text: //
  // SmoothScroll for websites v1.2.1
  // Licensed under the terms of the MIT license.
  //
  // You may use it in your theme if you credit me. 
  // It is also free to use on any individual website.
  //
  // Exception:
  // The only restriction would be not to publish any  
  // extension for browsers or native application
  // without getting a permission first.
  //
  
  // People involved
  //  - Balazs Galambosi (maintainer)   
  //  - Michael Herf     (Pulse Algorithm)
  
  (function(){
    
  // Scroll Variables (tweakable)
  var defaultOptions = {
  
      // Scrolling Core
      frameRate        : 100, // [Hz]
      animationTime    : 1000, // [px]
      stepSize         : 100, // [px]
  
      // Pulse (less tweakable)
      // ratio of "tail" to "acceleration"
      pulseAlgorithm   : true,
      pulseScale       : 8,
      pulseNormalize   : 1,
  
      // Acceleration
      accelerationDelta : 20,  // 20
      accelerationMax   : 1,   // 1
  
      // Keyboard Settings
      keyboardSupport   : true,  // option
      arrowScroll       : 50,     // [px]
  
      // Other
      touchpadSupport   : true,
      fixedBackground   : true, 
      excluded          : ""    
  };
  
  var options = defaultOptions;
  
  
  // Other Variables
  var isExcluded = false;
  var isFrame = false;
  var direction = { x: 0, y: 0 };
  var initDone  = false;
  var root = document.documentElement;
  var activeElement;
  var observer;
  var deltaBuffer = [ 120, 120, 120 ];
  
  var key = { left: 37, up: 38, right: 39, down: 40, spacebar: 32, 
              pageup: 33, pagedown: 34, end: 35, home: 36 };
  
  
  /***********************************************
   * SETTINGS
   ***********************************************/
  
  var options = defaultOptions;
  
  
  /***********************************************
   * INITIALIZE
   ***********************************************/
  
  /**
   * Tests if smooth scrolling is allowed. Shuts down everything if not.
   */
  function initTest() {
  
      var disableKeyboard = false; 
      
      // disable keyboard support if anything above requested it
      if (disableKeyboard) {
          removeEvent("keydown", keydown);
      }
  
      if (options.keyboardSupport && !disableKeyboard) {
          addEvent("keydown", keydown);
      }
  }
  
  /**
   * Sets up scrolls array, determines if frames are involved.
   */
  function init() {
    
      if (!document.body) return;
  
      var body = document.body;
      var html = document.documentElement;
      var windowHeight = window.innerHeight; 
      var scrollHeight = body.scrollHeight;
      
      // check compat mode for root element
      root = (document.compatMode.indexOf('CSS') >= 0) ? html : body;
      activeElement = body;
      
      initTest();
      initDone = true;
  
      // Checks if this script is running in a frame
      if (top != self) {
          isFrame = true;
      }
  
      /**
       * This fixes a bug where the areas left and right to 
       * the content does not trigger the onmousewheel event
       * on some pages. e.g.: html, body { height: 100% }
       */
      else if (scrollHeight > windowHeight &&
              (body.offsetHeight <= windowHeight || 
               html.offsetHeight <= windowHeight)) {
  
          // DOMChange (throttle): fix height
          var pending = false;
          var refresh = function () {
              if (!pending && html.scrollHeight != document.height) {
                  pending = true; // add a new pending action
                  setTimeout(function () {
                      html.style.height = document.height + 'px';
                      pending = false;
                  }, 500); // act rarely to stay fast
              }
          };
          html.style.height = 'auto';
          setTimeout(refresh, 10);
  
          // clearfix
          if (root.offsetHeight <= windowHeight) {
              var underlay = document.createElement("div"); 	
              underlay.style.clear = "both";
              body.appendChild(underlay);
          }
      }
  
      // disable fixed background
      if (!options.fixedBackground && !isExcluded) {
          body.style.backgroundAttachment = "scroll";
          html.style.backgroundAttachment = "scroll";
      }
  }
  
  
  /************************************************
   * SCROLLING 
   ************************************************/
   
  var que = [];
  var pending = false;
  var lastScroll = +new Date;
  
  /**
   * Pushes scroll actions to the scrolling queue.
   */
  function scrollArray(elem, left, top, delay) {
      
      delay || (delay = 1000);
      directionCheck(left, top);
  
      if (options.accelerationMax != 1) {
          var now = +new Date;
          var elapsed = now - lastScroll;
          if (elapsed < options.accelerationDelta) {
              var factor = (1 + (30 / elapsed)) / 2;
              if (factor > 1) {
                  factor = Math.min(factor, options.accelerationMax);
                  left *= factor;
                  top  *= factor;
              }
          }
          lastScroll = +new Date;
      }          
      
      // push a scroll command
      que.push({
          x: left, 
          y: top, 
          lastX: (left < 0) ? 0.99 : -0.99,
          lastY: (top  < 0) ? 0.99 : -0.99, 
          start: +new Date
      });
          
      // don't act if there's a pending queue
      if (pending) {
          return;
      }  
  
      var scrollWindow = (elem === document.body);
      
      var step = function (time) {
          
          var now = +new Date;
          var scrollX = 0;
          var scrollY = 0; 
      
          for (var i = 0; i < que.length; i++) {
              
              var item = que[i];
              var elapsed  = now - item.start;
              var finished = (elapsed >= options.animationTime);
              
              // scroll position: [0, 1]
              var position = (finished) ? 1 : elapsed / options.animationTime;
              
              // easing [optional]
              if (options.pulseAlgorithm) {
                  position = pulse(position);
              }
              
              // only need the difference
              var x = (item.x * position - item.lastX) >> 0;
              var y = (item.y * position - item.lastY) >> 0;
              
              // add this to the total scrolling
              scrollX += x;
              scrollY += y;            
              
              // update last values
              item.lastX += x;
              item.lastY += y;
          
              // delete and step back if it's over
              if (finished) {
                  que.splice(i, 1); i--;
              }           
          }
  
          // scroll left and top
          if (scrollWindow) {
              window.scrollBy(scrollX, scrollY);
          } 
          else {
              if (scrollX) elem.scrollLeft += scrollX;
              if (scrollY) elem.scrollTop  += scrollY;                    
          }
          
          // clean up if there's nothing left to do
          if (!left && !top) {
              que = [];
          }
          
          if (que.length) { 
              requestFrame(step, elem, (delay / options.frameRate + 1)); 
          } else { 
              pending = false;
          }
      };
      
      // start a new queue of actions
      requestFrame(step, elem, 0);
      pending = true;
  }
  
  
  /***********************************************
   * EVENTS
   ***********************************************/
  
  /**
   * Mouse wheel handler.
   * @param {Object} event
   */
  function wheel(event) {
  
      if (!initDone) {
          init();
      }
      
      var target = event.target;
      var overflowing = overflowingAncestor(target);
      
      // use default if there's no overflowing
      // element or default action is prevented    
      if (!overflowing || event.defaultPrevented ||
          isNodeName(activeElement, "embed") ||
         (isNodeName(target, "embed") && /\.pdf/i.test(target.src))) {
          return true;
      }
  
      var deltaX = event.wheelDeltaX || 0;
      var deltaY = event.wheelDeltaY || 0;
      
      // use wheelDelta if deltaX/Y is not available
      if (!deltaX && !deltaY) {
          deltaY = event.wheelDelta || 0;
      }
  
      // check if it's a touchpad scroll that should be ignored
      if (!options.touchpadSupport && isTouchpad(deltaY)) {
          return true;
      }
  
      // scale by step size
      // delta is 120 most of the time
      // synaptics seems to send 1 sometimes
      if (Math.abs(deltaX) > 1.2) {
          deltaX *= options.stepSize / 120;
      }
      if (Math.abs(deltaY) > 1.2) {
          deltaY *= options.stepSize / 120;
      }
      
      scrollArray(overflowing, -deltaX, -deltaY);
      event.preventDefault();
  }
  
  /**
   * Keydown event handler.
   * @param {Object} event
   */
  function keydown(event) {
  
      var target   = event.target;
      var modifier = event.ctrlKey || event.altKey || event.metaKey || 
                    (event.shiftKey && event.keyCode !== key.spacebar);
      
      // do nothing if user is editing text
      // or using a modifier key (except shift)
      // or in a dropdown
      if ( /input|textarea|select|embed/i.test(target.nodeName) ||
           target.isContentEditable || 
           event.defaultPrevented   ||
           modifier ) {
        return true;
      }
      // spacebar should trigger button press
      if (isNodeName(target, "button") &&
          event.keyCode === key.spacebar) {
        return true;
      }
      
      var shift, x = 0, y = 0;
      var elem = overflowingAncestor(activeElement);
      var clientHeight = elem.clientHeight;
  
      if (elem == document.body) {
          clientHeight = window.innerHeight;
      }
  
      switch (event.keyCode) {
          case key.up:
              y = -options.arrowScroll;
              break;
          case key.down:
              y = options.arrowScroll;
              break;         
          case key.spacebar: // (+ shift)
              shift = event.shiftKey ? 1 : -1;
              y = -shift * clientHeight * 0.9;
              break;
          case key.pageup:
              y = -clientHeight * 0.9;
              break;
          case key.pagedown:
              y = clientHeight * 0.9;
              break;
          case key.home:
              y = -elem.scrollTop;
              break;
          case key.end:
              var damt = elem.scrollHeight - elem.scrollTop - clientHeight;
              y = (damt > 0) ? damt+10 : 0;
              break;
          case key.left:
              x = -options.arrowScroll;
              break;
          case key.right:
              x = options.arrowScroll;
              break;            
          default:
              return true; // a key we don't care about
      }
  
      scrollArray(elem, x, y);
      event.preventDefault();
  }
  
  /**
   * Mousedown event only for updating activeElement
   */
  function mousedown(event) {
      activeElement = event.target;
  }
  
  
  /***********************************************
   * OVERFLOW
   ***********************************************/
   
  var cache = {}; // cleared out every once in while
  setInterval(function () { cache = {}; }, 10 * 1000);
  
  var uniqueID = (function () {
      var i = 0;
      return function (el) {
          return el.uniqueID || (el.uniqueID = i++);
      };
  })();
  
  function setCache(elems, overflowing) {
      for (var i = elems.length; i--;)
          cache[uniqueID(elems[i])] = overflowing;
      return overflowing;
  }
  
  function overflowingAncestor(el) {
      var elems = [];
      var rootScrollHeight = root.scrollHeight;
      do {
          var cached = cache[uniqueID(el)];
          if (cached) {
              return setCache(elems, cached);
          }
          elems.push(el);
          if (rootScrollHeight === el.scrollHeight) {
              if (!isFrame || root.clientHeight + 10 < rootScrollHeight) {
                  return setCache(elems, document.body); // scrolling root in WebKit
              }
          } else if (el.clientHeight + 10 < el.scrollHeight) {
              overflow = getComputedStyle(el, "").getPropertyValue("overflow-y");
              if (overflow === "scroll" || overflow === "auto") {
                  return setCache(elems, el);
              }
          }
      } while (el = el.parentNode);
  }
  
  
  /***********************************************
   * HELPERS
   ***********************************************/
  
  function addEvent(type, fn, bubble) {
      window.addEventListener(type, fn, (bubble||false));
  }
  
  function removeEvent(type, fn, bubble) {
      window.removeEventListener(type, fn, (bubble||false));  
  }
  
  function isNodeName(el, tag) {
      return (el.nodeName||"").toLowerCase() === tag.toLowerCase();
  }
  
  function directionCheck(x, y) {
      x = (x > 0) ? 1 : -1;
      y = (y > 0) ? 1 : -1;
      if (direction.x !== x || direction.y !== y) {
          direction.x = x;
          direction.y = y;
          que = [];
          lastScroll = 0;
      }
  }
  
  var deltaBufferTimer;
  
  function isTouchpad(deltaY) {
      if (!deltaY) return;
      deltaY = Math.abs(deltaY)
      deltaBuffer.push(deltaY);
      deltaBuffer.shift();
      clearTimeout(deltaBufferTimer);
      var allDivisable = (isDivisible(deltaBuffer[0], 120) &&
                          isDivisible(deltaBuffer[1], 120) &&
                          isDivisible(deltaBuffer[2], 120));
      return !allDivisable;
  } 
  
  function isDivisible(n, divisor) {
      return (Math.floor(n / divisor) == n / divisor);
  }
  
  var requestFrame = (function () {
        return  window.requestAnimationFrame       || 
                window.webkitRequestAnimationFrame || 
                function (callback, element, delay) {
                    window.setTimeout(callback, delay || (1000/60));
                };
  })();
  
  
  /***********************************************
   * PULSE
   ***********************************************/
   
  /**
   * Viscous fluid with a pulse for part and decay for the rest.
   * - Applies a fixed force over an interval (a damped acceleration), and
   * - Lets the exponential bleed away the velocity over a longer interval
   * - Michael Herf, http://stereopsis.com/stopping/
   */
  function pulse_(x) {
      var val, start, expx;
      // test
      x = x * options.pulseScale;
      if (x < 1) { // acceleartion
          val = x - (1 - Math.exp(-x));
      } else {     // tail
          // the previous animation ended here:
          start = Math.exp(-1);
          // simple viscous drag
          x -= 1;
          expx = 1 - Math.exp(-x);
          val = start + (expx * (1 - start));
      }
      return val * options.pulseNormalize;
  }
  
  function pulse(x) {
      if (x >= 1) return 1;
      if (x <= 0) return 0;
  
      if (options.pulseNormalize == 1) {
          options.pulseNormalize /= pulse_(1);
      }
      return pulse_(x);
  }
  
  var isChrome = /chrome/i.test(window.navigator.userAgent);
  var wheelEvent = null;
  if ("onwheel" in document.createElement("div"))
  	wheelEvent = "wheel";
  else if ("onmousewheel" in document.createElement("div"))
  	wheelEvent = "mousewheel";
  
  if (wheelEvent && isChrome) {
  	addEvent(wheelEvent, wheel);
  	addEvent("mousedown", mousedown);
  	addEvent("load", init);
  }
  
  })();