diff --git a/index.html b/index.html
index 195f552..6254db3 100644
--- a/index.html
+++ b/index.html
@@ -8,7 +8,7 @@
 <script type="text/javascript" src="js/player.js?2"></script>
 <script type="text/javascript" src="js/staticfuncs.js?2"></script>
 <script type="text/javascript" src="js/classes.js?2"></script>
-<script type="text/javascript" src="js/app.js?2"></script>
+<script type="text/javascript" src="js/app.js?3"></script>
 <script type="text/javascript" src="js/ox.extra.js"></script>
 <script type="text/javascript" src="js/dnd.js"></script>
 <script type="text/javascript" src="js/error.js?2"></script>
@@ -112,10 +112,10 @@ A web based transcribing and subtitling tool. It is used for transcribing videos
     <div id="filepath"></div>
     <div id="timeCode">0:00:00.000</div>
     <div id="helpWrapper">
-      <b>Ctrl</b> / <b>Alt</b>: Seek back / forward &nbsp;<input id="seekTime" value="1" /> &nbsp;seconds.<br />
+      <b id="seek_back">Ctrl</b> / <b id="seek_fwd">Alt</b>: Seek back / forward &nbsp;<input id="seekTime" value="1" /> &nbsp;seconds.<br />
       <b>Esc</b>: Pause / Unpause <br />
       <b>Insert / Tab</b>: Insert time-code<br />
-      <b>PageUp</b> / <b>PageDown</b>: Volume Up / Down<br />
+      <b>Shift PageUp</b> / <b>Shift PageDown</b>: Volume Up / Down<br />
       <b>Double-click on time-code in textarea</b>: Seek video to time-code. <br />
     </div>
 
diff --git a/js/app.js b/js/app.js
index 105bf92..a1b7d9f 100644
--- a/js/app.js
+++ b/js/app.js
@@ -10,6 +10,11 @@ var videoHash = undefined;
 Ox.load({
     UI: {theme: 'oxlight'},
 }, function() {
+    if (navigator.platform == 'MacIntel') {
+    } else {
+        $('#seek_back').html('PageUp')
+        $('#seek_fwd').html('PageDown')
+    }
     Ox.$body.show();
     globalUser = new User();
     adjustSize();
@@ -40,19 +45,25 @@ Ox.load({
                 return false;
             }
         }
-        //Ctrl - Seek Back
-        if (e.keyCode == 17) {
-            var seekTime = parseFloat($('#seekTime').val());
-            var currTime = Video.get();
-            var newTime = currTime - seekTime;
-            Video.set(newTime);
-        }
-        //Alt - Seek Fwd.
-        if (e.keyCode == 18) {
-            var seekTime = parseFloat($('#seekTime').val());
-            var currTime = Video.get();
-            var newTime = currTime + seekTime;
-            Video.set(newTime);
+        if (navigator.platform == 'MacIntel') {
+            //Ctrl - Seek Back
+            if (e.keyCode == 17) {
+                seek(-seekTime)
+            }
+            //Alt - Seek Fwd.
+            if (e.keyCode == 18) {
+                seek(seekTime)
+            }
+        } else {
+            //PageUp - seek back
+            if (e.keyCode == 33) {
+                seek(-seekTime)
+            }
+
+            // PageDown - seek fwd.
+            if (e.keyCode == 34) {
+                seek(seekTime)
+            }
         }
 
         //Space - togglePause if no focus on TA
@@ -60,13 +71,14 @@ Ox.load({
             Video.togglePause();
         }
 
-        //PageUp - volume Up:
-        if (e.keyCode == 33) {
+        //Shift PageUp - volume up:
+        if (e.keyCode == 33 && e.shiftKey) {
             Video.volUp();
             return false;
         }
 
-        if (e.keyCode == 34) {
+        //Shift PageDown - volume down:
+        if (e.keyCode == 34 && e.shiftKey) {
             Video.volDown();
             return false;
         }
@@ -318,6 +330,13 @@ function loadVideo(videoFile) {
     });
 };
 
+function seek(delta) {
+    var seekTime = parseFloat($('#seekTime').val());
+    var currTime = Video.get();
+    var newTime = currTime + delta;
+    Video.set(newTime);
+}
+
 $(window).unload(function() {
     saveTxt();
 });