diff --git a/src/js/plugin/destroy.js b/src/js/plugin/destroy.js
index a4d16d5..21dbc3d 100644
--- a/src/js/plugin/destroy.js
+++ b/src/js/plugin/destroy.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var d = require('../lib/dom')
-  , h = require('../lib/helper')
+  , _ = require('../lib/helper')
   , instances = require('./instances');
 
 module.exports = function (element) {
@@ -16,7 +16,7 @@ module.exports = function (element) {
   d.remove(i.scrollbarY);
   d.remove(i.scrollbarXRail);
   d.remove(i.scrollbarYRail);
-  h.removePsClasses(element);
+  _.removePsClasses(element);
 
   instances.remove(element);
 };
diff --git a/src/js/plugin/handler/click-rail.js b/src/js/plugin/handler/click-rail.js
index a32958f..9c14a52 100644
--- a/src/js/plugin/handler/click-rail.js
+++ b/src/js/plugin/handler/click-rail.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var h = require('../../lib/helper')
+var _ = require('../../lib/helper')
   , instances = require('../instances')
   , updateGeometry = require('../update-geometry')
   , updateScroll = require('../update-scroll');
@@ -15,7 +15,7 @@ function bindClickRailHandler(element, i) {
     i.event.bind(i.scrollbarY, 'click', stopPropagation);
   }
   i.event.bind(i.scrollbarYRail, 'click', function (e) {
-    var halfOfScrollbarLength = h.toInt(i.scrollbarYHeight / 2);
+    var halfOfScrollbarLength = _.toInt(i.scrollbarYHeight / 2);
     var positionTop = i.railYRatio * (e.pageY - window.pageYOffset - pageOffset(i.scrollbarYRail).top - halfOfScrollbarLength);
     var maxPositionTop = i.railYRatio * (i.railYHeight - i.scrollbarYHeight);
     var positionRatio = positionTop / maxPositionTop;
@@ -36,7 +36,7 @@ function bindClickRailHandler(element, i) {
     i.event.bind(i.scrollbarX, 'click', stopPropagation);
   }
   i.event.bind(i.scrollbarXRail, 'click', function (e) {
-    var halfOfScrollbarLength = h.toInt(i.scrollbarXWidth / 2);
+    var halfOfScrollbarLength = _.toInt(i.scrollbarXWidth / 2);
     var positionLeft = i.railXRatio * (e.pageX - window.pageXOffset - pageOffset(i.scrollbarXRail).left - halfOfScrollbarLength);
     var maxPositionLeft = i.railXRatio * (i.railXWidth - i.scrollbarXWidth);
     var positionRatio = positionLeft / maxPositionLeft;
diff --git a/src/js/plugin/handler/drag-scrollbar.js b/src/js/plugin/handler/drag-scrollbar.js
index 3cd250e..c15fd6c 100644
--- a/src/js/plugin/handler/drag-scrollbar.js
+++ b/src/js/plugin/handler/drag-scrollbar.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var d = require('../../lib/dom')
-  , h = require('../../lib/helper')
+  , _ = require('../../lib/helper')
   , instances = require('../instances')
   , updateGeometry = require('../update-geometry')
   , updateScroll = require('../update-scroll');
@@ -22,7 +22,7 @@ function bindMouseScrollXHandler(element, i) {
       i.scrollbarXLeft = newLeft;
     }
 
-    var scrollLeft = h.toInt(i.scrollbarXLeft * (i.contentWidth - i.containerWidth) / (i.containerWidth - (i.railXRatio * i.scrollbarXWidth))) - i.negativeScrollAdjustment;
+    var scrollLeft = _.toInt(i.scrollbarXLeft * (i.contentWidth - i.containerWidth) / (i.containerWidth - (i.railXRatio * i.scrollbarXWidth))) - i.negativeScrollAdjustment;
     updateScroll(element, 'left', scrollLeft);
   }
 
@@ -34,14 +34,14 @@ function bindMouseScrollXHandler(element, i) {
   };
 
   var mouseUpHandler = function () {
-    h.stopScrolling(element, 'x');
+    _.stopScrolling(element, 'x');
     i.event.unbind(i.ownerDocument, 'mousemove', mouseMoveHandler);
   };
 
   i.event.bind(i.scrollbarX, 'mousedown', function (e) {
     currentPageX = e.pageX;
-    currentLeft = h.toInt(d.css(i.scrollbarX, 'left')) * i.railXRatio;
-    h.startScrolling(element, 'x');
+    currentLeft = _.toInt(d.css(i.scrollbarX, 'left')) * i.railXRatio;
+    _.startScrolling(element, 'x');
 
     i.event.bind(i.ownerDocument, 'mousemove', mouseMoveHandler);
     i.event.once(i.ownerDocument, 'mouseup', mouseUpHandler);
@@ -67,7 +67,7 @@ function bindMouseScrollYHandler(element, i) {
       i.scrollbarYTop = newTop;
     }
 
-    var scrollTop = h.toInt(i.scrollbarYTop * (i.contentHeight - i.containerHeight) / (i.containerHeight - (i.railYRatio * i.scrollbarYHeight)));
+    var scrollTop = _.toInt(i.scrollbarYTop * (i.contentHeight - i.containerHeight) / (i.containerHeight - (i.railYRatio * i.scrollbarYHeight)));
     updateScroll(element, 'top', scrollTop);
   }
 
@@ -79,14 +79,14 @@ function bindMouseScrollYHandler(element, i) {
   };
 
   var mouseUpHandler = function () {
-    h.stopScrolling(element, 'y');
+    _.stopScrolling(element, 'y');
     i.event.unbind(i.ownerDocument, 'mousemove', mouseMoveHandler);
   };
 
   i.event.bind(i.scrollbarY, 'mousedown', function (e) {
     currentPageY = e.pageY;
-    currentTop = h.toInt(d.css(i.scrollbarY, 'top')) * i.railYRatio;
-    h.startScrolling(element, 'y');
+    currentTop = _.toInt(d.css(i.scrollbarY, 'top')) * i.railYRatio;
+    _.startScrolling(element, 'y');
 
     i.event.bind(i.ownerDocument, 'mousemove', mouseMoveHandler);
     i.event.once(i.ownerDocument, 'mouseup', mouseUpHandler);
diff --git a/src/js/plugin/handler/keyboard.js b/src/js/plugin/handler/keyboard.js
index e2bcea5..fa9719a 100644
--- a/src/js/plugin/handler/keyboard.js
+++ b/src/js/plugin/handler/keyboard.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var h = require('../../lib/helper')
+var _ = require('../../lib/helper')
   , d = require('../../lib/dom')
   , instances = require('../instances')
   , updateGeometry = require('../update-geometry')
@@ -57,7 +57,7 @@ function bindKeyboardHandler(element, i) {
       while (activeElement.shadowRoot) {
         activeElement = activeElement.shadowRoot.activeElement;
       }
-      if (h.isEditable(activeElement)) {
+      if (_.isEditable(activeElement)) {
         return;
       }
     }
diff --git a/src/js/plugin/handler/selection.js b/src/js/plugin/handler/selection.js
index b7c85b0..288fe51 100644
--- a/src/js/plugin/handler/selection.js
+++ b/src/js/plugin/handler/selection.js
@@ -1,6 +1,6 @@
 'use strict';
 
-var h = require('../../lib/helper')
+var _ = require('../../lib/helper')
   , instances = require('../instances')
   , updateGeometry = require('../update-geometry')
   , updateScroll = require('../update-scroll');
@@ -37,7 +37,7 @@ function bindSelectionHandler(element, i) {
       clearInterval(scrollingLoop);
       scrollingLoop = null;
     }
-    h.stopScrolling(element);
+    _.stopScrolling(element);
   }
 
   var isSelected = false;
@@ -68,10 +68,10 @@ function bindSelectionHandler(element, i) {
 
       if (mousePosition.x < containerGeometry.left + 3) {
         scrollDiff.left = -5;
-        h.startScrolling(element, 'x');
+        _.startScrolling(element, 'x');
       } else if (mousePosition.x > containerGeometry.right - 3) {
         scrollDiff.left = 5;
-        h.startScrolling(element, 'x');
+        _.startScrolling(element, 'x');
       } else {
         scrollDiff.left = 0;
       }
@@ -82,14 +82,14 @@ function bindSelectionHandler(element, i) {
         } else {
           scrollDiff.top = -20;
         }
-        h.startScrolling(element, 'y');
+        _.startScrolling(element, 'y');
       } else if (mousePosition.y > containerGeometry.bottom - 3) {
         if (mousePosition.y - containerGeometry.bottom + 3 < 5) {
           scrollDiff.top = 5;
         } else {
           scrollDiff.top = 20;
         }
-        h.startScrolling(element, 'y');
+        _.startScrolling(element, 'y');
       } else {
         scrollDiff.top = 0;
       }
diff --git a/src/js/plugin/handler/touch.js b/src/js/plugin/handler/touch.js
index 7477888..4f0e9ea 100644
--- a/src/js/plugin/handler/touch.js
+++ b/src/js/plugin/handler/touch.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var instances = require('../instances')
-  , h = require('../../lib/helper')
+  , _ = require('../../lib/helper')
   , updateGeometry = require('../update-geometry')
   , updateScroll = require('../update-scroll');
 
@@ -167,10 +167,10 @@ function bindTouchHandler(element, i, supportsTouch, supportsIePointer) {
 }
 
 module.exports = function (element) {
-  if (!h.env.supportsTouch && !h.env.supportsIePointer) {
+  if (!_.env.supportsTouch && !_.env.supportsIePointer) {
     return;
   }
 
   var i = instances.get(element);
-  bindTouchHandler(element, i, h.env.supportsTouch, h.env.supportsIePointer);
+  bindTouchHandler(element, i, _.env.supportsTouch, _.env.supportsIePointer);
 };
diff --git a/src/js/plugin/initialize.js b/src/js/plugin/initialize.js
index 24d3265..12f1e3e 100644
--- a/src/js/plugin/initialize.js
+++ b/src/js/plugin/initialize.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var cls = require('../lib/class')
-  , h = require('../lib/helper')
+  , _ = require('../lib/helper')
   , instances = require('./instances')
   , updateGeometry = require('./update-geometry');
 
@@ -24,7 +24,7 @@ module.exports = function (element, userSettings) {
   // Create a plugin instance.
   var i = instances.add(element);
 
-  i.settings = h.extend(i.settings, userSettings);
+  i.settings = _.extend(i.settings, userSettings);
   cls.add(element, 'ps-theme-' + i.settings.theme);
 
   i.settings.handlers.forEach(function (handlerName) {
diff --git a/src/js/plugin/instances.js b/src/js/plugin/instances.js
index 851c590..e10bcc6 100644
--- a/src/js/plugin/instances.js
+++ b/src/js/plugin/instances.js
@@ -5,14 +5,14 @@ var cls = require('../lib/class')
   , defaultSettings = require('./default-setting')
   , EventManager = require('../lib/event-manager')
   , guid = require('../lib/guid')
-  , h = require('../lib/helper');
+  , _ = require('../lib/helper');
 
 var instances = {};
 
 function Instance(element) {
   var i = this;
 
-  i.settings = h.clone(defaultSettings);
+  i.settings = _.clone(defaultSettings);
   i.containerWidth = null;
   i.containerHeight = null;
   i.contentWidth = null;
@@ -47,13 +47,13 @@ function Instance(element) {
   i.scrollbarXActive = null;
   i.scrollbarXWidth = null;
   i.scrollbarXLeft = null;
-  i.scrollbarXBottom = h.toInt(d.css(i.scrollbarXRail, 'bottom'));
+  i.scrollbarXBottom = _.toInt(d.css(i.scrollbarXRail, 'bottom'));
   i.isScrollbarXUsingBottom = i.scrollbarXBottom === i.scrollbarXBottom; // !isNaN
-  i.scrollbarXTop = i.isScrollbarXUsingBottom ? null : h.toInt(d.css(i.scrollbarXRail, 'top'));
-  i.railBorderXWidth = h.toInt(d.css(i.scrollbarXRail, 'borderLeftWidth')) + h.toInt(d.css(i.scrollbarXRail, 'borderRightWidth'));
+  i.scrollbarXTop = i.isScrollbarXUsingBottom ? null : _.toInt(d.css(i.scrollbarXRail, 'top'));
+  i.railBorderXWidth = _.toInt(d.css(i.scrollbarXRail, 'borderLeftWidth')) + _.toInt(d.css(i.scrollbarXRail, 'borderRightWidth'));
   // Set rail to display:block to calculate margins
   d.css(i.scrollbarXRail, 'display', 'block');
-  i.railXMarginWidth = h.toInt(d.css(i.scrollbarXRail, 'marginLeft')) + h.toInt(d.css(i.scrollbarXRail, 'marginRight'));
+  i.railXMarginWidth = _.toInt(d.css(i.scrollbarXRail, 'marginLeft')) + _.toInt(d.css(i.scrollbarXRail, 'marginRight'));
   d.css(i.scrollbarXRail, 'display', '');
   i.railXWidth = null;
   i.railXRatio = null;
@@ -66,13 +66,13 @@ function Instance(element) {
   i.scrollbarYActive = null;
   i.scrollbarYHeight = null;
   i.scrollbarYTop = null;
-  i.scrollbarYRight = h.toInt(d.css(i.scrollbarYRail, 'right'));
+  i.scrollbarYRight = _.toInt(d.css(i.scrollbarYRail, 'right'));
   i.isScrollbarYUsingRight = i.scrollbarYRight === i.scrollbarYRight; // !isNaN
-  i.scrollbarYLeft = i.isScrollbarYUsingRight ? null : h.toInt(d.css(i.scrollbarYRail, 'left'));
-  i.scrollbarYOuterWidth = i.isRtl ? h.outerWidth(i.scrollbarY) : null;
-  i.railBorderYWidth = h.toInt(d.css(i.scrollbarYRail, 'borderTopWidth')) + h.toInt(d.css(i.scrollbarYRail, 'borderBottomWidth'));
+  i.scrollbarYLeft = i.isScrollbarYUsingRight ? null : _.toInt(d.css(i.scrollbarYRail, 'left'));
+  i.scrollbarYOuterWidth = i.isRtl ? _.outerWidth(i.scrollbarY) : null;
+  i.railBorderYWidth = _.toInt(d.css(i.scrollbarYRail, 'borderTopWidth')) + _.toInt(d.css(i.scrollbarYRail, 'borderBottomWidth'));
   d.css(i.scrollbarYRail, 'display', 'block');
-  i.railYMarginHeight = h.toInt(d.css(i.scrollbarYRail, 'marginTop')) + h.toInt(d.css(i.scrollbarYRail, 'marginBottom'));
+  i.railYMarginHeight = _.toInt(d.css(i.scrollbarYRail, 'marginTop')) + _.toInt(d.css(i.scrollbarYRail, 'marginBottom'));
   d.css(i.scrollbarYRail, 'display', '');
   i.railYHeight = null;
   i.railYRatio = null;
diff --git a/src/js/plugin/update-geometry.js b/src/js/plugin/update-geometry.js
index b275cab..31a2cf6 100644
--- a/src/js/plugin/update-geometry.js
+++ b/src/js/plugin/update-geometry.js
@@ -2,7 +2,7 @@
 
 var cls = require('../lib/class')
   , d = require('../lib/dom')
-  , h = require('../lib/helper')
+  , _ = require('../lib/helper')
   , instances = require('./instances')
   , updateScroll = require('./update-scroll');
 
@@ -82,8 +82,8 @@ module.exports = function (element) {
     i.scrollbarXActive = true;
     i.railXWidth = i.containerWidth - i.railXMarginWidth;
     i.railXRatio = i.containerWidth / i.railXWidth;
-    i.scrollbarXWidth = getThumbSize(i, h.toInt(i.railXWidth * i.containerWidth / i.contentWidth));
-    i.scrollbarXLeft = h.toInt((i.negativeScrollAdjustment + element.scrollLeft) * (i.railXWidth - i.scrollbarXWidth) / (i.contentWidth - i.containerWidth));
+    i.scrollbarXWidth = getThumbSize(i, _.toInt(i.railXWidth * i.containerWidth / i.contentWidth));
+    i.scrollbarXLeft = _.toInt((i.negativeScrollAdjustment + element.scrollLeft) * (i.railXWidth - i.scrollbarXWidth) / (i.contentWidth - i.containerWidth));
   } else {
     i.scrollbarXActive = false;
   }
@@ -92,8 +92,8 @@ module.exports = function (element) {
     i.scrollbarYActive = true;
     i.railYHeight = i.containerHeight - i.railYMarginHeight;
     i.railYRatio = i.containerHeight / i.railYHeight;
-    i.scrollbarYHeight = getThumbSize(i, h.toInt(i.railYHeight * i.containerHeight / i.contentHeight));
-    i.scrollbarYTop = h.toInt(element.scrollTop * (i.railYHeight - i.scrollbarYHeight) / (i.contentHeight - i.containerHeight));
+    i.scrollbarYHeight = getThumbSize(i, _.toInt(i.railYHeight * i.containerHeight / i.contentHeight));
+    i.scrollbarYTop = _.toInt(element.scrollTop * (i.railYHeight - i.scrollbarYHeight) / (i.contentHeight - i.containerHeight));
   } else {
     i.scrollbarYActive = false;
   }
diff --git a/src/js/plugin/update.js b/src/js/plugin/update.js
index 182c856..c758934 100644
--- a/src/js/plugin/update.js
+++ b/src/js/plugin/update.js
@@ -1,7 +1,7 @@
 'use strict';
 
 var d = require('../lib/dom')
-  , h = require('../lib/helper')
+  , _ = require('../lib/helper')
   , instances = require('./instances')
   , updateGeometry = require('./update-geometry')
   , updateScroll = require('./update-scroll');
@@ -19,8 +19,8 @@ module.exports = function (element) {
   // Recalculate rail margins
   d.css(i.scrollbarXRail, 'display', 'block');
   d.css(i.scrollbarYRail, 'display', 'block');
-  i.railXMarginWidth = h.toInt(d.css(i.scrollbarXRail, 'marginLeft')) + h.toInt(d.css(i.scrollbarXRail, 'marginRight'));
-  i.railYMarginHeight = h.toInt(d.css(i.scrollbarYRail, 'marginTop')) + h.toInt(d.css(i.scrollbarYRail, 'marginBottom'));
+  i.railXMarginWidth = _.toInt(d.css(i.scrollbarXRail, 'marginLeft')) + _.toInt(d.css(i.scrollbarXRail, 'marginRight'));
+  i.railYMarginHeight = _.toInt(d.css(i.scrollbarYRail, 'marginTop')) + _.toInt(d.css(i.scrollbarYRail, 'marginBottom'));
 
   // Hide scrollbars not to affect scrollWidth and scrollHeight
   d.css(i.scrollbarXRail, 'display', 'none');