diff --git a/slideshow.js b/slideshow.js
index f083c25..c0fafc4 100755
--- a/slideshow.js
+++ b/slideshow.js
@@ -96,7 +96,7 @@ var self = window.SlideShow = function(slide) {
                 body.removeEventListener('click', arguments.callee);
             }, false);
         }
-    }
+    };
 
 	// Order of the slides
 	this.order = [];
@@ -152,6 +152,11 @@ var self = window.SlideShow = function(slide) {
 	document.addEventListener('keyup', this, false);
 	document.addEventListener('keydown', this, false);
 
+	document.addEventListener('touchstart', this, false);
+	document.addEventListener('touchmove', this, false);
+	document.addEventListener('touchend', this, false);
+	document.addEventListener('touchcancel', this, false);
+
 	// Process iframe slides
 	$$('.slide[data-src]:empty').forEach(function(slide) {
 		var iframe = document.createElement('iframe');
@@ -186,16 +191,20 @@ var self = window.SlideShow = function(slide) {
 			b.className = 'onscreen-nav next';
 			b.textContent = 'Next ▶';
 			b.type = 'button';
-			b.onclick = function() { me.next(); }
+			b.onclick = function() { me.next(); };
 
 			slide.appendChild(b);
 		}
 	});
 };
 
+var horizontalDistanceThreshold = 20,  // Swipe horizontal displacement must be more than this.
+    verticalDistanceThreshold   = 80,  // Swipe vertical displacement must be less than this.
+		startTouch,
+		stopTouch;
+
 self.prototype = {
 	handleEvent: function(evt) {
-		var me = this;
 
 		// Prevent script from hijacking the user’s navigation
 		if (evt.metaKey && evt.keyCode) {
@@ -215,10 +224,10 @@ self.prototype = {
 					switch(evt.keyCode) {
 						case 71: // G
 							var slide = prompt('Which slide?');
-							me.goto(+slide? slide - 1 : slide);
+							this.goto(+slide? slide - 1 : slide);
 							break;
 						case 72: // H
-						    me.overview(evt);
+							this.overview(evt);
 							break;
 						case 74: // J
 							if(body.classList.contains('hide-elements')) {
@@ -281,6 +290,29 @@ self.prototype = {
 					}
 				}
 				break;
+			case 'touchstart':
+				evt.preventDefault();  // prevent image drag
+				data = evt.touches ? evt.touches[0] : evt;
+				startTouch = { X: data.pageX, Y: data.pageY };
+				break;
+			case 'touchmove':
+				data = evt.touches ? evt.touches[0] : evt;
+				stopTouch = { X: data.pageX, Y: data.pageY };
+				break;
+			case 'touchend':
+				if (!startTouch || !stopTouch) break;
+				if (Math.abs(startTouch.X - stopTouch.X) < horizontalDistanceThreshold) break;
+				if (Math.abs(startTouch.Y - stopTouch.Y) > verticalDistanceThreshold) break;
+				if (startTouch.X > stopTouch.X) {
+					this.previous();
+				} else {
+					this.next();
+				}
+				startTouch = stopTouch = null;
+				break;
+			case 'touchcancel':
+				startTouch = stopTouch = null;
+				break;
 			case 'load':
 			case 'resize':
 				this.adjustFontSize();
@@ -379,12 +411,10 @@ self.prototype = {
 		// our current item (and there's no point either, so we save on performance)
 		window.removeEventListener('hashchange', this, false);
 
-		var id;
-
 		if(which + 0 === which && which in this.slides) {
 			// Argument is a valid slide number
 			this.index = which;
-			this.slide = this.order[which]
+			this.slide = this.order[which];
 
 			slide = this.slides[this.slide];
 
@@ -418,7 +448,7 @@ self.prototype = {
 			// Update items collection
 			this.items = $$('.delayed, .delayed-children > *', this.slides[this.slide]);
 			this.items.sort(function(a, b){
-				return (a.getAttribute('data-index') || 0) - (b.getAttribute('data-index') || 0)
+				return (a.getAttribute('data-index') || 0) - (b.getAttribute('data-index') || 0);
 			});
 			this.item = 0;
 
@@ -547,7 +577,7 @@ self.getSlide = function(element) {
 	}
 
 	return slide;
-}
+};
 
 })(document.head || document.getElementsByTagName('head')[0], document.body, document.documentElement);
 
@@ -559,7 +589,7 @@ addEventListener('load', function(){ // no idea why the timeout is needed
 
 		for(var j=rulez.length; j--;) {
 			var selector = rulez[j].selectorText.replace(/^|,/g, function($0) {
-				return '#' + parentid + ' ' + $0
+				return '#' + parentid + ' ' + $0;
 			});
 
 			var cssText = rulez[j].cssText.replace(/^.+?{/, selector + '{');