerCase() === 'img' ) {
  				return;
  			}
  			
  			event.preventDefault();
  			
  			var point = {
  				x: event.touches[0].clientX,
  				y: event.touches[0].clientY
  			};
  			
  			// Define the extent of the areas that may be tapped
  			// to navigate
  			var wt = window.innerWidth * 0.3;
  			var ht = window.innerHeight * 0.3;
  			
  			if( point.x < wt ) {
  				navigateLeft();
  			}
  			else if( point.x > window.innerWidth - wt ) {
  				navigateRight();
  			}
  			else if( point.y < ht ) {
  				navigateUp();
  			}
  			else if( point.y > window.innerHeight - ht ) {
  				navigateDown();
  			}
  			
  			slide();
  		}
  	}
  
  
  	/**
  	 * Handles mouse wheel scrolling, throttled to avoid 
  	 * skipping multiple slides.
  	 */
  	function onDocumentMouseScroll( event ){
  		clearTimeout( mouseWheelTimeout );
  
  		mouseWheelTimeout = setTimeout( function() {
  			var delta = event.detail || -event.wheelDelta;
  			if( delta > 0 ) {
  				navigateNext();
  			}
  			else {
  				navigatePrev();
  			}
  		}, 100 );
  	}
  	
  	/**
  	 * Handler for the window level 'hashchange' event.
  	 * 
  	 * @param {Object} event
  	 */
  	function onWindowHashChange( event ) {
  		readURL();
  	}
  
  	/**
  	 * Wrap all links in 3D goodness.
  	 */
  	function linkify() {
          if( supports3DTransforms ) {
          	var nodes = document.querySelectorAll( '#reveal .slides section a:not(.image)' );
  
  	        for( var i = 0, len = nodes.length; i < len; i++ ) {
  	            var node = nodes[i];
  	            
  	            if( node.textContent && !node.querySelector( 'img' ) && ( !node.className || !node.classList.contains( node, 'roll' ) ) ) {
  	                node.classList.add( 'roll' );
  	                node.innerHTML = '<span data-title="'+ node.text +'">' + node.innerHTML + '</span>';
  	            }
  	        };
          }
  	}
  
  	/**
  	 * Displays the overview of slides (quick nav) by 
  	 * scaling down and arranging all slide elements.
  	 * 
  	 * Experimental feature, might be dropped if perf 
  	 * can't be improved.
  	 */
  	function activateOverview() {
  		dom.wrapper.classList.add( 'overview' );
  
  		var horizontalSlides = Array.prototype.slice.call( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ) );
  
  		for( var i = 0, len1 = horizontalSlides.length; i < len1; i++ ) {
  			var hslide = horizontalSlides[i],
  				htransform = 'translateZ(-2500px) translate(' + ( ( i - indexh ) * 105 ) + '%, 0%)';
  			
  			hslide.setAttribute( 'data-index-h', i );
  			hslide.style.display = 'block';
  			hslide.style.WebkitTransform = htransform;
  			hslide.style.MozTransform = htransform;
  			hslide.style.msTransform = htransform;
  			hslide.style.OTransform = htransform;
  			hslide.style.transform = htransform;
  
  			if( !hslide.classList.contains( 'stack' ) ) {
  				// Navigate to this slide on click
  				hslide.addEventListener( 'click', onOverviewSlideClicked, true );
  			}
  
  			var verticalSlides = Array.prototype.slice.call( hslide.querySelectorAll( 'section' ) );
  
  			for( var j = 0, len2 = verticalSlides.length; j < len2; j++ ) {
  				var vslide = verticalSlides[j],
  					vtransform = 'translate(0%, ' + ( ( j - indexv ) * 105 ) + '%)';
  
  				vslide.setAttribute( 'data-index-h', i );
  				vslide.setAttribute( 'data-index-v', j );
  				vslide.style.display = 'block';
  				vslide.style.WebkitTransform = vtransform;
  				vslide.style.MozTransform = vtransform;
  				vslide.style.msTransform = vtransform;
  				vslide.style.OTransform = vtransform;
  				vslide.style.transform = vtransform;
  
  				// Navigate to this slide on click
  				vslide.addEventListener( 'click', onOverviewSlideClicked, true );
  			}
  		}
  	}
  	
  	/**
  	 * Exits the slide overview and enters the currently
  	 * active slide.
  	 */
  	function deactivateOverview() {
  		dom.wrapper.classList.remove( 'overview' );
  
  		var slides = Array.prototype.slice.call( document.querySelectorAll( '#reveal .slides section' ) );
  
  		for( var i = 0, len = slides.length; i < len; i++ ) {
  			var element = slides[i];
  
  			// Resets all transforms to use the external styles
  			element.style.WebkitTransform = '';
  			element.style.MozTransform = '';
  			element.style.msTransform = '';
  			element.style.OTransform = '';
  			element.style.transform = '';
  
  			element.removeEventListener( 'click', onOverviewSlideClicked );
  		}
  
  		slide();
  	}
  
  	/**
  	 * Checks if the overview is currently active.
  	 * 
  	 * @return {Boolean} true if the overview is active,
  	 * false otherwise
  	 */
  	function overviewIsActive() {
  		return dom.wrapper.classList.contains( 'overview' );
  	}
  
  	/**
  	 * Invoked when a slide is and we're in the overview.
  	 */
  	function onOverviewSlideClicked( event ) {
  		// TODO There's a bug here where the event listeners are not 
  		// removed after deactivating the overview.
  		if( overviewIsActive() ) {
  			event.preventDefault();
  
  			deactivateOverview();
  
  			indexh = this.getAttribute( 'data-index-h' );
  			indexv = this.getAttribute( 'data-index-v' );
  
  			slide();
  		}
  	}
  
  	/**
  	 * Updates one dimension of slides by showing the slide
  	 * with the specified index.
  	 * 
  	 * @param {String} selector A CSS selector that will fetch
  	 * the group of slides we are working with
  	 * @param {Number} index The index of the slide that should be
  	 * shown
  	 * 
  	 * @return {Number} The index of the slide that is now shown,
  	 * might differ from the passed in index if it was out of 
  	 * bounds.
  	 */
  	function updateSlides( selector, index ) {
  		
  		// Select all slides and convert the NodeList result to
  		// an array
  		var slides = Array.prototype.slice.call( document.querySelectorAll( selector ) ),
  			slidesLength = slides.length;
  		
  		if( slidesLength ) {
  
  			// Should the index loop?
  			if( config.loop ) {
  				index %= slidesLength;
  
  				if( index < 0 ) {
  					index = slidesLength + index;
  				}
  			}
  			
  			// Enforce max and minimum index bounds
  			index = Math.max( Math.min( index, slidesLength - 1 ), 0 );
  			
  			for( var i = 0; i < slidesLength; i++ ) {
  				var slide = slides[i];
  
  				// Optimization; hide all slides that are three or more steps 
  				// away from the present slide
  				if( overviewIsActive() === false ) {
  					// The distance loops so that it measures 1 between the first
  					// and last slides
  					var distance = Math.abs( ( index - i ) % ( slidesLength - 3 ) ) || 0;
  
  					slide.style.display = distance > 3 ? 'none' : 'block';
  				}
  
  				slides[i].classList.remove( 'past' );
  				slides[i].classList.remove( 'present' );
  				slides[i].classList.remove( 'future' );
  
  				if( i < index ) {
  					// Any element previous to index is given the 'past' class
  					slides[i].classList.add( 'past' );
  				}
  				else if( i > index ) {
  					// Any element subsequent to index is given the 'future' class
  					slides[i].classList.add( 'future' );
  				}
  
  				// If this element contains vertical slides
  				if( slide.querySelector( 'section' ) ) {
  					slides[i].classList.add( 'stack' );
  				}
  			}
  
  			// Mark the current slide as present
  			slides[index].classList.add( 'present' );
  
  			// If this slide has a state associated with it, add it
  			// onto the current state of the deck
  			var slideState = slides[index].dataset.state;
  			if( slideState ) {
  				state = state.concat( slideState.split( ' ' ) );
  			}
  		}
  		else {
  			// Since there are no slides we can't be anywhere beyond the 
  			// zeroth index
  			index = 0;
  		}
  		
  		return index;
  		
  	}
  	
  	/**
  	 * Updates the visual slides to represent the currently
  	 * set indices. 
  	 */
  	function slide() {
  		// Remember the state before this slide
  		var stateBefore = state.concat();
  
  		// Reset the state array
  		state.length = 0;
  
  		// Activate and transition to the new slide
  		indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, indexh );
  		indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, indexv );
  
  		// Apply the new state
  		stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
  			// Check if this state existed on the previous slide. If it 
  			// did, we will avoid adding it repeatedly.
  			for( var j = 0; j < stateBefore.length; j++ ) {
  				if( stateBefore[j] === state[i] ) {
  					stateBefore.splice( j, 1 );
  					continue stateLoop;
  				}
  			}
  
  			document.documentElement.classList.add( state[i] );
  
  			// Dispatch custom event
  			var event = document.createEvent( "HTMLEvents" );
  			event.initEvent( state[i], true, true );
  			document.dispatchEvent( event );
  		}
  
  		// Clean up the remaints of the previous state
  		while( stateBefore.length ) {
  			document.documentElement.classList.remove( stateBefore.pop() );
  		}
  
  		// Update progress if enabled
  		if( config.progress ) {
  			dom.progressbar.style.width = ( indexh / ( document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR ).length - 1 ) ) * window.innerWidth + 'px';
  		}
  
  		// Close the overview if it's active
  		if( overviewIsActive() ) {
  			activateOverview();
  		}
  
  		updateControls();
  		
  		clearTimeout( writeURLTimeout );
  		writeURLTimeout = setTimeout( writeURL, 1500 );
  	}
  
  	/**
  	 * Updates the state and link pointers of the controls.
  	 */
  	function updateControls() {
  		var routes = availableRoutes();
  
  		// Remove the 'enabled' class from all directions
  		[ dom.controlsLeft, dom.controlsRight, dom.controlsUp, dom.controlsDown ].forEach( function( node ) {
  			node.classList.remove( 'enabled' );
  		} )
  
  		if( routes.left ) dom.controlsLeft.classList.add( 'enabled' );
  		if( routes.right ) dom.controlsRight.classList.add( 'enabled' );
  		if( routes.up ) dom.controlsUp.classList.add( 'enabled' );
  		if( routes.down ) dom.controlsDown.classList.add( 'enabled' );
  	}
  
  	/**
  	 * Determine what available routes there are for navigation.
  	 * 
  	 * @return {Object} containing four booleans: left/right/up/down
  	 */
  	function availableRoutes() {
  		var horizontalSlides = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR );
  		var verticalSlides = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR );
  
  		return {
  			left: indexh > 0,
  			right: indexh < horizontalSlides.length - 1,
  			up: indexv > 0,
  			down: indexv < verticalSlides.length - 1
  		};
  	}
  	
  	/**
  	 * Reads the current URL (hash) and navigates accordingly.
  	 */
  	function readURL() {
  		// Break the hash down to separate components
  		var bits = window.location.hash.slice(2).split('/');
  		
  		// Read the index components of the hash
  		indexh = parseInt( bits[0] ) || 0 ;
  		indexv = parseInt( bits[1] ) || 0 ;
  		
  		navigateTo( indexh, indexv );
  	}
  	
  	/**
  	 * Updates the page URL (hash) to reflect the current
  	 * state. 
  	 */
  	function writeURL() {
  		if( config.history ) {
  			var url = '/';
  			
  			// Only include the minimum possible number of components in
  			// the URL
  			if( indexh > 0 || indexv > 0 ) url += indexh;
  			if( indexv > 0 ) url += '/' + indexv;
  			
  			window.location.hash = url;
  		}
  	}
  
  	/**
  	 * Navigate to the next slide fragment.
  	 * 
  	 * @return {Boolean} true if there was a next fragment,
  	 * false otherwise
  	 */
  	function nextFragment() {
  		// Vertical slides:
  		if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
  			var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
  			if( verticalFragments.length ) {
  				verticalFragments[0].classList.add( 'visible' );
  				return true;
  			}
  		}
  		// Horizontal slides:
  		else {
  			var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
  			if( horizontalFragments.length ) {
  				horizontalFragments[0].classList.add( 'visible' );
  				return true;
  			}
  		}
  
  		return false;
  	}
  
  	/**
  	 * Navigate to the previous slide fragment.
  	 * 
  	 * @return {Boolean} true if there was a previous fragment,
  	 * false otherwise
  	 */
  	function previousFragment() {
  		// Vertical slides:
  		if( document.querySelector( VERTICAL_SLIDES_SELECTOR + '.present' ) ) {
  			var verticalFragments = document.querySelectorAll( VERTICAL_SLIDES_SELECTOR + '.present .fragment.visible' );
  			if( verticalFragments.length ) {
  				verticalFragments[ verticalFragments.length - 1 ].classList.remove( 'visible' );
  				return true;
  			}
  		}
  		// Horizontal slides:
  		else {
  			var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment.visible' );
  			if( horizontalFragments.length ) {
  				horizontalFragments[ horizontalFragments.length - 1 ].classList.remove( 'visible' );
  				return true;
  			}
  		}
  		
  		return false;
  	}
  	
  	/**
  	 * Triggers a navigation to the specified indices.
  	 * 
  	 * @param {Number} h The horizontal index of the slide to show
  	 * @param {Number} v The vertical index of the slide to show
  	 */
  	function navigateTo( h, v ) {
  		indexh = h === undefined ? indexh : h;
  		indexv = v === undefined ? indexv : v;
  		
  		slide();
  	}
  	
  	function navigateLeft() {
  		// Prioritize hiding fragments
  		if( overviewIsActive() || previousFragment() === false ) {
  			indexh --;
  			indexv = 0;
  			slide();
  		}
  	}
  	function navigateRight() {
  		// Prioritize revealing fragments
  		if( overviewIsActive() || nextFragment() === false ) {
  			indexh ++;
  			indexv = 0;
  			slide();
  		}
  	}
  	function navigateUp() {
  		// Prioritize hiding fragments
  		if( overviewIsActive() || previousFragment() === false ) {
  			indexv --;
  			slide();
  		}
  	}
  	function navigateDown() {
  		// Prioritize revealing fragments
  		if( overviewIsActive() || nextFragment() === false ) {
  			indexv ++;
  			slide();
  		}
  	}
  
  	/**
  	 * Navigates backwards, prioritized in the following order:
  	 * 1) Previous fragment
  	 * 2) Previous vertical slide
  	 * 3) Previous horizontal slide
  	 */
  	function navigatePrev() {
  		// Prioritize revealing fragments
  		if( previousFragment() === false ) {
  			if( availableRoutes().up ) {
  				navigateUp();
  			}
  			else {
  				// Fetch the previous horizontal slide, if there is one
  				var previousSlide = document.querySelector( '#reveal .slides>section.past:nth-child(' + indexh + ')' );
  
  				if( previousSlide ) {
  					indexv = ( previousSlide.querySelectorAll('section').length + 1 ) || 0;
  					indexh --;
  					slide();
  				}
  			}
  		}
  	}
  
  	/**
  	 * Same as #navigatePrev() but navigates forwards.
  	 */
  	function navigateNext() {
  		// Prioritize revealing fragments
  		if( nextFragment() === false ) {
  			availableRoutes().down ? navigateDown() : navigateRight();
  		}
  	}
  	
  	// Expose some methods publicly
  	return {
  		initialize: initialize,
  		navigateTo: navigateTo,
  		navigateLeft: navigateLeft,
  		navigateRight: navigateRight,
  		navigateUp: navigateUp,
  		navigateDown: navigateDown
  	};
  	
  })();
  
  