diff --git a/external/jquery.mousewheel.js b/external/jquery.mousewheel.js
index bf766be6d..8c603041b 100644
--- a/external/jquery.mousewheel.js
+++ b/external/jquery.mousewheel.js
@@ -1,84 +1,101 @@
-/*! Copyright (c) 2011 Brandon Aaron (http://brandonaaron.net)
+/*! Copyright (c) 2013 Brandon Aaron (http://brandonaaron.net)
  * Licensed under the MIT License (LICENSE.txt).
  *
  * Thanks to: http://adomas.org/javascript-mouse-wheel/ for some pointers.
  * Thanks to: Mathias Bank(http://www.mathias-bank.de) for a scope bug fix.
  * Thanks to: Seamus Leahy for adding deltaX and deltaY
  *
- * Version: 3.0.6
+ * Version: 3.1.0
  *
  * Requires: 1.2.2+
  */
 
-(function($) {
-
-var types = ['DOMMouseScroll', 'mousewheel'];
-
-if ($.event.fixHooks) {
-    for ( var i=types.length; i; ) {
-        $.event.fixHooks[ types[--i] ] = $.event.mouseHooks;
+(function (factory) {
+    if (typeof define === 'function' && define.amd) {
+        // AMD. Register as an anonymous module.
+        define(['jquery'], factory);
+    } else {
+        // Browser globals
+        factory(jQuery);
     }
-}
+}(function ($) {
 
-$.event.special.mousewheel = {
-    setup: function() {
-        if ( this.addEventListener ) {
-            for ( var i=types.length; i; ) {
-                this.addEventListener( types[--i], handler, false );
-            }
-        } else {
-            this.onmousewheel = handler;
-        }
-    },
+    var toFix = ['wheel', 'mousewheel', 'DOMMouseScroll'];
+    var toBind = 'onwheel' in document || document.documentMode >= 9 ? ['wheel'] : ['mousewheel', 'DomMouseScroll', 'MozMousePixelScroll'];
+    var lowestDelta, lowestDeltaXY;
 
-    teardown: function() {
-        if ( this.removeEventListener ) {
-            for ( var i=types.length; i; ) {
-                this.removeEventListener( types[--i], handler, false );
-            }
-        } else {
-            this.onmousewheel = null;
+    if ($.event.fixHooks) {
+        for ( var i=toFix.length; i; ) {
+            $.event.fixHooks[ toFix[--i] ] = $.event.mouseHooks;
         }
     }
-};
 
-$.fn.extend({
-    mousewheel: function(fn) {
-        return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
-    },
+    $.event.special.mousewheel = {
+        setup: function() {
+            if ( this.addEventListener ) {
+                for ( var i=toBind.length; i; ) {
+                    this.addEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = handler;
+            }
+        },
 
-    unmousewheel: function(fn) {
-        return this.unbind("mousewheel", fn);
-    }
-});
+        teardown: function() {
+            if ( this.removeEventListener ) {
+                for ( var i=toBind.length; i; ) {
+                    this.removeEventListener( toBind[--i], handler, false );
+                }
+            } else {
+                this.onmousewheel = null;
+            }
+        }
+    };
+
+    $.fn.extend({
+        mousewheel: function(fn) {
+            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
+        },
+
+        unmousewheel: function(fn) {
+            return this.unbind("mousewheel", fn);
+        }
+    });
 
 
-function handler(event) {
-    var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, returnValue = true, deltaX = 0, deltaY = 0;
-    event = $.event.fix(orgEvent);
-    event.type = "mousewheel";
+    function handler(event) {
+        var orgEvent = event || window.event, args = [].slice.call( arguments, 1 ), delta = 0, deltaX = 0, deltaY = 0, absDelta = 0, absDeltaXY = 0;
+        event = $.event.fix(orgEvent);
+        event.type = "mousewheel";
 
-    // Old school scrollwheel delta
-    if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta/120; }
-    if ( orgEvent.detail     ) { delta = -orgEvent.detail/3; }
+        // Old school scrollwheel delta
+        if ( orgEvent.wheelDelta ) { delta = orgEvent.wheelDelta;  }
+        if ( orgEvent.detail     ) { delta = orgEvent.detail * -1; }
 
-    // New school multidimensional scroll (touchpads) deltas
-    deltaY = delta;
+        // New school wheel delta (wheel event)
+        if ( orgEvent.deltaY ) {
+            deltaY = orgEvent.deltaY * -1;
+            delta  = deltaY;
+        }
+        if ( orgEvent.deltaX ) {
+            deltaX = orgEvent.deltaX;
+            delta  = deltaX * -1;
+        }
 
-    // Gecko
-    if ( orgEvent.axis !== undefined && orgEvent.axis === orgEvent.HORIZONTAL_AXIS ) {
-        deltaY = 0;
-        deltaX = -1*delta;
+        // Webkit
+        if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY;      }
+        if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = orgEvent.wheelDeltaX * -1; }
+
+        absDelta = Math.abs(delta);
+        if ( !lowestDelta || absDelta < lowestDelta ) { lowestDelta = absDelta; }
+
+        absDeltaXY = Math.max( Math.abs(deltaY), Math.abs(deltaX) );
+        if ( !lowestDeltaXY || absDeltaXY < lowestDeltaXY ) { lowestDeltaXY = absDeltaXY; }
+
+        // Add event and delta to the front of the arguments
+        args.unshift(event, Math.floor(delta/lowestDelta), Math.floor(deltaX/lowestDeltaXY), Math.floor(deltaY/lowestDeltaXY));
+
+        return ($.event.dispatch || $.event.handle).apply(this, args);
     }
 
-    // Webkit
-    if ( orgEvent.wheelDeltaY !== undefined ) { deltaY = orgEvent.wheelDeltaY/120; }
-    if ( orgEvent.wheelDeltaX !== undefined ) { deltaX = -1*orgEvent.wheelDeltaX/120; }
-
-    // Add event and delta to the front of the arguments
-    args.unshift(event, delta, deltaX, deltaY);
-
-    return ($.event.dispatch || $.event.handle).apply(this, args);
-}
-
-})(jQuery);
\ No newline at end of file
+}));