diff --git a/js/reveal.js b/js/reveal.js
index 15b695e..fc5164d 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -552,78 +552,82 @@ var Reveal = (function(){
 	 */
 	function layout() {
 
-		// Available space to scale within
-		var availableWidth = dom.wrapper.offsetWidth,
-			availableHeight = dom.wrapper.offsetHeight;
+		if( dom.wrapper ) {
 
-		// Reduce availabe space by margin
-		availableWidth -= ( availableHeight * config.margin );
-		availableHeight -= ( availableHeight * config.margin );
+			// Available space to scale within
+			var availableWidth = dom.wrapper.offsetWidth,
+				availableHeight = dom.wrapper.offsetHeight;
 
-		// Dimensions of the content
-		var slideWidth = config.width,
-			slideHeight = config.height;
+			// Reduce availabe space by margin
+			availableWidth -= ( availableHeight * config.margin );
+			availableHeight -= ( availableHeight * config.margin );
 
-		// Slide width may be a percentage of available width
-		if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
-			slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
-		}
+			// Dimensions of the content
+			var slideWidth = config.width,
+				slideHeight = config.height;
 
-		// Slide height may be a percentage of available height
-		if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
-			slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
-		}
+			// Slide width may be a percentage of available width
+			if( typeof slideWidth === 'string' && /%$/.test( slideWidth ) ) {
+				slideWidth = parseInt( slideWidth, 10 ) / 100 * availableWidth;
+			}
 
-		dom.slides.style.width = slideWidth + 'px';
-		dom.slides.style.height = slideHeight + 'px';
+			// Slide height may be a percentage of available height
+			if( typeof slideHeight === 'string' && /%$/.test( slideHeight ) ) {
+				slideHeight = parseInt( slideHeight, 10 ) / 100 * availableHeight;
+			}
 
-		// Determine scale of content to fit within available space
-		scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
+			dom.slides.style.width = slideWidth + 'px';
+			dom.slides.style.height = slideHeight + 'px';
 
-		// Respect max/min scale settings
-		scale = Math.max( scale, config.minScale );
-		scale = Math.min( scale, config.maxScale );
+			// Determine scale of content to fit within available space
+			scale = Math.min( availableWidth / slideWidth, availableHeight / slideHeight );
 
-		// Prefer applying scale via zoom since Chrome blurs scaled content
-		// with nested transforms
-		if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|android)/gi ) ) {
-			dom.slides.style.zoom = scale;
-		}
-		// Apply scale transform as a fallback
-		else {
-			var transform = 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)';
+			// Respect max/min scale settings
+			scale = Math.max( scale, config.minScale );
+			scale = Math.min( scale, config.maxScale );
 
-			dom.slides.style.WebkitTransform = transform;
-			dom.slides.style.MozTransform = transform;
-			dom.slides.style.msTransform = transform;
-			dom.slides.style.OTransform = transform;
-			dom.slides.style.transform = transform;
-		}
+			// Prefer applying scale via zoom since Chrome blurs scaled content
+			// with nested transforms
+			if( typeof dom.slides.style.zoom !== 'undefined' && !navigator.userAgent.match( /(iphone|ipod|ipad|android)/gi ) ) {
+				dom.slides.style.zoom = scale;
+			}
+			// Apply scale transform as a fallback
+			else {
+				var transform = 'translate(-50%, -50%) scale('+ scale +') translate(50%, 50%)';
 
-		if( config.center ) {
+				dom.slides.style.WebkitTransform = transform;
+				dom.slides.style.MozTransform = transform;
+				dom.slides.style.msTransform = transform;
+				dom.slides.style.OTransform = transform;
+				dom.slides.style.transform = transform;
+			}
 
-			// Select all slides, vertical and horizontal
-			var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
+			if( config.center ) {
 
-			// Determine the minimum top offset for slides
-			var minTop = -slideHeight / 2;
+				// Select all slides, vertical and horizontal
+				var slides = toArray( document.querySelectorAll( SLIDES_SELECTOR ) );
 
-			for( var i = 0, len = slides.length; i < len; i++ ) {
-				var slide = slides[ i ];
+				// Determine the minimum top offset for slides
+				var minTop = -slideHeight / 2;
 
-				// Don't bother updating invisible slides
-				if( slide.style.display === 'none' ) {
-					continue;
+				for( var i = 0, len = slides.length; i < len; i++ ) {
+					var slide = slides[ i ];
+
+					// Don't bother updating invisible slides
+					if( slide.style.display === 'none' ) {
+						continue;
+					}
+
+					// Vertical stacks are not centered since their section
+					// children will be
+					if( slide.classList.contains( 'stack' ) ) {
+						slide.style.top = 0;
+					}
+					else {
+						slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
+					}
 				}
 
-				// Vertical stacks are not centered since their section
-				// children will be
-				if( slide.classList.contains( 'stack' ) ) {
-					slide.style.top = 0;
-				}
-				else {
-					slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
-				}
 			}
 
 		}
diff --git a/js/reveal.min.js b/js/reveal.min.js
index eff798f..405a878 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.3 (2013-02-09, 19:08)
+ * reveal.js 2.3 (2013-02-11, 10:53)
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
  */
-var Reveal=function(){"use strict";function E(e){if(!d&&!p){document.body.setAttribute("class","no-transforms");return}window.addEventListener("load",H,!1),A(i,e),x(),T()}function S(){h.theme=document.querySelector("#theme"),h.wrapper=document.querySelector(".reveal"),h.slides=document.querySelector(".reveal .slides");if(!h.wrapper.querySelector(".progress")&&i.progress){var e=document.createElement("div");e.classList.add("progress"),e.innerHTML="<span></span>",h.wrapper.appendChild(e)}if(!h.wrapper.querySelector(".controls")&&i.controls){var t=document.createElement("aside");t.classList.add("controls"),t.innerHTML='<div class="navigate-left"></div><div class="navigate-right"></div><div class="navigate-up"></div><div class="navigate-down"></div>',h.wrapper.appendChild(t)}if(!h.wrapper.querySelector(".state-background")){var n=document.createElement("div");n.classList.add("state-background"),h.wrapper.appendChild(n)}if(!h.wrapper.querySelector(".pause-overlay")){var r=document.createElement("div");r.classList.add("pause-overlay"),h.wrapper.appendChild(r)}h.progress=document.querySelector(".reveal .progress"),h.progressbar=document.querySelector(".reveal .progress span"),i.controls&&(h.controls=document.querySelector(".reveal .controls"),h.controlsLeft=O(document.querySelectorAll(".navigate-left")),h.controlsRight=O(document.querySelectorAll(".navigate-right")),h.controlsUp=O(document.querySelectorAll(".navigate-up")),h.controlsDown=O(document.querySelectorAll(".navigate-down")),h.controlsPrev=O(document.querySelectorAll(".navigate-prev")),h.controlsNext=O(document.querySelectorAll(".navigate-next")))}function x(){/iphone|ipod|android/gi.test(navigator.userAgent)&&!/crios/gi.test(navigator.userAgent)&&(window.addEventListener("load",_,!1),window.addEventListener("orientationchange",_,!1))}function T(){function o(){t.length&&head.js.apply(null,t),N()}var e=[],t=[];for(var n=0,r=i.dependencies.length;n<r;n++){var s=i.dependencies[n];if(!s.condition||s.condition())s.async?t.push(s.src):e.push(s.src),typeof s.callback=="function"&&head.ready(s.src.match(/([\w\d_\-]*)\.?js$|[^\\\/]*$/i)[0],s.callback)}e.length?(head.ready(o),head.js.apply(null,e)):o()}function N(){S(),k(),C(),H(),Y(),rt(),setTimeout(function(){D("ready",{indexh:o,indexv:u,currentSlide:f})},1)}function C(){p===!1&&(i.transition="linear"),i.controls&&h.controls&&(h.controls.style.display="block"),i.progress&&h.progress&&(h.progress.style.display="block"),i.transition!=="default"&&h.wrapper.classList.add(i.transition),i.rtl&&h.wrapper.classList.add("rtl"),i.center&&h.wrapper.classList.add("center"),i.mouseWheel&&(document.addEventListener("DOMMouseScroll",vt,!1),document.addEventListener("mousewheel",vt,!1)),i.rollingLinks&&P();if(i.theme&&h.theme){var e=h.theme.getAttribute("href"),t=/[^\/]*?(?=\.css)/,n=e.match(t)[0];i.theme!==n&&(e=e.replace(t,i.theme),h.theme.setAttribute("href",e))}}function k(){window.addEventListener("hashchange",xt,!1),window.addEventListener("resize",Tt,!1),i.touch&&(document.addEventListener("touchstart",ht,!1),document.addEventListener("touchmove",pt,!1),document.addEventListener("touchend",dt,!1)),i.keyboard&&document.addEventListener("keydown",ct,!1),i.progress&&h.progress&&h.progress.addEventListener("click",mt,!1);if(i.controls&&h.controls){var e="ontouchstart"in window?"touchstart":"click";h.controlsLeft.forEach(function(t){t.addEventListener(e,gt,!1)}),h.controlsRight.forEach(function(t){t.addEventListener(e,yt,!1)}),h.controlsUp.forEach(function(t){t.addEventListener(e,bt,!1)}),h.controlsDown.forEach(function(t){t.addEventListener(e,wt,!1)}),h.controlsPrev.forEach(function(t){t.addEventListener(e,Et,!1)}),h.controlsNext.forEach(function(t){t.addEventListener(e,St,!1)})}}function L(){document.removeEventListener("keydown",ct,!1),window.removeEventListener("hashchange",xt,!1),window.removeEventListener("resize",Tt,!1),i.touch&&(document.removeEventListener("touchstart",ht,!1),document.removeEventListener("touchmove",pt,!1),document.removeEventListener("touchend",dt,!1)),i.progress&&h.progress&&h.progress.removeEventListener("click",mt,!1);if(i.controls&&h.controls){var e="ontouchstart"in window?"touchstart":"click";h.controlsLeft.forEach(function(t){t.removeEventListener(e,gt,!1)}),h.controlsRight.forEach(function(t){t.removeEventListener(e,yt,!1)}),h.controlsUp.forEach(function(t){t.removeEventListener(e,bt,!1)}),h.controlsDown.forEach(function(t){t.removeEventListener(e,wt,!1)}),h.controlsPrev.forEach(function(t){t.removeEventListener(e,Et,!1)}),h.controlsNext.forEach(function(t){t.removeEventListener(e,St,!1)})}}function A(e,t){for(var n in t)e[n]=t[n]}function O(e){return Array.prototype.slice.call(e)}function M(e,t){var n=e.x-t.x,r=e.y-t.y;return 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