diff --git a/css/main.css b/css/main.css
index 40806d3e..d2ab138c 100644
--- a/css/main.css
+++ b/css/main.css
@@ -364,7 +364,7 @@ a:not(.image) {
 		border-radius: 2px;
 	}
 
-img {
+section img {
 	margin: 30px 0 0 0;
 	background: rgba(255,255,255,0.12);
 	border: 4px solid #eee;
diff --git a/js/reveal.js b/js/reveal.js
index 6ce7a89e..335e6198 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -358,13 +358,20 @@ var Reveal = (function(){
 	 * @return {Boolean} true if there was a next fragment,
 	 * false otherwise
 	 */
-	function nextFragment() {
-		var fragments = document.querySelectorAll( '.present .fragment:not(.visible)' );
-
-		if( fragments.length ) {
-			fragments[0].classList.add( 'visible' );
-
-			return true;
+	function nextFragment() {	
+		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;
+			}
+		}
+		else {
+			var horizontalFragments = document.querySelectorAll( HORIZONTAL_SLIDES_SELECTOR + '.present .fragment:not(.visible)' );
+			if( horizontalFragments.length ) {
+				horizontalFragments[0].classList.add( 'visible' );
+				return true;
+			}
 		}
 
 		return false;
@@ -377,14 +384,21 @@ var Reveal = (function(){
 	 * false otherwise
 	 */
 	function previousFragment() {
-		var fragments = document.querySelectorAll( '.present .fragment.visible' );
-
-		if( fragments.length ) {
-			fragments[ fragments.length - 1 ].classList.remove( 'visible' );
-
-			return true;
+		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;
+			}
 		}
-
+		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;
 	}