diff --git a/gallery.php b/gallery.php
index 82e14e0e8..af723c1d4 100644
--- a/gallery.php
+++ b/gallery.php
@@ -87,10 +87,10 @@
 	<script type="text/javascript" src="resources/lang/<?php echo $config['language']; ?>.js"></script>
 	<script>
 		$(function() {
-			let reloadElement = $('<a>');
+			var reloadElement = $('<a>');
 			reloadElement.append('<i class="fa fa-refresh"></i>');
 			reloadElement.attr('href', '#');
-			reloadElement.on('click', () => photoBooth.reloadPage());
+			reloadElement.on('click', function() { photoBooth.reloadPage(); } );
 			reloadElement.appendTo('.gallery__header');
 
 			$('.gallery__close').hide();
diff --git a/resources/js/admin.js b/resources/js/admin.js
index 5ed49a618..af604c6c1 100644
--- a/resources/js/admin.js
+++ b/resources/js/admin.js
@@ -71,8 +71,8 @@ $(function() {
         $.ajax({
             url: '../api/checkVersion.php',
             method: 'GET',
-            success: (data) => {
-                let message = 'Error';
+            success: function(data) {
+                var message = 'Error';
                 $('#checkVersion').empty();
                 console.log('data', data)
                 if (!data.updateAvailable) {
diff --git a/resources/js/adminshortcut.js b/resources/js/adminshortcut.js
index 4d96a0ebd..5c21c6a78 100644
--- a/resources/js/adminshortcut.js
+++ b/resources/js/adminshortcut.js
@@ -1,5 +1,5 @@
 /* exported adminsettings */
-let admincount = 0;
+var admincount = 0;
 
 function countreset() {
     admincount = 0;
diff --git a/resources/js/chromakeying.js b/resources/js/chromakeying.js
index 696090195..874a4d03e 100644
--- a/resources/js/chromakeying.js
+++ b/resources/js/chromakeying.js
@@ -1,13 +1,13 @@
 /* globals MarvinColorModelConverter AlphaBoundary MarvinImage */
 /* exported setBackgroundImage */
-let mainImage;
-let mainImageWidth;
-let mainImageHeight;
-let backgroundImage;
+var mainImage;
+var mainImageWidth;
+var mainImageHeight;
+var backgroundImage;
 
 function greenToTransparency(imageIn, imageOut) {
-    for (let y = 0; y < imageIn.getHeight(); y++) {
-        for (let x = 0; x < imageIn.getWidth(); x++) {
+    for (var y = 0; y < imageIn.getHeight(); y++) {
+        for (var x = 0; x < imageIn.getWidth(); x++) {
 
             const color = imageIn.getIntColor(x, y);
             const hsv = MarvinColorModelConverter.rgbToHsv([color]);
@@ -22,8 +22,8 @@ function greenToTransparency(imageIn, imageOut) {
 }
 
 function reduceGreen(image) {
-    for (let y = 0; y < image.getHeight(); y++) {
-        for (let x = 0; x < image.getWidth(); x++) {
+    for (var y = 0; y < image.getHeight(); y++) {
+        for (var x = 0; x < image.getWidth(); x++) {
             const r = image.getIntComponent0(x, y);
             const g = image.getIntComponent1(x, y);
             const b = image.getIntComponent2(x, y);
@@ -43,8 +43,8 @@ function reduceGreen(image) {
 
 function alphaBoundary(imageOut, radius) {
     const ab = new AlphaBoundary();
-    for (let y = 0; y < imageOut.getHeight(); y++) {
-        for (let x = 0; x < imageOut.getWidth(); x++) {
+    for (var y = 0; y < imageOut.getHeight(); y++) {
+        for (var x = 0; x < imageOut.getWidth(); x++) {
             ab.alphaRadius(imageOut, x, y, radius);
         }
     }
@@ -164,12 +164,12 @@ function printImageHandler(ev) {
     $('#print_mesg').addClass('modal--show');
 
     setTimeout(function () {
-        saveImage((data) => {
+        saveImage(function(data) {
             if (!data.success) {
                 return;
             }
 
-            printImage(data.filename, () => {
+            printImage(data.filename, function() {
                 setTimeout(function () {
                     $('#print_mesg').removeClass('modal--show');
 
@@ -186,7 +186,7 @@ function saveImageHandler(ev) {
     $('#save_mesg').addClass('modal--show');
 
     setTimeout(function () {
-        saveImage(() => {
+        saveImage(function() {
             setTimeout(function () {
                 $('#save_mesg').removeClass('modal--show');
             }, 2000);
diff --git a/resources/js/core.js b/resources/js/core.js
index 5c0f3ee08..99c876974 100644
--- a/resources/js/core.js
+++ b/resources/js/core.js
@@ -17,7 +17,7 @@ const photoBooth = (function () {
             }
         };
 
-    let timeOut,
+    var timeOut,
         nextCollageNumber = 0,
         currentCollageFile = '',
         imgFilter = config.default_imagefilter;
@@ -137,7 +137,7 @@ const photoBooth = (function () {
         }
 
         loader.addClass('open');
-        public.startCountdown(nextCollageNumber ? config.collage_cntdwn_time : config.cntdwn_time, $('#counter'), () => {
+        public.startCountdown(nextCollageNumber ? config.collage_cntdwn_time : config.cntdwn_time, $('#counter'), function() {
             public.cheese(photoStyle);
         });
     }
@@ -156,7 +156,7 @@ const photoBooth = (function () {
             $('.loading').text(L10N.cheeseCollage);
         }
 
-        setTimeout(() => {
+        setTimeout(function() {
             public.takePic(photoStyle);
         }, config.cheese_time);
     }
@@ -195,11 +195,11 @@ const photoBooth = (function () {
                 $('<p>').text(`${result.current + 1} / ${result.limit}`).appendTo('.loading');
 
                 if (config.continuous_collage) {
-                    setTimeout(() => {
+                    setTimeout(function() {
                         public.thrill('collage');
                     }, 1000);
                 } else {
-                    $('<a class="btn" href="#">' + L10N.nextPhoto + '</a>').appendTo('.loading').click((ev) => {
+                    $('<a class="btn" href="#">' + L10N.nextPhoto + '</a>').appendTo('.loading').click(function(ev) {
                         ev.preventDefault();
 
                         public.thrill('collage');
@@ -239,7 +239,7 @@ const photoBooth = (function () {
 
         if (photoStyle === 'photo') {
             const preloadImage = new Image();
-            preloadImage.onload = () => {
+            preloadImage.onload = function() {
                 $('#loader').css('background-image', `url(${tempImageUrl})`);
                 $('#loader').addClass('showBackgroundImage');
             }
@@ -254,7 +254,7 @@ const photoBooth = (function () {
                 filter: imgFilter,
                 isCollage: photoStyle === 'collage',
             },
-            success: (data) => {
+            success: function(data) {
                 console.log('picture processed', data);
 
                 if (data.error) {
@@ -263,7 +263,7 @@ const photoBooth = (function () {
                     public.renderPic(data.file);
                 }
             },
-            error: (jqXHR, textStatus) => {
+            error: function(jqXHR, textStatus) {
                 console.log('An error occurred', textStatus);
 
                 public.errorPic({
@@ -291,15 +291,15 @@ const photoBooth = (function () {
             e.preventDefault();
             e.stopPropagation();
 
-            public.printImage(filename, () => {
+            public.printImage(filename, function() {
                 public.reloadPage();
             });
         });
 
-        resultPage.find('.deletebtn').off('click').on('click', (ev) => {
+        resultPage.find('.deletebtn').off('click').on('click', function(ev) {
             ev.preventDefault();
 
-            public.deleteImage(filename, (data) => {
+            public.deleteImage(filename, function(data) {
                 if (data.success) {
                     public.reloadPage();
                 } else {
@@ -314,7 +314,7 @@ const photoBooth = (function () {
         const imageUrl = config.folders.images + '/' + filename;
 
         const preloadImage = new Image();
-        preloadImage.onload = () => {
+        preloadImage.onload = function() {
             resultPage.css({
                 'background-image': `url(${imageUrl})`,
             });
@@ -340,10 +340,10 @@ const photoBooth = (function () {
     public.addImage = function (imageName) {
         const thumbImg = new Image();
         const bigImg = new Image();
-        let thumbSize = '';
-        let bigSize = '';
+        var thumbSize = '';
+        var bigSize = '';
 
-        let imgtoLoad = 2;
+        var imgtoLoad = 2;
 
         thumbImg.onload = function () {
             thumbSize = this.width + 'x' + this.height;
@@ -384,7 +384,7 @@ const photoBooth = (function () {
 
         gallery.addClass('gallery--open');
 
-        setTimeout(() => gallery.find('.gallery__inner').show(), 300);
+        setTimeout(function() { gallery.find('.gallery__inner').show();}, 300);
     }
 
     public.resetMailForm = function () {
@@ -394,8 +394,8 @@ const photoBooth = (function () {
 
     // Countdown Function
     public.startCountdown = function (start, element, cb) {
-        let count = 0;
-        let current = start;
+        var count = 0;
+        var current = start;
 
         function timerFunction() {
             element.text(current);
@@ -404,7 +404,7 @@ const photoBooth = (function () {
             element.removeClass('tick');
 
             if (count < start) {
-                window.setTimeout(() => element.addClass('tick'), 50);
+                window.setTimeout(function() { element.addClass('tick'); }, 50);
                 window.setTimeout(timerFunction, 1000);
             } else {
                 cb();
@@ -440,7 +440,7 @@ const photoBooth = (function () {
             data: {
                 file: imageName,
             },
-            success: (data) => {
+            success: function(data) {
                 cb(data);
             }
         });
diff --git a/resources/js/photoinit.js b/resources/js/photoinit.js
index 423288091..70e387312 100644
--- a/resources/js/photoinit.js
+++ b/resources/js/photoinit.js
@@ -2,7 +2,7 @@
 /* global photoBooth */
 function initPhotoSwipeFromDOM (gallerySelector) {
 
-    let gallery;
+    var gallery;
 
     const parseThumbnailElements = function (container) {
         return $(container).find('>a').map(function () {
@@ -67,20 +67,21 @@ function initPhotoSwipeFromDOM (gallerySelector) {
             shareEl: false,
             zoomEl: false,
             fullscreenEl: false,
+	    tapToToggleControls: false
         };
 
         // Pass data to PhotoSwipe and initialize it
         gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, options);
 
         // see: http://photoswipe.com/documentation/responsive-images.html
-        let realViewportWidth,
+        var realViewportWidth,
             useLargeImages = false,
             firstResize = true,
             imageSrcWillChange;
 
         gallery.listen('beforeResize', function () {
 
-            let dpiRatio = window.devicePixelRatio ? window.devicePixelRatio : 1;
+            var dpiRatio = window.devicePixelRatio ? window.devicePixelRatio : 1;
             dpiRatio = Math.min(dpiRatio, 2.5);
             realViewportWidth = gallery.viewportSize.x * dpiRatio;
 
@@ -154,7 +155,7 @@ function initPhotoSwipeFromDOM (gallerySelector) {
             pswpQR.removeClass('qr-active').fadeOut('fast');
         } else {
             pswpQR.empty();
-            let img = gallery.currItem.src;
+            var img = gallery.currItem.src;
             img = img.split('/').pop();
 
             $('<img>').attr('src', 'api/qrcode.php?filename=' + img).appendTo(pswpQR);
@@ -170,7 +171,7 @@ function initPhotoSwipeFromDOM (gallerySelector) {
 
         const img = gallery.currItem.src.split('/').pop();
 
-        photoBooth.printImage(img, () => {
+        photoBooth.printImage(img, function() {
             gallery.close();
         });
     });