How to have a Smooth/Fast scroll in mobile popup window?

My website https://harfrooz.com opens articles in a popup window. Everything is OK on the PC. But on mobile devices, after I open an article in the popup window, scrolling up/down doesn’t move smoothly and it’s slow. I have no idea how to fix this.
Help please

 

Hi Friends,
Sorry I must correct the site address to this: http://dev.harfrooz.com/
I searched a lot and I found out that my problem is related to iscroll.js File. I'll add content of this file here. If you know javascrip can you please take a look and tell me what parameters should I cahnge in this file to have a smoother and faster scroll for popup in mobile devices. Thanks

/*!
* iScroll v4.1.9 ~ Copyright (c) 2011 Matteo Spinelli, http://cubiq.org
* Released under MIT license, http://cubiq.org/license
*/
(function($){
var m = Math,
    mround = function (r) { return r >> 0; },
    vendor = (/webkit/i).test(navigator.appVersion) ? 'webkit' :
        (/firefox/i).test(navigator.userAgent) ? 'Moz' :
        (/trident/i).test(navigator.userAgent) ? 'ms' :
        'opera' in window ? 'O' : '',

    // Browser capabilities
    isAndroid = (/android/gi).test(navigator.appVersion),
    isIDevice = (/iphone|ipad/gi).test(navigator.appVersion),
    isPlaybook = (/playbook/gi).test(navigator.appVersion),
    isTouchPad = (/hp-tablet/gi).test(navigator.appVersion),

    has3d = 'WebKitCSSMatrix' in window && 'm11' in new WebKitCSSMatrix(),
    hasTouch = 'ontouchstart' in window && !isTouchPad,
    hasTransform = vendor + 'Transform' in document.documentElement.style,
    hasTransitionEnd = isIDevice || isPlaybook,

    nextFrame = (function() {
        return window.requestAnimationFrame
            || window.webkitRequestAnimationFrame
            || window.mozRequestAnimationFrame
            || window.oRequestAnimationFrame
            || window.msRequestAnimationFrame
            || function(callback) { return setTimeout(callback, 1); }
    })(),
    cancelFrame = (function () {
        return window.cancelRequestAnimationFrame
            || window.webkitCancelAnimationFrame
            || window.webkitCancelRequestAnimationFrame
            || window.mozCancelRequestAnimationFrame
            || window.oCancelRequestAnimationFrame
            || window.msCancelRequestAnimationFrame
            || clearTimeout
    })(),

    // Events
    RESIZE_EV = 'onorientationchange' in window ? 'orientationchange' : 'resize',
    START_EV = hasTouch ? 'touchstart' : 'mousedown',
    MOVE_EV = hasTouch ? 'touchmove' : 'mousemove',
    END_EV = hasTouch ? 'touchend' : 'mouseup',
    CANCEL_EV = hasTouch ? 'touchcancel' : 'mouseup',
    WHEEL_EV = vendor == 'Moz' ? 'DOMMouseScroll' : 'mousewheel',

    // Helpers
    trnOpen = 'translate' + (has3d ? '3d(' : '('),
    trnClose = has3d ? ',0)' : ')',

    // Constructor
    iScroll = function (el, options) {
        var that = this,
            doc = document,
            i;

        that.wrapper = typeof el == 'object' ? el : doc.getElementById(el);
        that.scroller = that.wrapper.children[0];

        // Default options
        that.options = {
            hScroll: true,
            vScroll: true,
            x: 0,
            y: 0,
            bounce: true,
            bounceLock: false,
            momentum: true,
            lockDirection: true,
            useTransform: true,
            useTransition: false,
            topOffset: 0,
            checkDOMChanges: false,        // Experimental
            overflow: 'xy',

            // Scrollbar
            hScrollbar: true,
            vScrollbar: true,
            fixedScrollbar: isAndroid,
            hideScrollbar: isIDevice,
            fadeScrollbar: isIDevice && has3d,
            scrollbarClass: '',

            // Zoom
            zoom: false,
            zoomMin: 1,
            zoomMax: 4,
            doubleTapZoom: 2,
            wheelAction: 'scroll',

            // Snap
            snap: false,
            snapThreshold: 1,

            // Events
            onRefresh: null,
            onBeforeScrollStart: function (e) { e.preventDefault(); },
            onScrollStart: null,
            onBeforeScrollMove: null,
            onScrollMove: null,
            onBeforeScrollEnd: null,
            onScrollEnd: null,
            onTouchEnd: null,
            onDestroy: null,
            onZoomStart: null,
            onZoom: null,
            onZoomEnd: null,
           
            scroller: null
        };

        // User defined options
        for (i in options) that.options[i] = options[i];
       
        if(that.options.overflow.indexOf('x') != -1){
            that.wrapper.style.overflowX = 'hidden';
        }
        if (that.options.overflow.indexOf('y') != -1) {
            that.wrapper.style.overflowY = 'hidden';
        }
       
        if(that.options.scroller){
            that.scroller = that.options.scroller;
        }
       
        // Set starting position
        that.x = that.options.x;
        that.y = that.options.y;

        // Normalize options
        that.options.useTransform = hasTransform ? that.options.useTransform : false;
        that.options.hScrollbar = that.options.hScroll && that.options.hScrollbar;
        that.options.vScrollbar = that.options.vScroll && that.options.vScrollbar;
        that.options.zoom = that.options.useTransform && that.options.zoom;
        that.options.useTransition = hasTransitionEnd && that.options.useTransition;

        // Helpers FIX ANDROID BUG!
        // translate3d and scale doesn't work together!
        // Ignoring 3d ONLY WHEN YOU SET that.options.zoom
        if ( that.options.zoom && isAndroid ){
            trnOpen = 'translate(';
            trnClose = ')';
        }
       
        // Set some default styles
        that.scroller.style[vendor + 'TransitionProperty'] = that.options.useTransform ? '-' + vendor.toLowerCase() + '-transform' : 'top left';
        that.scroller.style[vendor + 'TransitionDuration'] = '0';
        that.scroller.style[vendor + 'TransformOrigin'] = '0 0';
        if (that.options.useTransition) that.scroller.style[vendor + 'TransitionTimingFunction'] = 'cubic-bezier(0.33,0.66,0.66,1)';
       
        if (that.options.useTransform) that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose;
        else that.scroller.style.cssText += ';position:absolute;top:' + that.y + 'px;left:' + that.x + 'px';

        if (that.options.useTransition) that.options.fixedScrollbar = true;

        that.refresh();

        that._bind(RESIZE_EV, window);
       
        if (!hasTouch) {
            that._bind('mouseout', that.wrapper);
            if (that.options.wheelAction != 'none')
                //that._bind(WHEEL_EV);
                $(that.scroller).bind('mousewheel', $.proxy(that._wheel, that));
        } else {
            that._bind(START_EV);
        }

        if (that.options.checkDOMChanges) that.checkDOMTime = setInterval(function () {
            that._checkDOMChanges();
        }, 2000);
       
        if(!hasTouch){
            that.menter = 0;
            $(that.wrapper).bind('mouseenter.iscroll', function(){
                that.menter = 1;
                $(that.vScrollbarWrapper).stop().fadeTo(250, 1);
            }).bind('mouseleave.iscroll', function(){
                that.menter = 0;
               
                if(!that.dMouseDown){
                    $(that.vScrollbarWrapper).stop().fadeTo(250, 0);
                }
            });
        }
    };

// Prototype
iScroll.prototype = {
    enabled: true,
    x: 0,
    y: 0,
    steps: [],
    scale: 1,
    currPageX: 0, currPageY: 0,
    pagesX: [], pagesY: [],
    aniTime: null,
    wheelZoomCount: 0,
   
    handleEvent: function (e) {
        var that = this;
        switch(e.type) {
            case START_EV:
                if (!hasTouch && e.button !== 0) return;
                that._start(e);
                break;
            case MOVE_EV: that._move(e); break;
            case END_EV:
            case CANCEL_EV: that._end(e); break;
            case RESIZE_EV: that._resize(); break;
            case WHEEL_EV: that._wheel(e); break;
            case 'mouseout': that._mouseout(e); break;
            case 'webkitTransitionEnd': that._transitionEnd(e); break;
        }
    },
   
    _checkDOMChanges: function () {
        if (this.moved || this.zoomed || this.animating ||
            (this.scrollerW == this.scroller.offsetWidth * this.scale && this.scrollerH == this.scroller.offsetHeight * this.scale)) return;

        this.refresh();
    },
   
    _scrollbar: function (dir) {
        var that = this,
            doc = document,
            bar;

        if (!that[dir + 'Scrollbar']) {
            if (that[dir + 'ScrollbarWrapper']) {
                if (hasTransform) that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = '';
                $(that[dir + 'ScrollbarWrapper']).remove();
                that[dir + 'ScrollbarWrapper'] = null;
                that[dir + 'ScrollbarIndicator'] = null;
            }

            return;
        }

        if (!that[dir + 'ScrollbarWrapper']) {
            // Create the scrollbar wrapper
            bar = doc.createElement('div');

            if (that.options.scrollbarClass) bar.className = that.options.scrollbarClass + dir.toUpperCase();
            else bar.style.cssText = 'position:absolute;z-index:100;' + (dir == 'h' ? 'height:7px;bottom:1px;left:2px;right:' + (that.vScrollbar ? '7' : '2') + 'px' : 'width:7px;bottom:' + (that.hScrollbar ? '7' : '2') + 'px;top:2px;right:1px');

            bar.style.cssText += (hasTouch ? ';pointer-events:none' : '') + (that.options.hideScrollbar ? (';-' + vendor + '-transition-property:opacity;-' + vendor + '-transition-duration:' + (that.options.fadeScrollbar ? '350ms' : '0')) : '') + ';overflow:hidden;opacity:' + (that.options.hideScrollbar ? '0' : '1');

            that.wrapper.appendChild(bar);
            that[dir + 'ScrollbarWrapper'] = bar;

            // Create the scrollbar indicator
            bar = doc.createElement('div');
            if (!that.options.scrollbarClass) {
                bar.style.cssText = 'position:absolute;z-index:100;background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.9);-' + vendor + '-background-clip:padding-box;-' + vendor + '-box-sizing:border-box;' + (dir == 'h' ? 'height:100%' : 'width:100%') + ';-' + vendor + '-border-radius:3px;border-radius:3px';
            }
            bar.style.cssText += (hasTouch ? ';pointer-events:none' : '') + ';-' + vendor + '-transition-property:-' + vendor + '-transform;-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1);-' + vendor + '-transition-duration:0; ' + (that.options.useTransform ? ('-' + vendor + '-transform:' + trnOpen + '0,0' + trnClose) : '');
           
            if (that.options.useTransition) bar.style.cssText += ';-' + vendor + '-transition-timing-function:cubic-bezier(0.33,0.66,0.66,1)';

            that[dir + 'ScrollbarWrapper'].appendChild(bar);
            that[dir + 'ScrollbarIndicator'] = bar;
           
            if(!hasTouch){
                that.dMouse = {h: 0, v: 0};
                that.dPos = {h: 0, v: 0};
                that.dMouseDown = 0;
                var downhandler = function(oEvent){
                        that.dMouse[dir] = (dir == 'h' ? oEvent.pageX : oEvent.pageY);
                        that.dPos[dir] = (dir == 'h' ? that.x : that.y) * that[dir + 'ScrollbarProp'];
                        that.dMouseDown = 1;
                       
                        $('<div id="scrollmask"></div>').css({position: 'fixed', top: 0, left: 0, width: '100%', height: '100%', zIndex: 2147483645, background: 'transparent'}).appendTo(document.body);
                        $(document).bind('mousemove', movehandler).bind('mouseup', uphandler);
                        return false;
                    },
                   
                    movehandler = function (oEvent){
                        if(that.dMouseDown){
                            var pos = Math.min((dir == 'h' ? that.hScrollbarMaxScroll : that.vScrollbarMaxScroll), Math.max(0, (dir == 'h' ? oEvent.pageX : oEvent.pageY) - that.dMouse[dir] + that.dPos[dir]));
                            that.scrollTo(dir == 'h' ? pos / that.hScrollbarProp : 0, dir == 'h' ? 0 : pos / that.vScrollbarProp, 0);
                           
                            return false;
                        }
                    },
                   
                    uphandler = function(){
                        that.dMouseDown = 0;
                        if(!hasTouch && !that.menter){
                            $(that.vScrollbarWrapper).stop().fadeTo(250, 0);
                        }
                       
                        $('#scrollmask').remove();
                        $(document).unbind('mousemove', movehandler).unbind('mouseup', uphandler);
                        return false;
                    };
               
                $(bar).bind('mousedown', downhandler);   
               
                $(that[dir + 'ScrollbarWrapper']).bind('click', function(oEvent){
                    var pos = Math.min((dir == 'h' ? that.hScrollbarMaxScroll : that.vScrollbarMaxScroll), Math.max(0, (dir == 'h' ? oEvent.pageX : oEvent.pageY) - $(this).offset().top));
                    that.scrollTo(dir == 'h' ? pos / that.hScrollbarProp : 0, dir == 'h' ? 0 : pos / that.vScrollbarProp, 250);
                });
            }
        }

        if (dir == 'h') {
            that.hScrollbarSize = that.hScrollbarWrapper.clientWidth;
            that.hScrollbarIndicatorSize = m.max(mround(that.hScrollbarSize * that.hScrollbarSize / that.scrollerW), 8);
            that.hScrollbarIndicator.style.width = that.hScrollbarIndicatorSize + 'px';
            that.hScrollbarMaxScroll = that.hScrollbarSize - that.hScrollbarIndicatorSize;
            that.hScrollbarProp = that.hScrollbarMaxScroll / that.maxScrollX;
        } else {
            that.vScrollbarSize = that.vScrollbarWrapper.clientHeight;
            that.vScrollbarIndicatorSize = m.max(mround(that.vScrollbarSize * that.vScrollbarSize / that.scrollerH), 8);
            that.vScrollbarIndicator.style.height = that.vScrollbarIndicatorSize + 'px';
            that.vScrollbarMaxScroll = that.vScrollbarSize - that.vScrollbarIndicatorSize;
            that.vScrollbarProp = that.vScrollbarMaxScroll / that.maxScrollY;
        }

        // Reset position
        that._scrollbarPos(dir, true);
    },
   
    _resize: function () {
        var that = this;
        setTimeout(function () { that.refresh(); }, isAndroid ? 200 : 0);
    },
   
    _pos: function (x, y) {
        x = this.hScroll ? x : 0;
        y = this.vScroll ? y : 0;

        if (this.options.useTransform) {
            this.scroller.style[vendor + 'Transform'] = trnOpen + x + 'px,' + y + 'px' + trnClose + ' scale(' + this.scale + ')';
        } else {
            x = mround(x);
            y = mround(y);
            this.scroller.style.left = x + 'px';
            this.scroller.style.top = y + 'px';
        }

        this.x = x;
        this.y = y;

        this._scrollbarPos('h');
        this._scrollbarPos('v');
    },

    _scrollbarPos: function (dir, hidden) {
        var that = this,
            pos = dir == 'h' ? that.x : that.y,
            size;

        if (!that[dir + 'Scrollbar']) return;

        pos = that[dir + 'ScrollbarProp'] * pos;

        if (pos < 0) {
            if (!that.options.fixedScrollbar) {
                size = that[dir + 'ScrollbarIndicatorSize'] + mround(pos * 3);
                if (size < 20) size = 20;
                that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
            }
            pos = 0;
        } else if (pos > that[dir + 'ScrollbarMaxScroll']) {
            if (!that.options.fixedScrollbar) {
                size = that[dir + 'ScrollbarIndicatorSize'] - mround((pos - that[dir + 'ScrollbarMaxScroll']) * 3);
                if (size < 20) size = 20;
                that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'width' : 'height'] = size + 'px';
                pos = that[dir + 'ScrollbarMaxScroll'] + (that[dir + 'ScrollbarIndicatorSize'] - size);
            } else {
                pos = that[dir + 'ScrollbarMaxScroll'];
            }
        }

        that[dir + 'ScrollbarWrapper'].style[vendor + 'TransitionDelay'] = '0';
        that[dir + 'ScrollbarWrapper'].style.opacity = hidden && that.options.hideScrollbar ? '0' : '1';
       
        if(that.options.useTransform){
            that[dir + 'ScrollbarIndicator'].style[vendor + 'Transform'] = trnOpen + (dir == 'h' ? pos + 'px,0' : '0,' + pos + 'px') + trnClose;
        } else {
            that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'left' : 'top'] =  (pos) + 'px';
        }
        if($.browser.msie && $.browser.version < 9){
            that[dir + 'ScrollbarIndicator'].style[dir == 'h' ? 'left' : 'top'] =  (pos) + 'px';
        }
    },
   
    _start: function (e) {
        var that = this,
            point = hasTouch ? e.touches[0] : e,
            matrix, x, y,
            c1, c2;

        if (!that.enabled) return;

        if (that.options.onBeforeScrollStart) that.options.onBeforeScrollStart.call(that, e);

        if (that.options.useTransition || that.options.zoom) that._transitionTime(0);

        that.moved = false;
        that.animating = false;
        that.zoomed = false;
        that.distX = 0;
        that.distY = 0;
        that.absDistX = 0;
        that.absDistY = 0;
        that.dirX = 0;
        that.dirY = 0;

        // Gesture start
        if (that.options.zoom && hasTouch && e.touches.length > 1) {
            c1 = m.abs(e.touches[0].pageX-e.touches[1].pageX);
            c2 = m.abs(e.touches[0].pageY-e.touches[1].pageY);
            that.touchesDistStart = m.sqrt(c1 * c1 + c2 * c2);

            that.originX = m.abs(e.touches[0].pageX + e.touches[1].pageX - that.wrapperOffsetLeft * 2) / 2 - that.x;
            that.originY = m.abs(e.touches[0].pageY + e.touches[1].pageY - that.wrapperOffsetTop * 2) / 2 - that.y;

            if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
        }

        if (that.options.momentum) {
            if (that.options.useTransform) {
                // Very lame general purpose alternative to CSSMatrix
                matrix = getComputedStyle(that.scroller, null)[vendor + 'Transform'].replace(/[^0-9-.,]/g, '').split(',');
                x = matrix[4] * 1;
                y = matrix[5] * 1;
            } else {
                x = $(that.scroller).css('left').replace(/[^0-9-]/g, '') * 1;
                y = $(that.scroller).css('top').replace(/[^0-9-]/g, '') * 1;
            }
           
            if (x != that.x || y != that.y) {
                if (that.options.useTransition) that._unbind('webkitTransitionEnd');
                else cancelFrame(that.aniTime);
                that.steps = [];
                that._pos(x, y);
            }
        }

        that.absStartX = that.x;    // Needed by snap threshold
        that.absStartY = that.y;

        that.startX = that.x;
        that.startY = that.y;
        that.pointX = point.pageX;
        that.pointY = point.pageY;

        that.startTime = e.timeStamp || Date.now();

        if (that.options.onScrollStart) that.options.onScrollStart.call(that, e);
       
        that._bind(MOVE_EV);
        that._bind(END_EV);
        that._bind(CANCEL_EV);
    },
   
    _move: function (e) {
        var that = this,
            point = hasTouch ? e.touches[0] : e,
            deltaX = point.pageX - that.pointX,
            deltaY = point.pageY - that.pointY,
            newX = that.x + deltaX,
            newY = that.y + deltaY,
            c1, c2, scale,
            timestamp = e.timeStamp || Date.now();

        if (that.options.onBeforeScrollMove) that.options.onBeforeScrollMove.call(that, e);

        // Zoom
        if (that.options.zoom && hasTouch && e.touches.length > 1) {
            c1 = m.abs(e.touches[0].pageX - e.touches[1].pageX);
            c2 = m.abs(e.touches[0].pageY - e.touches[1].pageY);
            that.touchesDist = m.sqrt(c1*c1+c2*c2);

            that.zoomed = true;

            scale = 1 / that.touchesDistStart * that.touchesDist * this.scale;

            if (scale < that.options.zoomMin) scale = 0.5 * that.options.zoomMin * Math.pow(2.0, scale / that.options.zoomMin);
            else if (scale > that.options.zoomMax) scale = 2.0 * that.options.zoomMax * Math.pow(0.5, that.options.zoomMax / scale);

            that.lastScale = scale / this.scale;

            newX = this.originX - this.originX * that.lastScale + this.x,
            newY = this.originY - this.originY * that.lastScale + this.y;

            this.scroller.style[vendor + 'Transform'] = trnOpen + newX + 'px,' + newY + 'px' + trnClose + ' scale(' + scale + ')';

            if (that.options.onZoom) that.options.onZoom.call(that, e);
            return;
        }

        that.pointX = point.pageX;
        that.pointY = point.pageY;

        // Slow down if outside of the boundaries
        if (newX > 0 || newX < that.maxScrollX) {
            newX = that.options.bounce ? that.x + (deltaX / 2) : newX >= 0 || that.maxScrollX >= 0 ? 0 : that.maxScrollX;
        }
        if (newY > that.minScrollY || newY < that.maxScrollY) {
            newY = that.options.bounce ? that.y + (deltaY / 2) : newY >= that.minScrollY || that.maxScrollY >= 0 ? that.minScrollY : that.maxScrollY;
        }

        that.distX += deltaX;
        that.distY += deltaY;
        that.absDistX = m.abs(that.distX);
        that.absDistY = m.abs(that.distY);

        if (that.absDistX < 6 && that.absDistY < 6) {
            return;
        }

        // Lock direction
        if (that.options.lockDirection) {
            if (that.absDistX > that.absDistY + 5) {
                newY = that.y;
                deltaY = 0;
            } else if (that.absDistY > that.absDistX + 5) {
                newX = that.x;
                deltaX = 0;
            }
        }

        that.moved = true;
        that._pos(newX, newY);
        that.dirX = deltaX > 0 ? -1 : deltaX < 0 ? 1 : 0;
        that.dirY = deltaY > 0 ? -1 : deltaY < 0 ? 1 : 0;

        if (timestamp - that.startTime > 300) {
            that.startTime = timestamp;
            that.startX = that.x;
            that.startY = that.y;
        }
       
        if (that.options.onScrollMove) that.options.onScrollMove.call(that, e);
    },
   
    _end: function (e) {
        if (hasTouch && e.touches.length != 0) return;

        var that = this,
            point = hasTouch ? e.changedTouches[0] : e,
            target, ev,
            momentumX = { dist:0, time:0 },
            momentumY = { dist:0, time:0 },
            duration = (e.timeStamp || Date.now()) - that.startTime,
            newPosX = that.x,
            newPosY = that.y,
            distX, distY,
            newDuration,
            snap,
            scale;

        that._unbind(MOVE_EV);
        that._unbind(END_EV);
        that._unbind(CANCEL_EV);
       
        if (that.options.onBeforeScrollEnd) that.options.onBeforeScrollEnd.call(that, e);

        if (that.zoomed) {
            scale = that.scale * that.lastScale;
            scale = Math.max(that.options.zoomMin, scale);
            scale = Math.min(that.options.zoomMax, scale);
            that.lastScale = scale / that.scale;
            that.scale = scale;

            that.x = that.originX - that.originX * that.lastScale + that.x;
            that.y = that.originY - that.originY * that.lastScale + that.y;
           
            that.scroller.style[vendor + 'TransitionDuration'] = '200ms';
            that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + that.scale + ')';
           
            that.zoomed = false;
            that.refresh();

            if (that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
            return;
        }

        if (!that.moved) {
            if (hasTouch) {
                if (that.doubleTapTimer && that.options.zoom) {
                    // Double tapped
                    clearTimeout(that.doubleTapTimer);
                    that.doubleTapTimer = null;
                    if (that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                    that.zoom(that.pointX, that.pointY, that.scale == 1 ? that.options.doubleTapZoom : 1);
                    if (that.options.onZoomEnd) {
                        setTimeout(function() {
                            that.options.onZoomEnd.call(that, e);
                        }, 200); // 200 is default zoom duration
                    }
                } else {
                    that.doubleTapTimer = setTimeout(function () {
                        that.doubleTapTimer = null;

                        // Find the last touched element
                        target = point.target;
                        while (target.nodeType != 1) target = target.parentNode;

                        if (target.tagName != 'SELECT' && target.tagName != 'INPUT' && target.tagName != 'TEXTAREA') {
                            ev = document.createEvent('MouseEvents');
                            ev.initMouseEvent('click', true, true, e.view, 1,
                                point.screenX, point.screenY, point.clientX, point.clientY,
                                e.ctrlKey, e.altKey, e.shiftKey, e.metaKey,
                                0, null);
                            ev._fake = true;
                            target.dispatchEvent(ev);
                        }
                    }, that.options.zoom ? 250 : 0);
                }
            }

            that._resetPos(200);

            if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
            return;
        }

Code (JavaScript):

 

Rest of the code:

        if (duration < 300 && that.options.momentum) {
            momentumX = newPosX ? that._momentum(newPosX - that.startX, duration, -that.x, that.scrollerW - that.wrapperW + that.x, that.options.bounce ? that.wrapperW : 0) : momentumX;
            momentumY = newPosY ? that._momentum(newPosY - that.startY, duration, -that.y, (that.maxScrollY < 0 ? that.scrollerH - that.wrapperH + that.y - that.minScrollY : 0), that.options.bounce ? that.wrapperH : 0) : momentumY;

            newPosX = that.x + momentumX.dist;
            newPosY = that.y + momentumY.dist;

             if ((that.x > 0 && newPosX > 0) || (that.x < that.maxScrollX && newPosX < that.maxScrollX)) momentumX = { dist:0, time:0 };
             if ((that.y > that.minScrollY && newPosY > that.minScrollY) || (that.y < that.maxScrollY && newPosY < that.maxScrollY)) momentumY = { dist:0, time:0 };
        }

        if (momentumX.dist || momentumY.dist) {
            newDuration = m.max(m.max(momentumX.time, momentumY.time), 10);

            // Do we need to snap?
            if (that.options.snap) {
                distX = newPosX - that.absStartX;
                distY = newPosY - that.absStartY;
                if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) { that.scrollTo(that.absStartX, that.absStartY, 200); }
                else {
                    snap = that._snap(newPosX, newPosY);
                    newPosX = snap.x;
                    newPosY = snap.y;
                    newDuration = m.max(snap.time, newDuration);
                }
            }

            that.scrollTo(mround(newPosX), mround(newPosY), newDuration);

            if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
            return;
        }

        // Do we need to snap?
        if (that.options.snap) {
            distX = newPosX - that.absStartX;
            distY = newPosY - that.absStartY;
            if (m.abs(distX) < that.options.snapThreshold && m.abs(distY) < that.options.snapThreshold) that.scrollTo(that.absStartX, that.absStartY, 200);
            else {
                snap = that._snap(that.x, that.y);
                if (snap.x != that.x || snap.y != that.y) that.scrollTo(snap.x, snap.y, snap.time);
            }

            if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
            return;
        }

        that._resetPos(200);
        if (that.options.onTouchEnd) that.options.onTouchEnd.call(that, e);
    },
   
    _resetPos: function (time) {
        var that = this,
            resetX = that.x >= 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x,
            resetY = that.y >= that.minScrollY || that.maxScrollY > 0 ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

        if (resetX == that.x && resetY == that.y) {
            if (that.moved) {
                that.moved = false;
                if (that.options.onScrollEnd) that.options.onScrollEnd.call(that);        // Execute custom code on scroll end
            }

            if (that.hScrollbar && that.options.hideScrollbar) {
                if (vendor == 'webkit') that.hScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
                that.hScrollbarWrapper.style.opacity = '0';
            }
            if (that.vScrollbar && that.options.hideScrollbar) {
                if (vendor == 'webkit') that.vScrollbarWrapper.style[vendor + 'TransitionDelay'] = '300ms';
                that.vScrollbarWrapper.style.opacity = '0';
            }

            return;
        }

        that.scrollTo(resetX, resetY, time || 0);
    },

    _wheel: function (e, jwhich) {
        var that = this,
            wheelDeltaX, wheelDeltaY,
            deltaX, deltaY,
            deltaScale;
           
        if(typeof e == 'number'){
            wheelDeltaX = wheelDeltaY = e * 30;
        } else {
            if ('wheelDeltaX' in e) {
                wheelDeltaX = e.wheelDeltaX / 12;
                wheelDeltaY = e.wheelDeltaY / 12;
            } else if('wheelDelta' in e) {
                wheelDeltaX = wheelDeltaY = e.wheelDelta / 12;
            } else if ('detail' in e) {
                wheelDeltaX = wheelDeltaY = -e.detail * 3;
            } else if( typeof jwhich != 'undefined' ){
                wheelDeltaX = wheelDeltaY = jwhich * 30;
            } else {
                return;
            }
           
            e.preventDefault();
            e.stopPropagation();
           
            if (that.options.wheelAction == 'zoom') {
                deltaScale = that.scale * Math.pow(2, 1/3 * (wheelDeltaY ? wheelDeltaY / Math.abs(wheelDeltaY) : 0));
                if (deltaScale < that.options.zoomMin) deltaScale = that.options.zoomMin;
                if (deltaScale > that.options.zoomMax) deltaScale = that.options.zoomMax;
               
                if (deltaScale != that.scale) {
                    if (!that.wheelZoomCount && that.options.onZoomStart) that.options.onZoomStart.call(that, e);
                    that.wheelZoomCount++;
                   
                    that.zoom(e.pageX, e.pageY, deltaScale, 400);
                   
                    setTimeout(function() {
                        that.wheelZoomCount--;
                        if (!that.wheelZoomCount && that.options.onZoomEnd) that.options.onZoomEnd.call(that, e);
                    }, 400);
                }
               
                return;
            }
        }
       
        deltaX = that.x + wheelDeltaX;
        deltaY = that.y + wheelDeltaY;

        if (deltaX > 0) deltaX = 0;
        else if (deltaX < that.maxScrollX) deltaX = that.maxScrollX;

        if (deltaY > that.minScrollY) deltaY = that.minScrollY;
        else if (deltaY < that.maxScrollY) deltaY = that.maxScrollY;

        that.scrollTo(deltaX, deltaY, 0);
    },
   
    _mouseout: function (e) {
        var t = e.relatedTarget;

        if (!t) {
            this._end(e);
            return;
        }

        while (t = t.parentNode) if (t == this.wrapper) return;
       
        this._end(e);
    },

    _transitionEnd: function (e) {
        var that = this;

        if (e.target != that.scroller) return;

        that._unbind('webkitTransitionEnd');
       
        that._startAni();
    },


    /**
     *
     * Utilities
     *
     */
    _startAni: function () {
        var that = this,
            startX = that.x, startY = that.y,
            startTime = Date.now(),
            step, easeOut,
            animate;

        if (that.animating) return;
       
        if (!that.steps.length) {
            that._resetPos(400);
            return;
        }
       
        step = that.steps.shift();
       
        if (step.x == startX && step.y == startY) step.time = 0;

        that.animating = true;
        that.moved = true;
       
        if (that.options.useTransition) {
            that._transitionTime(step.time);
            that._pos(step.x, step.y);
            that.animating = false;
            if (step.time) that._bind('webkitTransitionEnd');
            else that._resetPos(0);
            return;
        }

        animate = function () {
            var now = Date.now(),
                newX, newY;

            if (now >= startTime + step.time) {
                that._pos(step.x, step.y);
                that.animating = false;
                if (that.options.onAnimationEnd) that.options.onAnimationEnd.call(that);            // Execute custom code on animation end
                that._startAni();
                return;
            }

            now = (now - startTime) / step.time - 1;
            easeOut = m.sqrt(1 - now * now);
            newX = (step.x - startX) * easeOut + startX;
            newY = (step.y - startY) * easeOut + startY;
            that._pos(newX, newY);
            if (that.animating) that.aniTime = nextFrame(animate);
        };

        animate();
    },

    _transitionTime: function (time) {
        time += 'ms';
        this.scroller.style[vendor + 'TransitionDuration'] = time;
        if (this.hScrollbar) this.hScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
        if (this.vScrollbar) this.vScrollbarIndicator.style[vendor + 'TransitionDuration'] = time;
    },

    _momentum: function (dist, time, maxDistUpper, maxDistLower, size) {
        var deceleration = 0.0006,
            speed = m.abs(dist) / time,
            newDist = (speed * speed) / (2 * deceleration),
            newTime = 0, outsideDist = 0;

        // Proportinally reduce speed if we are outside of the boundaries
        if (dist > 0 && newDist > maxDistUpper) {
            outsideDist = size / (6 / (newDist / speed * deceleration));
            maxDistUpper = maxDistUpper + outsideDist;
            speed = speed * maxDistUpper / newDist;
            newDist = maxDistUpper;
        } else if (dist < 0 && newDist > maxDistLower) {
            outsideDist = size / (6 / (newDist / speed * deceleration));
            maxDistLower = maxDistLower + outsideDist;
            speed = speed * maxDistLower / newDist;
            newDist = maxDistLower;
        }

        newDist = newDist * (dist < 0 ? -1 : 1);
        newTime = speed / deceleration;

        return { dist: newDist, time: mround(newTime) };
    },

    _offset: function (el) {
        if($.browser.msie && $.browser.version < 9){
            var offs = $(el).offset(),
                left = -offs.left,
                top = -offs.top;
        } else {
       
            var left = -el.offsetLeft,
                top = -el.offsetTop;
               
            while (el = el.offsetParent) {
                left -= el.offsetLeft;
                top -= el.offsetTop;
            }
        }
       
        if (el != this.wrapper) {
            left *= this.scale;
            top *= this.scale;
        }

        return { left: left, top: top };
    },

    _snap: function (x, y) {
        var that = this,
            i, l,
            page, time,
            sizeX, sizeY;

        // Check page X
        page = that.pagesX.length - 1;
        for (i=0, l=that.pagesX.length; i<l; i++) {
            if (x >= that.pagesX[i]) {
                page = i;
                break;
            }
        }
        if (page == that.currPageX && page > 0 && that.dirX < 0) page--;
        x = that.pagesX[page];
        sizeX = m.abs(x - that.pagesX[that.currPageX]);
        sizeX = sizeX ? m.abs(that.x - x) / sizeX * 500 : 0;
        that.currPageX = page;

        // Check page Y
        page = that.pagesY.length-1;
        for (i=0; i<page; i++) {
            if (y >= that.pagesY[i]) {
                page = i;
                break;
            }
        }
        if (page == that.currPageY && page > 0 && that.dirY < 0) page--;
        y = that.pagesY[page];
        sizeY = m.abs(y - that.pagesY[that.currPageY]);
        sizeY = sizeY ? m.abs(that.y - y) / sizeY * 500 : 0;
        that.currPageY = page;

        // Snap with constant speed (proportional duration)
        time = mround(m.max(sizeX, sizeY)) || 200;

        return { x: x, y: y, time: time };
    },

    _bind: function (type, el, bubble) {
        var elm = (el || this.scroller);
        if(elm.addEventListener){
            elm.addEventListener(type, this, !!bubble);
        } else {
            var func = null;
            switch(type) {
                case START_EV:
                    func = $.proxy(this._start, this);
                    break;
                case MOVE_EV:
                    func = $.proxy(this._move, this);
                    break;
                case END_EV:
                case CANCEL_EV:
                    func = $.proxy(this._end, this);
                    break;
                case RESIZE_EV:
                    func = $.proxy(this._resize, this);
                    break;
                case WHEEL_EV:
                    func = $.proxy(this._wheel, this);
                    break;
                case 'mouseout':
                    func = $.proxy(this._mouseout, this);
                    break;
            }
           
            if(func){
                $(elm).bind(type + '.iscroll', func);
            }
        }
    },

    _unbind: function (type, el, bubble) {
        var elm = (el || this.scroller);
        if(elm.removeEventListener){
            elm.removeEventListener(type, this, !!bubble);
        } else {
            $(elm).unbind(type + '.iscroll');
        }
    },


    /**
     *
     * Public methods
     *
     */
    destroy: function () {
        var that = this;

        that.scroller.style[vendor + 'Transform'] = '';

        // Remove the scrollbars
        that.hScrollbar = false;
        that.vScrollbar = false;
        that._scrollbar('h');
        that._scrollbar('v');

        // Remove the event listeners
        that._unbind(RESIZE_EV, window);
        that._unbind(START_EV);
        that._unbind(MOVE_EV);
        that._unbind(END_EV);
        that._unbind(CANCEL_EV);
       
        if (!that.options.hasTouch) {
            that._unbind('mouseout', that.wrapper);
            that._unbind(WHEEL_EV);
        }
       
        if (that.options.useTransition) that._unbind('webkitTransitionEnd');
       
        if (that.options.checkDOMChanges) clearInterval(that.checkDOMTime);
       
        if (that.options.onDestroy) that.options.onDestroy.call(that);
       
        $(that.wrapper).unbind('mouseleave.iscroll').unbind('mouseenter.iscroll');
    },

    refresh: function () {
        var that = this,
            offset,
            i, l,
            els,
            pos = 0,
            page = 0;

        if (that.scale < that.options.zoomMin) that.scale = that.options.zoomMin;
        that.wrapperW = that.wrapper.clientWidth || 1;
        that.wrapperH = that.wrapper.clientHeight || 1;

        that.minScrollY = -that.options.topOffset || 0;
        that.scrollerW = mround(that.scroller.offsetWidth * that.scale);
        that.scrollerH = mround((that.scroller.offsetHeight + that.minScrollY) * that.scale);
        that.maxScrollX = Math.min(0, that.wrapperW - that.scrollerW);
        that.maxScrollY = Math.min(0, that.wrapperH - that.scrollerH + that.minScrollY);
        that.dirX = 0;
        that.dirY = 0;

        if (that.options.onRefresh) that.options.onRefresh.call(that);

        that.hScroll = that.options.hScroll && that.maxScrollX < 0;
        that.vScroll = that.options.vScroll && (!that.options.bounceLock && !that.hScroll || that.scrollerH > that.wrapperH);

        that.hScrollbar = that.hScroll && that.options.hScrollbar;
        that.vScrollbar = that.vScroll && that.options.vScrollbar && that.scrollerH > that.wrapperH;

        offset = that._offset(that.wrapper);
        that.wrapperOffsetLeft = -offset.left;
        that.wrapperOffsetTop = -offset.top;

        // Prepare snap
        if (typeof that.options.snap == 'string') {
            that.pagesX = [];
            that.pagesY = [];
            els = that.wrapper.querySelectorAll(that.options.snap);
            for (i=0, l=els.length; i<l; i++) {
                pos = that._offset(els[i]);
                pos.left += that.wrapperOffsetLeft;
                pos.top += that.wrapperOffsetTop;
                that.pagesX[i] = pos.left < that.maxScrollX ? that.maxScrollX : pos.left * that.scale;
                that.pagesY[i] = pos.top < that.maxScrollY ? that.maxScrollY : pos.top * that.scale;
            }
        } else if (that.options.snap) {
            that.pagesX = [];
            while (pos >= that.maxScrollX) {
                that.pagesX[page] = pos;
                pos = pos - that.wrapperW;
                page++;
            }
            if (that.maxScrollX%that.wrapperW) that.pagesX[that.pagesX.length] = that.maxScrollX - that.pagesX[that.pagesX.length-1] + that.pagesX[that.pagesX.length-1];

            pos = 0;
            page = 0;
            that.pagesY = [];
            while (pos >= that.maxScrollY) {
                that.pagesY[page] = pos;
                pos = pos - that.wrapperH;
                page++;
            }
            if (that.maxScrollY%that.wrapperH) that.pagesY[that.pagesY.length] = that.maxScrollY - that.pagesY[that.pagesY.length-1] + that.pagesY[that.pagesY.length-1];
        }

        // Prepare the scrollbars
        that._scrollbar('h');
        that._scrollbar('v');

        if (!that.zoomed) {
            that.scroller.style[vendor + 'TransitionDuration'] = '0';
            that._resetPos(200);
        }
    },

    scrollTo: function (x, y, time, relative) {
        var that = this,
            step = x,
            i, l;

        that.stop();

        if (!step.length) step = [{ x: x, y: y, time: time, relative: relative }];
       
        for (i=0, l=step.length; i<l; i++) {
            if (step[i].relative) { step[i].x = that.x - step[i].x; step[i].y = that.y - step[i].y; }
            that.steps.push({ x: step[i].x, y: step[i].y, time: step[i].time || 0 });
        }

        that._startAni();
    },

    scrollToElement: function (el, time) {
        var that = this, pos;
        el = el.nodeType ? el : that.scroller.querySelector(el);
        if (!el) return;

        pos = that._offset(el);
        pos.left += that.wrapperOffsetLeft;
        pos.top += that.wrapperOffsetTop;

        pos.left = pos.left > 0 ? 0 : pos.left < that.maxScrollX ? that.maxScrollX : pos.left;
        pos.top = pos.top > that.minScrollY ? that.minScrollY : pos.top < that.maxScrollY ? that.maxScrollY : pos.top;
        time = time === undefined ? m.max(m.abs(pos.left)*2, m.abs(pos.top)*2) : time;

        that.scrollTo(pos.left, pos.top, time);
    },

    scrollToPage: function (pageX, pageY, time) {
        var that = this, x, y;
       
        time = time === undefined ? 400 : time;

        if (that.options.onScrollStart) that.options.onScrollStart.call(that);

        if (that.options.snap) {
            pageX = pageX == 'next' ? that.currPageX+1 : pageX == 'prev' ? that.currPageX-1 : pageX;
            pageY = pageY == 'next' ? that.currPageY+1 : pageY == 'prev' ? that.currPageY-1 : pageY;

            pageX = pageX < 0 ? 0 : pageX > that.pagesX.length-1 ? that.pagesX.length-1 : pageX;
            pageY = pageY < 0 ? 0 : pageY > that.pagesY.length-1 ? that.pagesY.length-1 : pageY;

            that.currPageX = pageX;
            that.currPageY = pageY;
            x = that.pagesX[pageX];
            y = that.pagesY[pageY];
        } else {
            x = -that.wrapperW * pageX;
            y = -that.wrapperH * pageY;
            if (x < that.maxScrollX) x = that.maxScrollX;
            if (y < that.maxScrollY) y = that.maxScrollY;
        }

        that.scrollTo(x, y, time);
    },

    disable: function () {
        this.stop();
        this._resetPos(0);
        this.enabled = false;

        // If disabled after touchstart we make sure that there are no left over events
        this._unbind(MOVE_EV);
        this._unbind(END_EV);
        this._unbind(CANCEL_EV);
    },
   
    enable: function () {
        this.enabled = true;
    },
   
    stop: function () {
        if (this.options.useTransition) this._unbind('webkitTransitionEnd');
        else cancelFrame(this.aniTime);
        this.steps = [];
        this.moved = false;
        this.animating = false;
    },
   
    zoom: function (x, y, scale, time) {
        var that = this,
            relScale = scale / that.scale;

        if (!that.options.useTransform) return;

        that.zoomed = true;
        time = time === undefined ? 200 : time;
        x = x - that.wrapperOffsetLeft - that.x;
        y = y - that.wrapperOffsetTop - that.y;
        that.x = x - x * relScale + that.x;
        that.y = y - y * relScale + that.y;

        that.scale = scale;
        that.refresh();

        that.x = that.x > 0 ? 0 : that.x < that.maxScrollX ? that.maxScrollX : that.x;
        that.y = that.y > that.minScrollY ? that.minScrollY : that.y < that.maxScrollY ? that.maxScrollY : that.y;

        that.scroller.style[vendor + 'TransitionDuration'] = time + 'ms';
        that.scroller.style[vendor + 'Transform'] = trnOpen + that.x + 'px,' + that.y + 'px' + trnClose + ' scale(' + scale + ')';
        that.zoomed = false;
    },
   
    isReady: function () {
        return !this.moved && !this.zoomed && !this.animating;
    }
};

if (typeof exports !== 'undefined') exports.iScroll = iScroll;
else window.iScroll = iScroll;

})(window.$wall || window.jQuery);

Code (markup):