(function($) {
    $.jScrollPane = {
        active: []
    };
    $.fn.jScrollPane = function(settings) {
        settings = $.extend({},
        $.fn.jScrollPane.defaults, settings);
        var rf = function() {
            return false;
        };
        return this.each(function() {
            var $this = $(this);
            $this.css('overflow', 'hidden');
            var paneEle = this;
            if ($(this).parent().is('.jScrollPaneContainer')) {
                var currentScrollPosition = settings.maintainPosition ? $this.position().top: 0;
                var $c = $(this).parent();
                var paneWidth = $c.innerWidth();
                var paneHeight = $c.outerHeight();
                var trackHeight = paneHeight;
                $('>.jScrollPaneTrack, >.jScrollArrowUp, >.jScrollArrowDown', $c).remove();
                $this.css({
                    'top': 0
                });
            } else {
                var currentScrollPosition = 0;
                this.originalPadding = $this.css('paddingTop') + ' ' + $this.css('paddingRight') + ' ' + $this.css('paddingBottom') + ' ' + $this.css('paddingLeft');
                this.originalSidePaddingTotal = (parseInt($this.css('paddingLeft')) || 0) + (parseInt($this.css('paddingRight')) || 0);
                var paneWidth = $this.innerWidth();
                var paneHeight = 280;
                var trackHeight = paneHeight;
                $this.wrap($('<div></div>').attr({
                    'className': 'jScrollPaneContainer'
                }).css({
                    'height': paneHeight + 'px',
                    'width': paneWidth + 'px'
                }));
                $(document).bind('emchange',
                function(e, cur, prev) {
                    $this.jScrollPane(settings);
                });
            }
            if (settings.reinitialiseOnImageLoad) {
                var $imagesToLoad = $.data(paneEle, 'jScrollPaneImagesToLoad') || $('img', $this);
                var loadedImages = [];
                if ($imagesToLoad.length) {
                    $imagesToLoad.each(function(i, val) {
                        $(this).bind('load',
                        function() {
                            if ($.inArray(i, loadedImages) == -1) {
                                loadedImages.push(val);
                                $imagesToLoad = $.grep($imagesToLoad,
                                function(n, i) {
                                    return n != val;
                                });
                                $.data(paneEle, 'jScrollPaneImagesToLoad', $imagesToLoad);
                                settings.reinitialiseOnImageLoad = false;
                                $this.jScrollPane(settings);
                            }
                        }).each(function(i, val) {
                            if (this.complete || this.complete === undefined) {
                                this.src = this.src;
                            }
                        });
                    });
                };
            }
            var p = 0
			
            var cssToApply = {
                'height': 'auto',
                'width': paneWidth - settings.scrollbarWidth - settings.scrollbarMargin - p + 'px'
            }
            if (settings.scrollbarOnLeft) {
                cssToApply.paddingLeft = settings.scrollbarMargin + settings.scrollbarWidth + 'px';
            } else {
                cssToApply.paddingRight = settings.scrollbarMargin + 'px';
            }
            $this.css(cssToApply);
            var contentHeight = $this.outerHeight();
            var percentInView = paneHeight / contentHeight;
            if (percentInView < .99) {
                var $container = $this.parent();
                $container.append($('<div></div>').attr({
                    'className': 'jScrollPaneTrack'
                }).css({
                    'width': settings.scrollbarWidth + 'px'
                }).append($('<div></div>').attr({
                    'className': 'jScrollPaneDrag'
                }).css({
                    'width': settings.scrollbarWidth + 'px'
                }).append($('<div></div>').attr({
                    'className': 'jScrollPaneDragTop'
                }).css({
                    'width': settings.scrollbarWidth + 'px'
                }), $('<div></div>').attr({
                    'className': 'jScrollPaneDragBottom'
                }).css({
                    'width': settings.scrollbarWidth + 'px'
                }))));
                var $track = $('>.jScrollPaneTrack', $container);
                var $drag = $('>.jScrollPaneTrack .jScrollPaneDrag', $container);
                if (settings.showArrows) {
                    var currentArrowButton;
                    var currentArrowDirection;
                    var currentArrowInterval;
                    var currentArrowInc;
                    var whileArrowButtonDown = function() {
                        if (currentArrowInc > 4 || currentArrowInc % 4 == 0) {
                            positionDrag(dragPosition + currentArrowDirection * mouseWheelMultiplier);
                        }
                        currentArrowInc++;
                    };
                    var onArrowMouseUp = function(event) {
                        $('html').unbind('mouseup', onArrowMouseUp);
                        currentArrowButton.removeClass('jScrollActiveArrowButton');
                        clearInterval(currentArrowInterval);
                    };
                    var onArrowMouseDown = function() {
                        $('html').bind('mouseup', onArrowMouseUp);
                        currentArrowButton.addClass('jScrollActiveArrowButton');
                        currentArrowInc = 0;
                        whileArrowButtonDown();
                        currentArrowInterval = setInterval(whileArrowButtonDown, 100);
                    };
                    $container.append($('<a></a>').attr({
                        'href': 'javascript:;',
                        'className': 'jScrollArrowUp'
                    }).css({
                        'width': settings.scrollbarWidth + 'px'
                    }).html('Scroll up').bind('mousedown',
                    function() {
                        currentArrowButton = $(this);
                        currentArrowDirection = -1;
                        onArrowMouseDown();
                        this.blur();
                        return false;
                    }).bind('click', rf), $('<a></a>').attr({
                        'href': 'javascript:;',
                        'className': 'jScrollArrowDown'
                    }).css({
                        'width': settings.scrollbarWidth + 'px'
                    }).html('Scroll down').bind('mousedown',
                    function() {
                        currentArrowButton = $(this);
                        currentArrowDirection = 1;
                        onArrowMouseDown();
                        this.blur();
                        return false;
                    }).bind('click', rf));
                    var $upArrow = $('>.jScrollArrowUp', $container);
                    var $downArrow = $('>.jScrollArrowDown', $container);
                    if (settings.arrowSize) {
                        trackHeight = paneHeight - settings.arrowSize - settings.arrowSize;
                        $track.css({
                            'height': trackHeight + 'px',
                            top: settings.arrowSize + 'px'
                        })
                    } else {
                        var topArrowHeight = $upArrow.height();
                        settings.arrowSize = topArrowHeight;
                        trackHeight = paneHeight - topArrowHeight - $downArrow.height();
                        $track.css({
                            'height': trackHeight + 'px',
                            top: topArrowHeight + 'px'
                        })
                    }
                }
                var $pane = $(this).css({
                    'position': 'absolute',
                    'overflow': 'visible'
                });
                var currentOffset;
                var maxY;
                var mouseWheelMultiplier;
                var dragPosition = 0;
                var dragMiddle = percentInView * paneHeight / 2;
                var getPos = function(event, c) {
                    var p = c == 'X' ? 'Left': 'Top';
                    return event['page' + c] || (event['client' + c] + (document.documentElement['scroll' + p] || document.body['scroll' + p])) || 0;
                };
                var ignoreNativeDrag = function() {
                    return false;
                };
                var initDrag = function() {
                    ceaseAnimation();
                    currentOffset = $drag.offset(false);
                    currentOffset.top -= dragPosition;
                    maxY = trackHeight - $drag[0].offsetHeight;
                    mouseWheelMultiplier = 2 * settings.wheelSpeed * maxY / contentHeight;
                };
                var onStartDrag = function(event) {
                    initDrag();
                    dragMiddle = getPos(event, 'Y') - dragPosition - currentOffset.top;
                    $('html').bind('mouseup', onStopDrag).bind('mousemove', updateScroll);
                    if ($.browser.msie) {
                        $('html').bind('dragstart', ignoreNativeDrag).bind('selectstart', ignoreNativeDrag);
                    }
                    return false;
                };
                var onStopDrag = function() {
                    $('html').unbind('mouseup', onStopDrag).unbind('mousemove', updateScroll);
                    dragMiddle = percentInView * paneHeight / 2;
                    if ($.browser.msie) {
                        $('html').unbind('dragstart', ignoreNativeDrag).unbind('selectstart', ignoreNativeDrag);
                    }
                };
                var positionDrag = function(destY) {
                    destY = destY < 0 ? 0 : (destY > maxY ? maxY: destY);
                    dragPosition = destY;
                    $drag.css({
                        'top': destY + 'px'
                    });
                    var p = destY / maxY;
                    $pane.css({
                        'top': ((paneHeight - contentHeight) * p) + 'px'
                    });
                    $this.trigger('scroll');
                    if (settings.showArrows) {
                        $upArrow[destY == 0 ? 'addClass': 'removeClass']('disabled');
                        $downArrow[destY == maxY ? 'addClass': 'removeClass']('disabled');
                    }
                };
                var updateScroll = function(e) {
                    positionDrag(getPos(e, 'Y') - currentOffset.top - dragMiddle);
                };
                var dragH = Math.max(Math.min(percentInView * (paneHeight - settings.arrowSize * 2), settings.dragMaxHeight), settings.dragMinHeight);
                $drag.css({
                    'height': dragH + 'px'
                }).bind('mousedown', onStartDrag);
                var trackScrollInterval;
                var trackScrollInc;
                var trackScrollMousePos;
                var doTrackScroll = function() {
                    if (trackScrollInc > 8 || trackScrollInc % 4 == 0) {
                        positionDrag((dragPosition - ((dragPosition - trackScrollMousePos) / 2)));
                    }
                    trackScrollInc++;
                };
                var onStopTrackClick = function() {
                    clearInterval(trackScrollInterval);
                    $('html').unbind('mouseup', onStopTrackClick).unbind('mousemove', onTrackMouseMove);
                };
                var onTrackMouseMove = function(event) {
                    trackScrollMousePos = getPos(event, 'Y') - currentOffset.top - dragMiddle;
                };
                var onTrackClick = function(event) {
                    initDrag();
                    onTrackMouseMove(event);
                    trackScrollInc = 0;
                    $('html').bind('mouseup', onStopTrackClick).bind('mousemove', onTrackMouseMove);
                    trackScrollInterval = setInterval(doTrackScroll, 100);
                    doTrackScroll();
                };
                $track.bind('mousedown', onTrackClick);
                $container.bind('mousewheel',
                function(event, delta) {
                    initDrag();
                    ceaseAnimation();
                    var d = dragPosition;
                    positionDrag(dragPosition - delta * mouseWheelMultiplier);
                    var dragOccured = d != dragPosition;
                    return ! dragOccured;
                });
                var _animateToPosition;
                var _animateToInterval;
                function animateToPosition() {
                    var diff = (_animateToPosition - dragPosition) / settings.animateStep;
                    if (diff > 1 || diff < -1) {
                        positionDrag(dragPosition + diff);
                    } else {
                        positionDrag(_animateToPosition);
                        ceaseAnimation();
                    }
                }
                var ceaseAnimation = function() {
                    if (_animateToInterval) {
                        clearInterval(_animateToInterval);
                        delete _animateToPosition;
                    }
                };
                var scrollTo = function(pos, preventAni) {
                    if (typeof pos == "string") {
                        $e = $(pos, $this);
                        if (!$e.length) return;
                        pos = $e.offset().top - $this.offset().top;
                    }
                    $container.scrollTop(0);
                    ceaseAnimation();
                    var destDragPosition = -pos / (paneHeight - contentHeight) * maxY;
                    if (preventAni || !settings.animateTo) {
                        positionDrag(destDragPosition);
                    } else {
                        _animateToPosition = destDragPosition;
                        _animateToInterval = setInterval(animateToPosition, settings.animateInterval);
                    }
                };
                $this[0].scrollTo = scrollTo;
                $this[0].scrollBy = function(delta) {
                    var currentPos = -parseInt($pane.css('top')) || 0;
                    scrollTo(currentPos + delta);
                };
                initDrag();
                scrollTo( - currentScrollPosition, true);
                $('*', this).bind('focus',
                function(event) {
                    var $e = $(this);
                    var eleTop = 0;
                    while ($e[0] != $this[0]) {
                        eleTop += $e.position().top;
                        $e = $e.offsetParent();
                    }
                    var viewportTop = -parseInt($pane.css('top')) || 0;
                    var maxVisibleEleTop = viewportTop + paneHeight;
                    var eleInView = eleTop > viewportTop && eleTop < maxVisibleEleTop;
                    if (!eleInView) {
                        var destPos = eleTop - settings.scrollbarMargin;
                        if (eleTop > viewportTop) {
                            destPos += $(this).height() + 15 + settings.scrollbarMargin - paneHeight;
                        }
                        scrollTo(destPos);
                    }
                });
				if (location.hash) {
                    scrollTo(location.hash);
                }
                $(document).bind('click',
                function(e) {
                    $target = $(e.target);
                    if ($target.is('a')) {
                        var h = $target.attr('href');
                        if (h.substr(0, 1) == '#') {
                            scrollTo(h);
                        }
                    }
                });
                $.jScrollPane.active.push($this[0]);
            } else {
                $this.css({
                    'height': paneHeight + 'px',
                    'width': paneWidth - this.originalSidePaddingTotal + 'px',
                    'padding': this.originalPadding
                });
                $this.parent().unbind('mousewheel');
            }
        })
    };
    $.fn.jScrollPane.defaults = {
        scrollbarWidth: 40,
        scrollbarMargin: 56,
        wheelSpeed: 18,
        showArrows: false,
        arrowSize: 0,
        animateTo: false,
        dragMinHeight: 1,
        dragMaxHeight: 22,
        animateInterval: 100,
        animateStep: 3,
        maintainPosition: true,
        scrollbarOnLeft: false,
        reinitialiseOnImageLoad: false
    };
    $(window).bind('unload',
    function() {
        var els = $.jScrollPane.active;
        for (var i = 0; i < els.length; i++) {
            els[i].scrollTo = els[i].scrollBy = null;
        }
    });
})(jQuery);
(function($) {
    $.event.special.mousewheel = {
        setup: function() {
            var handler = $.event.special.mousewheel.handler;
            if ($.browser.mozilla) $(this).bind('mousemove.mousewheel',
            function(event) {
                $.data(this, 'mwcursorposdata', {
                    pageX: event.pageX,
                    pageY: event.pageY,
                    clientX: event.clientX,
                    clientY: event.clientY
                });
            });
            if (this.addEventListener) this.addEventListener(($.browser.mozilla ? 'DOMMouseScroll': 'mousewheel'), handler, false);
            else this.onmousewheel = handler;
        },
        teardown: function() {
            var handler = $.event.special.mousewheel.handler;
            $(this).unbind('mousemove.mousewheel');
            if (this.removeEventListener) this.removeEventListener(($.browser.mozilla ? 'DOMMouseScroll': 'mousewheel'), handler, false);
            else this.onmousewheel = function() {};
            $.removeData(this, 'mwcursorposdata');
        },
        handler: function(event) {
            var args = Array.prototype.slice.call(arguments, 1);
            event = $.event.fix(event || window.event);
            $.extend(event, $.data(this, 'mwcursorposdata') || {});
            var delta = 0,
            returnValue = true;
            if (event.wheelDelta) delta = event.wheelDelta / 120;
            if (event.detail) delta = -event.detail / 3;
            event.data = event.data || {};
            event.type = "mousewheel";
            args.unshift(delta);
            args.unshift(event);
            return $.event.handle.apply(this, args);
        }
    };
    $.fn.extend({
        mousewheel: function(fn) {
            return fn ? this.bind("mousewheel", fn) : this.trigger("mousewheel");
        },
        unmousewheel: function(fn) {
            return this.unbind("mousewheel", fn);
        }
    });
	
})(jQuery);