diff --git a/js/reveal.js b/js/reveal.js
index 600a7634..e6368d6d 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -615,15 +615,20 @@ var Reveal = (function(){
 
 		if( config.focusBodyOnPageVisiblityChange ) {
 			var visibilityChange;
-			if ('hidden' in document) {
+
+			if( 'hidden' in document ) {
 				visibilityChange = 'visibilitychange';
-			} else if ('msHidden' in document) {
+			}
+			else if( 'msHidden' in document ) {
 				visibilityChange = 'msvisibilitychange';
-			} else if ('webkitHidden' in document) {
+			}
+			else if( 'webkitHidden' in document ) {
 				visibilityChange = 'webkitvisibilitychange';
 			}
 
-			document.addEventListener(visibilityChange, onPageVisibilityChange, false);
+			if( visibilityChange ) {
+				document.addEventListener( visibilityChange, onPageVisibilityChange, false );
+			}
 		}
 
 		[ 'touchstart', 'click' ].forEach( function( eventName ) {
diff --git a/js/reveal.min.js b/js/reveal.min.js
index 2463ef9f..b400f6d3 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,8 +1,8 @@
 /*!
- * reveal.js 2.6.0-dev (2013-09-21, 22:18)
+ * reveal.js 2.6.0-dev (2013-10-10, 09:19)
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2013 Hakim El Hattab, http://hakim.se
  */
-var Reveal=function(){"use strict";function a(a){return b(),Mb||Lb?(window.addEventListener("load",C,!1),l(Sb,a),s(),c(),void 0):(document.body.setAttribute("class","no-transforms"),void 0)}function b(){Lb="WebkitPerspective"in document.body.style||"MozPerspective"in document.body.style||"msPerspective"in document.body.style||"OPerspective"in document.body.style||"perspective"in document.body.style,Mb="WebkitTransform"in document.body.style||"MozTransform"in document.body.style||"msTransform"in document.body.style||"OTransform"in document.body.style||"transform"in document.body.style,Nb=navigator.userAgent.match(/(iphone|ipod|android)/gi)}function c(){function a(){c.length&&head.js.apply(null,c),d()}for(var b=[],c=[],e=0,f=Sb.dependencies.length;f>e;e++){var g=Sb.dependencies[e];(!g.condition||g.condition())&&(g.async?c.push(g.src):b.push(g.src),"function"==typeof g.callback&&head.ready(g.src.match(/([\w\d_\-]*)\.?js$|[^\\\/]*$/i)[0],g.callback))}b.length?(head.ready(a),head.js.apply(null,b)):a()}function d(){f(),e(),i(),ab(),setTimeout(function(){Xb.slides.classList.remove("no-transition"),Tb=!0,u("ready",{indexh:Hb,indexv:Ib,currentSlide:Kb})},1)}function e(){var a=m(document.querySelectorAll(Pb));a.forEach(function(a){var b=m(a.querySelectorAll("section"));b.forEach(function(a,b){b>0&&a.classList.add("future")})})}function f(){Xb.theme=document.querySelector("#theme"),Xb.wrapper=document.querySelector(".reveal"),Xb.slides=document.querySelector(".reveal .slides"),Xb.slides.classList.add("no-transition"),Xb.background=g(Xb.wrapper,"div","backgrounds",null),Xb.progress=g(Xb.wrapper,"div","progress","<span></span>"),Xb.progressbar=Xb.progress.querySelector("span"),g(Xb.wrapper,"aside","controls",'<div class="navigate-left"></div><div class="navigate-right"></div><div class="navigate-up"></div><div 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c={background:a.getAttribute("data-background"),backgroundSize:a.getAttribute("data-background-size"),backgroundImage:a.getAttribute("data-background-image"),backgroundColor:a.getAttribute("data-background-color"),backgroundRepeat:a.getAttribute("data-background-repeat"),backgroundPosition:a.getAttribute("data-background-position"),backgroundTransition:a.getAttribute("data-background-transition")},d=document.createElement("div");return 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