/*!
 * jScrollPane - v2.0.0beta11 - 2011-06-11
 * http://jscrollpane.kelvinluck.com/
 *
 * Copyright (c) 2010 Kelvin Luck
 * Dual licensed under the MIT and GPL licenses.
 */

// Script: jScrollPane - cross browser customisable scrollbars
//
// *Version: 2.0.0beta11, Last updated: 2011-06-11*
//
// Project Home - http://jscrollpane.kelvinluck.com/
// GitHub       - http://github.com/vitch/jScrollPane
// Source       - http://github.com/vitch/jScrollPane/raw/master/script/jquery.jscrollpane.js
// (Minified)   - http://github.com/vitch/jScrollPane/raw/master/script/jquery.jscrollpane.min.js
//
// About: License
//
// Copyright (c) 2011 Kelvin Luck
// Dual licensed under the MIT or GPL Version 2 licenses.
// http://jscrollpane.kelvinluck.com/MIT-LICENSE.txt
// http://jscrollpane.kelvinluck.com/GPL-LICENSE.txt
//
// About: Examples
//
// All examples and demos are available through the jScrollPane example site at:
// http://jscrollpane.kelvinluck.com/
//
// About: Support and Testing
//
// This plugin is tested on the browsers below and has been found to work reliably on them. If you run
// into a problem on one of the supported browsers then please visit the support section on the jScrollPane
// website (http://jscrollpane.kelvinluck.com/) for more information on getting support. You are also
// welcome to fork the project on GitHub if you can contribute a fix for a given issue. 
//
// jQuery Versions - tested in 1.4.2+ - reported to work in 1.3.x
// Browsers Tested - Firefox 3.6.8, Safari 5, Opera 10.6, Chrome 5.0, IE 6, 7, 8
//
// About: Release History
//
// 2.0.0beta11 - (in progress) 
// 2.0.0beta10 - (2011-04-17) cleaner required size calculation, improved keyboard support, stickToBottom/Left, other small fixes
// 2.0.0beta9 - (2011-01-31) new API methods, bug fixes and correct keyboard support for FF/OSX
// 2.0.0beta8 - (2011-01-29) touchscreen support, improved keyboard support
// 2.0.0beta7 - (2011-01-23) scroll speed consistent (thanks Aivo Paas)
// 2.0.0beta6 - (2010-12-07) scrollToElement horizontal support
// 2.0.0beta5 - (2010-10-18) jQuery 1.4.3 support, various bug fixes
// 2.0.0beta4 - (2010-09-17) clickOnTrack support, bug fixes
// 2.0.0beta3 - (2010-08-27) Horizontal mousewheel, mwheelIntent, keyboard support, bug fixes
// 2.0.0beta2 - (2010-08-21) Bug fixes
// 2.0.0beta1 - (2010-08-17) Rewrite to follow modern best practices and enable horizontal scrolling, initially hidden
//							 elements and dynamically sized elements.
// 1.x - (2006-12-31 - 2010-07-31) Initial version, hosted at googlecode, deprecated

(function($,window,undefined){

    $.fn.jScrollPane = function(settings)
    {
        // JScrollPane "class" - public methods are available through $('selector').data('jsp')
        function JScrollPane(elem, s)
        {
            var settings, jsp = this, pane, paneWidth, paneHeight, container, contentWidth, contentHeight,
                percentInViewH, percentInViewV, isScrollableV, isScrollableH, verticalDrag, dragMaxY,
                verticalDragPosition, horizontalDrag, dragMaxX, horizontalDragPosition,
                verticalBar, verticalTrack, scrollbarWidth, verticalTrackHeight, verticalDragHeight, arrowUp, arrowDown,
                horizontalBar, horizontalTrack, horizontalTrackWidth, horizontalDragWidth, arrowLeft, arrowRight,
                reinitialiseInterval, originalPadding, originalPaddingTotalWidth, previousContentWidth,
                wasAtTop = true, wasAtLeft = true, wasAtBottom = false, wasAtRight = false,
                originalElement = elem.clone(false, false).empty(),
                mwEvent = $.fn.mwheelIntent ? 'mwheelIntent.jsp' : 'mousewheel.jsp';

            originalPadding = elem.css('paddingTop') + ' ' +
                elem.css('paddingRight') + ' ' +
                elem.css('paddingBottom') + ' ' +
                elem.css('paddingLeft');
            originalPaddingTotalWidth = (parseInt(elem.css('paddingLeft'), 10) || 0) +
                (parseInt(elem.css('paddingRight'), 10) || 0);

            function initialise(s)
            {

                var /*firstChild, lastChild, */isMaintainingPositon, lastContentX, lastContentY,
                    hasContainingSpaceChanged, originalScrollTop, originalScrollLeft,
                    maintainAtBottom = false, maintainAtRight = false;

                settings = s;

                if (pane === undefined) {
                    originalScrollTop = elem.scrollTop();
                    originalScrollLeft = elem.scrollLeft();

                    elem.css(
                        {
                            overflow: 'hidden',
                            padding: 0
                        }
                    );
                    // TODO: Deal with where width/ height is 0 as it probably means the element is hidden and we should
                    // come back to it later and check once it is unhidden...
                    paneWidth = elem.innerWidth() + originalPaddingTotalWidth;
                    paneHeight = elem.innerHeight();

                    elem.width(paneWidth);

                    pane = $('<div class="jspPane" />').css('padding', originalPadding).append(elem.children());
                    container = $('<div class="jspContainer" />')
                        .css({
                            'width': paneWidth + 'px',
                            'height': paneHeight + 'px'
                        }
                    ).append(pane).appendTo(elem);

                    /*
                     // Move any margins from the first and last children up to the container so they can still
                     // collapse with neighbouring elements as they would before jScrollPane
                     firstChild = pane.find(':first-child');
                     lastChild = pane.find(':last-child');
                     elem.css(
                     {
                     'margin-top': firstChild.css('margin-top'),
                     'margin-bottom': lastChild.css('margin-bottom')
                     }
                     );
                     firstChild.css('margin-top', 0);
                     lastChild.css('margin-bottom', 0);
                     */
                } else {
                    elem.css('width', '');

                    maintainAtBottom = settings.stickToBottom && isCloseToBottom();
                    maintainAtRight  = settings.stickToRight  && isCloseToRight();

                    hasContainingSpaceChanged = elem.innerWidth() + originalPaddingTotalWidth != paneWidth || elem.outerHeight() != paneHeight;

                    if (hasContainingSpaceChanged) {
                        paneWidth = elem.innerWidth() + originalPaddingTotalWidth;
                        paneHeight = elem.innerHeight();
                        container.css({
                            width: paneWidth + 'px',
                            height: paneHeight + 'px'
                        });
                    }

                    // If nothing changed since last check...
                    if (!hasContainingSpaceChanged && previousContentWidth == contentWidth && pane.outerHeight() == contentHeight) {
                        elem.width(paneWidth);
                        return;
                    }
                    previousContentWidth = contentWidth;

                    pane.css('width', '');
                    elem.width(paneWidth);

                    container.find('>.jspVerticalBar,>.jspHorizontalBar').remove().end();
                }

                pane.css('overflow', 'auto');
                if (s.contentWidth) {
                    contentWidth = s.contentWidth;
                } else {
                    contentWidth = pane[0].scrollWidth;
                }
                contentHeight = pane[0].scrollHeight;
                pane.css('overflow', '');

                percentInViewH = contentWidth / paneWidth;
                percentInViewV = contentHeight / paneHeight;
                isScrollableV = percentInViewV > 1;

                isScrollableH = percentInViewH > 1;

                //console.log(paneWidth, paneHeight, contentWidth, contentHeight, percentInViewH, percentInViewV, isScrollableH, isScrollableV);

                if (!(isScrollableH || isScrollableV)) {
                    elem.removeClass('jspScrollable');
                    pane.css({
                        top: 0,
                        width: container.width() - originalPaddingTotalWidth
                    });
                    removeMousewheel();
                    removeFocusHandler();
                    removeKeyboardNav();
                    removeClickOnTrack();
                    unhijackInternalLinks();
                } else {
                    elem.addClass('jspScrollable');

                    isMaintainingPositon = settings.maintainPosition && (verticalDragPosition || horizontalDragPosition);
                    if (isMaintainingPositon) {
                        lastContentX = contentPositionX();
                        lastContentY = contentPositionY();
                    }

                    initialiseVerticalScroll();
                    initialiseHorizontalScroll();
                    resizeScrollbars();

                    if (isMaintainingPositon) {
                        scrollToX(maintainAtRight  ? (contentWidth  - paneWidth ) : lastContentX, false);
                        scrollToY(maintainAtBottom ? (contentHeight - paneHeight) : lastContentY, false);
                    }

                    initFocusHandler();
                    initMousewheel();
                    initTouch();

                    if (settings.enableKeyboardNavigation) {
                        initKeyboardNav();
                    }
                    if (settings.clickOnTrack) {
                        initClickOnTrack();
                    }

                    observeHash();
                    if (settings.hijackInternalLinks) {
                        hijackInternalLinks();
                    }
                }

                if (settings.autoReinitialise && !reinitialiseInterval) {
                    reinitialiseInterval = setInterval(
                        function()
                        {
                            initialise(settings);
                        },
                        settings.autoReinitialiseDelay
                    );
                } else if (!settings.autoReinitialise && reinitialiseInterval) {
                    clearInterval(reinitialiseInterval);
                }

                originalScrollTop && elem.scrollTop(0) && scrollToY(originalScrollTop, false);
                originalScrollLeft && elem.scrollLeft(0) && scrollToX(originalScrollLeft, false);

                elem.trigger('jsp-initialised', [isScrollableH || isScrollableV]);
            }

            function initialiseVerticalScroll()
            {
                if (isScrollableV) {

                    container.append(
                        $('<div class="jspVerticalBar" />').append(
                            $('<div class="jspCap jspCapTop" />'),
                            $('<div class="jspTrack" />').append(
                                $('<div class="jspDrag" />').append(
                                    $('<div class="jspDragTop" />'),
                                    $('<div class="jspDragBottom" />')
                                )
                            ),
                            $('<div class="jspCap jspCapBottom" />')
                        )
                    );

                    verticalBar = container.find('>.jspVerticalBar');
                    verticalTrack = verticalBar.find('>.jspTrack');
                    verticalDrag = verticalTrack.find('>.jspDrag');

                    if (settings.showArrows) {
                        arrowUp = $('<a class="jspArrow jspArrowUp" />').bind(
                            'mousedown.jsp', getArrowScroll(0, -1)
                        ).bind('click.jsp', nil);
                        arrowDown = $('<a class="jspArrow jspArrowDown" />').bind(
                            'mousedown.jsp', getArrowScroll(0, 1)
                        ).bind('click.jsp', nil);
                        if (settings.arrowScrollOnHover) {
                            arrowUp.bind('mouseover.jsp', getArrowScroll(0, -1, arrowUp));
                            arrowDown.bind('mouseover.jsp', getArrowScroll(0, 1, arrowDown));
                        }

                        appendArrows(verticalTrack, settings.verticalArrowPositions, arrowUp, arrowDown);
                    }

                    verticalTrackHeight = paneHeight;
                    container.find('>.jspVerticalBar>.jspCap:visible,>.jspVerticalBar>.jspArrow').each(
                        function()
                        {
                            verticalTrackHeight -= $(this).outerHeight();
                        }
                    );


                    verticalDrag.hover(
                        function()
                        {
                            verticalDrag.addClass('jspHover');
                        },
                        function()
                        {
                            verticalDrag.removeClass('jspHover');
                        }
                    ).bind(
                        'mousedown.jsp',
                        function(e)
                        {
                            // Stop IE from allowing text selection
                            $('html').bind('dragstart.jsp selectstart.jsp', nil);

                            verticalDrag.addClass('jspActive');

                            var startY = e.pageY - verticalDrag.position().top;

                            $('html').bind(
                                'mousemove.jsp',
                                function(e)
                                {
                                    positionDragY(e.pageY - startY, false);
                                }
                            ).bind('mouseup.jsp mouseleave.jsp', cancelDrag);
                            return false;
                        }
                    );
                    sizeVerticalScrollbar();
                }
            }

            function sizeVerticalScrollbar()
            {
                verticalTrack.height(verticalTrackHeight + 'px');
                verticalDragPosition = 0;
                scrollbarWidth = settings.verticalGutter + verticalTrack.outerWidth();

                // Make the pane thinner to allow for the vertical scrollbar
                pane.width(paneWidth - scrollbarWidth - originalPaddingTotalWidth);

                // Add margin to the left of the pane if scrollbars are on that side (to position
                // the scrollbar on the left or right set it's left or right property in CSS)
                try {
                    if (verticalBar.position().left === 0) {
                        pane.css('margin-left', scrollbarWidth + 'px');
                    }
                } catch (err) {
                }
            }

            function initialiseHorizontalScroll()
            {
                if (isScrollableH) {

                    container.append(
                        $('<div class="jspHorizontalBar" />').append(
                            $('<div class="jspCap jspCapLeft" />'),
                            $('<div class="jspTrack" />').append(
                                $('<div class="jspDrag" />').append(
                                    $('<div class="jspDragLeft" />'),
                                    $('<div class="jspDragRight" />')
                                )
                            ),
                            $('<div class="jspCap jspCapRight" />')
                        )
                    );

                    horizontalBar = container.find('>.jspHorizontalBar');
                    horizontalTrack = horizontalBar.find('>.jspTrack');
                    horizontalDrag = horizontalTrack.find('>.jspDrag');

                    if (settings.showArrows) {
                        arrowLeft = $('<a class="jspArrow jspArrowLeft" />').bind(
                            'mousedown.jsp', getArrowScroll(-1, 0)
                        ).bind('click.jsp', nil);
                        arrowRight = $('<a class="jspArrow jspArrowRight" />').bind(
                            'mousedown.jsp', getArrowScroll(1, 0)
                        ).bind('click.jsp', nil);
                        if (settings.arrowScrollOnHover) {
                            arrowLeft.bind('mouseover.jsp', getArrowScroll(-1, 0, arrowLeft));
                            arrowRight.bind('mouseover.jsp', getArrowScroll(1, 0, arrowRight));
                        }
                        appendArrows(horizontalTrack, settings.horizontalArrowPositions, arrowLeft, arrowRight);
                    }

                    horizontalDrag.hover(
                        function()
                        {
                            horizontalDrag.addClass('jspHover');
                        },
                        function()
                        {
                            horizontalDrag.removeClass('jspHover');
                        }
                    ).bind(
                        'mousedown.jsp',
                        function(e)
                        {
                            // Stop IE from allowing text selection
                            $('html').bind('dragstart.jsp selectstart.jsp', nil);

                            horizontalDrag.addClass('jspActive');

                            var startX = e.pageX - horizontalDrag.position().left;

                            $('html').bind(
                                'mousemove.jsp',
                                function(e)
                                {
                                    positionDragX(e.pageX - startX, false);
                                }
                            ).bind('mouseup.jsp mouseleave.jsp', cancelDrag);
                            return false;
                        }
                    );
                    horizontalTrackWidth = container.innerWidth();
                    sizeHorizontalScrollbar();
                }
            }

            function sizeHorizontalScrollbar()
            {
                container.find('>.jspHorizontalBar>.jspCap:visible,>.jspHorizontalBar>.jspArrow').each(
                    function()
                    {
                        horizontalTrackWidth -= $(this).outerWidth();
                    }
                );

                horizontalTrack.width(horizontalTrackWidth + 'px');
                horizontalDragPosition = 0;
            }

            function resizeScrollbars()
            {
                if (isScrollableH && isScrollableV) {
                    var horizontalTrackHeight = horizontalTrack.outerHeight(),
                        verticalTrackWidth = verticalTrack.outerWidth();
                    verticalTrackHeight -= horizontalTrackHeight;
                    $(horizontalBar).find('>.jspCap:visible,>.jspArrow').each(
                        function()
                        {
                            horizontalTrackWidth += $(this).outerWidth();
                        }
                    );
                    horizontalTrackWidth -= verticalTrackWidth;
                    paneHeight -= verticalTrackWidth;
                    paneWidth -= horizontalTrackHeight;
                    horizontalTrack.parent().append(
                        $('<div class="jspCorner" />').css('width', horizontalTrackHeight + 'px')
                    );
                    sizeVerticalScrollbar();
                    sizeHorizontalScrollbar();
                }
                // reflow content
                if (isScrollableH) {
                    pane.width((container.outerWidth() - originalPaddingTotalWidth) + 'px');
                }
                contentHeight = pane.outerHeight();
                percentInViewV = contentHeight / paneHeight;

                if (isScrollableH) {
                    horizontalDragWidth = Math.ceil(1 / percentInViewH * horizontalTrackWidth);
                    if (horizontalDragWidth > settings.horizontalDragMaxWidth) {
                        horizontalDragWidth = settings.horizontalDragMaxWidth;
                    } else if (horizontalDragWidth < settings.horizontalDragMinWidth) {
                        horizontalDragWidth = settings.horizontalDragMinWidth;
                    }
                    horizontalDrag.width(horizontalDragWidth + 'px');
                    dragMaxX = horizontalTrackWidth - horizontalDragWidth;
                    _positionDragX(horizontalDragPosition); // To update the state for the arrow buttons
                }
                if (isScrollableV) {
                    verticalDragHeight = Math.ceil(1 / percentInViewV * verticalTrackHeight);
                    if (verticalDragHeight > settings.verticalDragMaxHeight) {
                        verticalDragHeight = settings.verticalDragMaxHeight;
                    } else if (verticalDragHeight < settings.verticalDragMinHeight) {
                        verticalDragHeight = settings.verticalDragMinHeight;
                    }
                    verticalDrag.height(verticalDragHeight + 'px');
                    dragMaxY = verticalTrackHeight - verticalDragHeight;
                    _positionDragY(verticalDragPosition); // To update the state for the arrow buttons
                }
            }

            function appendArrows(ele, p, a1, a2)
            {
                var p1 = "before", p2 = "after", aTemp;

                // Sniff for mac... Is there a better way to determine whether the arrows would naturally appear
                // at the top or the bottom of the bar?
                if (p == "os") {
                    p = /Mac/.test(navigator.platform) ? "after" : "split";
                }
                if (p == p1) {
                    p2 = p;
                } else if (p == p2) {
                    p1 = p;
                    aTemp = a1;
                    a1 = a2;
                    a2 = aTemp;
                }

                ele[p1](a1)[p2](a2);
            }

            function getArrowScroll(dirX, dirY, ele)
            {
                return function()
                {
                    arrowScroll(dirX, dirY, this, ele);
                    this.blur();
                    return false;
                };
            }

            function arrowScroll(dirX, dirY, arrow, ele)
            {
                arrow = $(arrow).addClass('jspActive');

                var eve,
                    scrollTimeout,
                    isFirst = true,
                    doScroll = function()
                    {
                        if (dirX !== 0) {
                            jsp.scrollByX(dirX * settings.arrowButtonSpeed);
                        }
                        if (dirY !== 0) {
                            jsp.scrollByY(dirY * settings.arrowButtonSpeed);
                        }
                        scrollTimeout = setTimeout(doScroll, isFirst ? settings.initialDelay : settings.arrowRepeatFreq);
                        isFirst = false;
                    };

                doScroll();

                eve = ele ? 'mouseout.jsp' : 'mouseup.jsp';
                ele = ele || $('html');
                ele.bind(
                    eve,
                    function()
                    {
                        arrow.removeClass('jspActive');
                        scrollTimeout && clearTimeout(scrollTimeout);
                        scrollTimeout = null;
                        ele.unbind(eve);
                    }
                );
            }

            function initClickOnTrack()
            {
                removeClickOnTrack();
                if (isScrollableV) {
                    verticalTrack.bind(
                        'mousedown.jsp',
                        function(e)
                        {
                            if (e.originalTarget === undefined || e.originalTarget == e.currentTarget) {
                                var clickedTrack = $(this),
                                    offset = clickedTrack.offset(),
                                    direction = e.pageY - offset.top - verticalDragPosition,
                                    scrollTimeout,
                                    isFirst = true,
                                    doScroll = function()
                                    {
                                        var offset = clickedTrack.offset(),
                                            pos = e.pageY - offset.top - verticalDragHeight / 2,
                                            contentDragY = paneHeight * settings.scrollPagePercent,
                                            dragY = dragMaxY * contentDragY / (contentHeight - paneHeight);
                                        if (direction < 0) {
                                            if (verticalDragPosition - dragY > pos) {
                                                jsp.scrollByY(-contentDragY);
                                            } else {
                                                positionDragY(pos);
                                            }
                                        } else if (direction > 0) {
                                            if (verticalDragPosition + dragY < pos) {
                                                jsp.scrollByY(contentDragY);
                                            } else {
                                                positionDragY(pos);
                                            }
                                        } else {
                                            cancelClick();
                                            return;
                                        }
                                        scrollTimeout = setTimeout(doScroll, isFirst ? settings.initialDelay : settings.trackClickRepeatFreq);
                                        isFirst = false;
                                    },
                                    cancelClick = function()
                                    {
                                        scrollTimeout && clearTimeout(scrollTimeout);
                                        scrollTimeout = null;
                                        $(document).unbind('mouseup.jsp', cancelClick);
                                    };
                                doScroll();
                                $(document).bind('mouseup.jsp', cancelClick);
                                return false;
                            }
                        }
                    );
                }

                if (isScrollableH) {
                    horizontalTrack.bind(
                        'mousedown.jsp',
                        function(e)
                        {
                            if (e.originalTarget === undefined || e.originalTarget == e.currentTarget) {
                                var clickedTrack = $(this),
                                    offset = clickedTrack.offset(),
                                    direction = e.pageX - offset.left - horizontalDragPosition,
                                    scrollTimeout,
                                    isFirst = true,
                                    doScroll = function()
                                    {
                                        var offset = clickedTrack.offset(),
                                            pos = e.pageX - offset.left - horizontalDragWidth / 2,
                                            contentDragX = paneWidth * settings.scrollPagePercent,
                                            dragX = dragMaxX * contentDragX / (contentWidth - paneWidth);
                                        if (direction < 0) {
                                            if (horizontalDragPosition - dragX > pos) {
                                                jsp.scrollByX(-contentDragX);
                                            } else {
                                                positionDragX(pos);
                                            }
                                        } else if (direction > 0) {
                                            if (horizontalDragPosition + dragX < pos) {
                                                jsp.scrollByX(contentDragX);
                                            } else {
                                                positionDragX(pos);
                                            }
                                        } else {
                                            cancelClick();
                                            return;
                                        }
                                        scrollTimeout = setTimeout(doScroll, isFirst ? settings.initialDelay : settings.trackClickRepeatFreq);
                                        isFirst = false;
                                    },
                                    cancelClick = function()
                                    {
                                        scrollTimeout && clearTimeout(scrollTimeout);
                                        scrollTimeout = null;
                                        $(document).unbind('mouseup.jsp', cancelClick);
                                    };
                                doScroll();
                                $(document).bind('mouseup.jsp', cancelClick);
                                return false;
                            }
                        }
                    );
                }
            }

            function removeClickOnTrack()
            {
                if (horizontalTrack) {
                    horizontalTrack.unbind('mousedown.jsp');
                }
                if (verticalTrack) {
                    verticalTrack.unbind('mousedown.jsp');
                }
            }

            function cancelDrag()
            {
                $('html').unbind('dragstart.jsp selectstart.jsp mousemove.jsp mouseup.jsp mouseleave.jsp');

                if (verticalDrag) {
                    verticalDrag.removeClass('jspActive');
                }
                if (horizontalDrag) {
                    horizontalDrag.removeClass('jspActive');
                }
            }

            function positionDragY(destY, animate)
            {
                if (!isScrollableV) {
                    return;
                }
                if (destY < 0) {
                    destY = 0;
                } else if (destY > dragMaxY) {
                    destY = dragMaxY;
                }

                // can't just check if(animate) because false is a valid value that could be passed in...
                if (animate === undefined) {
                    animate = settings.animateScroll;
                }
                if (animate) {
                    jsp.animate(verticalDrag, 'top', destY,	_positionDragY);
                } else {
                    verticalDrag.css('top', destY);
                    _positionDragY(destY);
                }

            }

            function _positionDragY(destY)
            {
                if (destY === undefined) {
                    destY = verticalDrag.position().top;
                }

                container.scrollTop(0);
                verticalDragPosition = destY;

                var isAtTop = verticalDragPosition === 0,
                    isAtBottom = verticalDragPosition == dragMaxY,
                    percentScrolled = destY/ dragMaxY,
                    destTop = -percentScrolled * (contentHeight - paneHeight);

                if (wasAtTop != isAtTop || wasAtBottom != isAtBottom) {
                    wasAtTop = isAtTop;
                    wasAtBottom = isAtBottom;
                    elem.trigger('jsp-arrow-change', [wasAtTop, wasAtBottom, wasAtLeft, wasAtRight]);
                }

                updateVerticalArrows(isAtTop, isAtBottom);
                pane.css('top', destTop);
                elem.trigger('jsp-scroll-y', [-destTop, isAtTop, isAtBottom]).trigger('scroll');
            }

            function positionDragX(destX, animate)
            {
                if (!isScrollableH) {
                    return;
                }
                if (destX < 0) {
                    destX = 0;
                } else if (destX > dragMaxX) {
                    destX = dragMaxX;
                }

                if (animate === undefined) {
                    animate = settings.animateScroll;
                }
                if (animate) {
                    jsp.animate(horizontalDrag, 'left', destX,	_positionDragX);
                } else {
                    horizontalDrag.css('left', destX);
                    _positionDragX(destX);
                }
            }

            function _positionDragX(destX)
            {
                if (destX === undefined) {
                    destX = horizontalDrag.position().left;
                }

                container.scrollTop(0);
                horizontalDragPosition = destX;

                var isAtLeft = horizontalDragPosition === 0,
                    isAtRight = horizontalDragPosition == dragMaxX,
                    percentScrolled = destX / dragMaxX,
                    destLeft = -percentScrolled * (contentWidth - paneWidth);

                if (wasAtLeft != isAtLeft || wasAtRight != isAtRight) {
                    wasAtLeft = isAtLeft;
                    wasAtRight = isAtRight;
                    elem.trigger('jsp-arrow-change', [wasAtTop, wasAtBottom, wasAtLeft, wasAtRight]);
                }

                updateHorizontalArrows(isAtLeft, isAtRight);
                pane.css('left', destLeft);
                elem.trigger('jsp-scroll-x', [-destLeft, isAtLeft, isAtRight]).trigger('scroll');
            }

            function updateVerticalArrows(isAtTop, isAtBottom)
            {
                if (settings.showArrows) {
                    arrowUp[isAtTop ? 'addClass' : 'removeClass']('jspDisabled');
                    arrowDown[isAtBottom ? 'addClass' : 'removeClass']('jspDisabled');
                }
            }

            function updateHorizontalArrows(isAtLeft, isAtRight)
            {
                if (settings.showArrows) {
                    arrowLeft[isAtLeft ? 'addClass' : 'removeClass']('jspDisabled');
                    arrowRight[isAtRight ? 'addClass' : 'removeClass']('jspDisabled');
                }
            }

            function scrollToY(destY, animate)
            {
                var percentScrolled = destY / (contentHeight - paneHeight);
                positionDragY(percentScrolled * dragMaxY, animate);
            }

            function scrollToX(destX, animate)
            {
                var percentScrolled = destX / (contentWidth - paneWidth);
                positionDragX(percentScrolled * dragMaxX, animate);
            }

            function scrollToElement(ele, stickToTop, animate)
            {
                var e, eleHeight, eleWidth, eleTop = 0, eleLeft = 0, viewportTop, viewportLeft, maxVisibleEleTop, maxVisibleEleLeft, destY, destX;

                // Legal hash values aren't necessarily legal jQuery selectors so we need to catch any
                // errors from the lookup...
                try {
                    e = $(ele);
                } catch (err) {
                    return;
                }
                eleHeight = e.outerHeight();
                eleWidth= e.outerWidth();

                container.scrollTop(0);
                container.scrollLeft(0);

                // loop through parents adding the offset top of any elements that are relatively positioned between
                // the focused element and the jspPane so we can get the true distance from the top
                // of the focused element to the top of the scrollpane...
                while (!e.is('.jspPane')) {
                    eleTop += e.position().top;
                    eleLeft += e.position().left;
                    e = e.offsetParent();
                    if (/^body|html$/i.test(e[0].nodeName)) {
                        // we ended up too high in the document structure. Quit!
                        return;
                    }
                }

                viewportTop = contentPositionY();
                maxVisibleEleTop = viewportTop + paneHeight;
                if (eleTop < viewportTop || stickToTop) { // element is above viewport
                    destY = eleTop - settings.verticalGutter;
                } else if (eleTop + eleHeight > maxVisibleEleTop) { // element is below viewport
                    destY = eleTop - paneHeight + eleHeight + settings.verticalGutter;
                }
                if (destY) {
                    scrollToY(destY, animate);
                }

                viewportLeft = contentPositionX();
                maxVisibleEleLeft = viewportLeft + paneWidth;
                if (eleLeft < viewportLeft || stickToTop) { // element is to the left of viewport
                    destX = eleLeft - settings.horizontalGutter;
                } else if (eleLeft + eleWidth > maxVisibleEleLeft) { // element is to the right viewport
                    destX = eleLeft - paneWidth + eleWidth + settings.horizontalGutter;
                }
                if (destX) {
                    scrollToX(destX, animate);
                }

            }

            function contentPositionX()
            {
                return -pane.position().left;
            }

            function contentPositionY()
            {
                return -pane.position().top;
            }

            function isCloseToBottom()
            {
                var scrollableHeight = contentHeight - paneHeight;
                return (scrollableHeight > 20) && (scrollableHeight - contentPositionY() < 10);
            }

            function isCloseToRight()
            {
                var scrollableWidth = contentWidth - paneWidth;
                return (scrollableWidth > 20) && (scrollableWidth - contentPositionX() < 10);
            }

            function initMousewheel()
            {
                container.unbind(mwEvent).bind(
                    mwEvent,
                    function (event, delta, deltaX, deltaY) {
                        var dX = horizontalDragPosition, dY = verticalDragPosition;
                        jsp.scrollBy(deltaX * settings.mouseWheelSpeed, -deltaY * settings.mouseWheelSpeed, false);
                        // return true if there was no movement so rest of screen can scroll
                        return dX == horizontalDragPosition && dY == verticalDragPosition;
                    }
                );
            }

            function removeMousewheel()
            {
                container.unbind(mwEvent);
            }

            function nil()
            {
                return false;
            }

            function initFocusHandler()
            {
                pane.find(':input,a').unbind('focus.jsp').bind(
                    'focus.jsp',
                    function(e)
                    {
                        scrollToElement(e.target, false);
                    }
                );
            }

            function removeFocusHandler()
            {
                pane.find(':input,a').unbind('focus.jsp');
            }

            function initKeyboardNav()
            {
                var keyDown, elementHasScrolled, validParents = [];
                isScrollableH && validParents.push(horizontalBar[0]);
                isScrollableV && validParents.push(verticalBar[0]);

                // IE also focuses elements that don't have tabindex set.
                pane.focus(
                    function()
                    {
                        elem.focus();
                    }
                );

                elem.attr('tabindex', 0)
                    .unbind('keydown.jsp keypress.jsp')
                    .bind(
                    'keydown.jsp',
                    function(e)
                    {
                        if (e.target !== this && !(validParents.length && $(e.target).closest(validParents).length)){
                            return;
                        }
                        var dX = horizontalDragPosition, dY = verticalDragPosition;
                        switch(e.keyCode) {
                            case 40: // down
                            case 38: // up
                            case 34: // page down
                            case 32: // space
                            case 33: // page up
                            case 39: // right
                            case 37: // left
                                keyDown = e.keyCode;
                                keyDownHandler();
                                break;
                            case 35: // end
                                scrollToY(contentHeight - paneHeight);
                                keyDown = null;
                                break;
                            case 36: // home
                                scrollToY(0);
                                keyDown = null;
                                break;
                        }

                        elementHasScrolled = e.keyCode == keyDown && dX != horizontalDragPosition || dY != verticalDragPosition;
                        return !elementHasScrolled;
                    }
                ).bind(
                    'keypress.jsp', // For FF/ OSX so that we can cancel the repeat key presses if the JSP scrolls...
                    function(e)
                    {
                        if (e.keyCode == keyDown) {
                            keyDownHandler();
                        }
                        return !elementHasScrolled;
                    }
                );

                if (settings.hideFocus) {
                    elem.css('outline', 'none');
                    if ('hideFocus' in container[0]){
                        elem.attr('hideFocus', true);
                    }
                } else {
                    elem.css('outline', '');
                    if ('hideFocus' in container[0]){
                        elem.attr('hideFocus', false);
                    }
                }

                function keyDownHandler()
                {
                    var dX = horizontalDragPosition, dY = verticalDragPosition;
                    switch(keyDown) {
                        case 40: // down
                            jsp.scrollByY(settings.keyboardSpeed, false);
                            break;
                        case 38: // up
                            jsp.scrollByY(-settings.keyboardSpeed, false);
                            break;
                        case 34: // page down
                        case 32: // space
                            jsp.scrollByY(paneHeight * settings.scrollPagePercent, false);
                            break;
                        case 33: // page up
                            jsp.scrollByY(-paneHeight * settings.scrollPagePercent, false);
                            break;
                        case 39: // right
                            jsp.scrollByX(settings.keyboardSpeed, false);
                            break;
                        case 37: // left
                            jsp.scrollByX(-settings.keyboardSpeed, false);
                            break;
                    }

                    elementHasScrolled = dX != horizontalDragPosition || dY != verticalDragPosition;
                    return elementHasScrolled;
                }
            }

            function removeKeyboardNav()
            {
                elem.attr('tabindex', '-1')
                    .removeAttr('tabindex')
                    .unbind('keydown.jsp keypress.jsp');
            }

            function observeHash()
            {
                if (location.hash && location.hash.length > 1) {
                    var e,
                        retryInt,
                        hash = escape(location.hash) // hash must be escaped to prevent XSS
                        ;
                    try {
                        e = $(hash);
                    } catch (err) {
                        return;
                    }

                    if (e.length && pane.find(hash)) {
                        // nasty workaround but it appears to take a little while before the hash has done its thing
                        // to the rendered page so we just wait until the container's scrollTop has been messed up.
                        if (container.scrollTop() === 0) {
                            retryInt = setInterval(
                                function()
                                {
                                    if (container.scrollTop() > 0) {
                                        scrollToElement(hash, true);
                                        $(document).scrollTop(container.position().top);
                                        clearInterval(retryInt);
                                    }
                                },
                                50
                            );
                        } else {
                            scrollToElement(hash, true);
                            $(document).scrollTop(container.position().top);
                        }
                    }
                }
            }

            function unhijackInternalLinks()
            {
                $('a.jspHijack').unbind('click.jsp-hijack').removeClass('jspHijack');
            }

            function hijackInternalLinks()
            {
                unhijackInternalLinks();
                $('a[href^=#]').addClass('jspHijack').bind(
                    'click.jsp-hijack',
                    function()
                    {
                        var uriParts = this.href.split('#'), hash;
                        if (uriParts.length > 1) {
                            hash = uriParts[1];
                            if (hash.length > 0 && pane.find('#' + hash).length > 0) {
                                scrollToElement('#' + hash, true);
                                // Need to return false otherwise things mess up... Would be nice to maybe also scroll
                                // the window to the top of the scrollpane?
                                return false;
                            }
                        }
                    }
                );
            }

            // Init touch on iPad, iPhone, iPod, Android
            function initTouch()
            {
                var startX,
                    startY,
                    touchStartX,
                    touchStartY,
                    moved,
                    moving = false;

                container.unbind('touchstart.jsp touchmove.jsp touchend.jsp click.jsp-touchclick').bind(
                    'touchstart.jsp',
                    function(e)
                    {
                        var touch = e.originalEvent.touches[0];
                        startX = contentPositionX();
                        startY = contentPositionY();
                        touchStartX = touch.pageX;
                        touchStartY = touch.pageY;
                        moved = false;
                        moving = true;
                    }
                ).bind(
                    'touchmove.jsp',
                    function(ev)
                    {
                        if(!moving) {
                            return;
                        }

                        var touchPos = ev.originalEvent.touches[0],
                            dX = horizontalDragPosition, dY = verticalDragPosition;

                        jsp.scrollTo(startX + touchStartX - touchPos.pageX, startY + touchStartY - touchPos.pageY);

                        moved = moved || Math.abs(touchStartX - touchPos.pageX) > 5 || Math.abs(touchStartY - touchPos.pageY) > 5;

                        // return true if there was no movement so rest of screen can scroll
                        return dX == horizontalDragPosition && dY == verticalDragPosition;
                    }
                ).bind(
                    'touchend.jsp',
                    function(e)
                    {
                        moving = false;
                        /*if(moved) {
                         return false;
                         }*/
                    }
                ).bind(
                    'click.jsp-touchclick',
                    function(e)
                    {
                        if(moved) {
                            moved = false;
                            return false;
                        }
                    }
                );
            }

            function destroy(){
                var currentY = contentPositionY(),
                    currentX = contentPositionX();
                elem.removeClass('jspScrollable').unbind('.jsp');
                elem.replaceWith(originalElement.append(pane.children()));
                originalElement.scrollTop(currentY);
                originalElement.scrollLeft(currentX);
            }

            // Public API
            $.extend(
                jsp,
                {
                    // Reinitialises the scroll pane (if it's internal dimensions have changed since the last time it
                    // was initialised). The settings object which is passed in will override any settings from the
                    // previous time it was initialised - if you don't pass any settings then the ones from the previous
                    // initialisation will be used.
                    reinitialise: function(s)
                    {
                        s = $.extend({}, settings, s);
                        initialise(s);
                    },
                    // Scrolls the specified element (a jQuery object, DOM node or jQuery selector string) into view so
                    // that it can be seen within the viewport. If stickToTop is true then the element will appear at
                    // the top of the viewport, if it is false then the viewport will scroll as little as possible to
                    // show the element. You can also specify if you want animation to occur. If you don't provide this
                    // argument then the animateScroll value from the settings object is used instead.
                    scrollToElement: function(ele, stickToTop, animate)
                    {
                        scrollToElement(ele, stickToTop, animate);
                    },
                    // Scrolls the pane so that the specified co-ordinates within the content are at the top left
                    // of the viewport. animate is optional and if not passed then the value of animateScroll from
                    // the settings object this jScrollPane was initialised with is used.
                    scrollTo: function(destX, destY, animate)
                    {
                        scrollToX(destX, animate);
                        scrollToY(destY, animate);
                    },
                    // Scrolls the pane so that the specified co-ordinate within the content is at the left of the
                    // viewport. animate is optional and if not passed then the value of animateScroll from the settings
                    // object this jScrollPane was initialised with is used.
                    scrollToX: function(destX, animate)
                    {
                        scrollToX(destX, animate);
                    },
                    // Scrolls the pane so that the specified co-ordinate within the content is at the top of the
                    // viewport. animate is optional and if not passed then the value of animateScroll from the settings
                    // object this jScrollPane was initialised with is used.
                    scrollToY: function(destY, animate)
                    {
                        scrollToY(destY, animate);
                    },
                    // Scrolls the pane to the specified percentage of its maximum horizontal scroll position. animate
                    // is optional and if not passed then the value of animateScroll from the settings object this
                    // jScrollPane was initialised with is used.
                    scrollToPercentX: function(destPercentX, animate)
                    {
                        scrollToX(destPercentX * (contentWidth - paneWidth), animate);
                    },
                    // Scrolls the pane to the specified percentage of its maximum vertical scroll position. animate
                    // is optional and if not passed then the value of animateScroll from the settings object this
                    // jScrollPane was initialised with is used.
                    scrollToPercentY: function(destPercentY, animate)
                    {
                        scrollToY(destPercentY * (contentHeight - paneHeight), animate);
                    },
                    // Scrolls the pane by the specified amount of pixels. animate is optional and if not passed then
                    // the value of animateScroll from the settings object this jScrollPane was initialised with is used.
                    scrollBy: function(deltaX, deltaY, animate)
                    {
                        jsp.scrollByX(deltaX, animate);
                        jsp.scrollByY(deltaY, animate);
                    },
                    // Scrolls the pane by the specified amount of pixels. animate is optional and if not passed then
                    // the value of animateScroll from the settings object this jScrollPane was initialised with is used.
                    scrollByX: function(deltaX, animate)
                    {
                        var destX = contentPositionX() + Math[deltaX<0 ? 'floor' : 'ceil'](deltaX),
                            percentScrolled = destX / (contentWidth - paneWidth);
                        positionDragX(percentScrolled * dragMaxX, animate);
                    },
                    // Scrolls the pane by the specified amount of pixels. animate is optional and if not passed then
                    // the value of animateScroll from the settings object this jScrollPane was initialised with is used.
                    scrollByY: function(deltaY, animate)
                    {
                        var destY = contentPositionY() + Math[deltaY<0 ? 'floor' : 'ceil'](deltaY),
                            percentScrolled = destY / (contentHeight - paneHeight);
                        positionDragY(percentScrolled * dragMaxY, animate);
                    },
                    // Positions the horizontal drag at the specified x position (and updates the viewport to reflect
                    // this). animate is optional and if not passed then the value of animateScroll from the settings
                    // object this jScrollPane was initialised with is used.
                    positionDragX: function(x, animate)
                    {
                        positionDragX(x, animate);
                    },
                    // Positions the vertical drag at the specified y position (and updates the viewport to reflect
                    // this). animate is optional and if not passed then the value of animateScroll from the settings
                    // object this jScrollPane was initialised with is used.
                    positionDragY: function(y, animate)
                    {
                        positionDragY(y, animate);
                    },
                    // This method is called when jScrollPane is trying to animate to a new position. You can override
                    // it if you want to provide advanced animation functionality. It is passed the following arguments:
                    //  * ele          - the element whose position is being animated
                    //  * prop         - the property that is being animated
                    //  * value        - the value it's being animated to
                    //  * stepCallback - a function that you must execute each time you update the value of the property
                    // You can use the default implementation (below) as a starting point for your own implementation.
                    animate: function(ele, prop, value, stepCallback)
                    {
                        var params = {};
                        params[prop] = value;
                        ele.animate(
                            params,
                            {
                                'duration'	: settings.animateDuration,
                                'ease'		: settings.animateEase,
                                'queue'		: false,
                                'step'		: stepCallback
                            }
                        );
                    },
                    // Returns the current x position of the viewport with regards to the content pane.
                    getContentPositionX: function()
                    {
                        return contentPositionX();
                    },
                    // Returns the current y position of the viewport with regards to the content pane.
                    getContentPositionY: function()
                    {
                        return contentPositionY();
                    },
                    // Returns the width of the content within the scroll pane.
                    getContentWidth: function()
                    {
                        return contentWidth;
                    },
                    // Returns the height of the content within the scroll pane.
                    getContentHeight: function()
                    {
                        return contentHeight;
                    },
                    // Returns the horizontal position of the viewport within the pane content.
                    getPercentScrolledX: function()
                    {
                        return contentPositionX() / (contentWidth - paneWidth);
                    },
                    // Returns the vertical position of the viewport within the pane content.
                    getPercentScrolledY: function()
                    {
                        return contentPositionY() / (contentHeight - paneHeight);
                    },
                    // Returns whether or not this scrollpane has a horizontal scrollbar.
                    getIsScrollableH: function()
                    {
                        return isScrollableH;
                    },
                    // Returns whether or not this scrollpane has a vertical scrollbar.
                    getIsScrollableV: function()
                    {
                        return isScrollableV;
                    },
                    // Gets a reference to the content pane. It is important that you use this method if you want to
                    // edit the content of your jScrollPane as if you access the element directly then you may have some
                    // problems (as your original element has had additional elements for the scrollbars etc added into
                    // it).
                    getContentPane: function()
                    {
                        return pane;
                    },
                    // Scrolls this jScrollPane down as far as it can currently scroll. If animate isn't passed then the
                    // animateScroll value from settings is used instead.
                    scrollToBottom: function(animate)
                    {
                        positionDragY(dragMaxY, animate);
                    },
                    // Hijacks the links on the page which link to content inside the scrollpane. If you have changed
                    // the content of your page (e.g. via AJAX) and want to make sure any new anchor links to the
                    // contents of your scroll pane will work then call this function.
                    hijackInternalLinks: function()
                    {
                        hijackInternalLinks();
                    },
                    // Removes the jScrollPane and returns the page to the state it was in before jScrollPane was
                    // initialised.
                    destroy: function()
                    {
                        destroy();
                    }
                }
            );

            initialise(s);
        }

        // Pluginifying code...
        settings = $.extend({}, $.fn.jScrollPane.defaults, settings);

        // Apply default speed
        $.each(['mouseWheelSpeed', 'arrowButtonSpeed', 'trackClickSpeed', 'keyboardSpeed'], function() {
            settings[this] = settings[this] || settings.speed;
        });

        return this.each(
            function()
            {
                var elem = $(this), jspApi = elem.data('jsp');
                if (jspApi) {
                    jspApi.reinitialise(settings);
                } else {
                    jspApi = new JScrollPane(elem, settings);
                    elem.data('jsp', jspApi);
                }
            }
        );
    };

    $.fn.jScrollPane.defaults = {
        showArrows					: false,
        maintainPosition			: true,
        stickToBottom				: false,
        stickToRight				: false,
        clickOnTrack				: true,
        autoReinitialise			: false,
        autoReinitialiseDelay		: 500,
        verticalDragMinHeight		: 0,
        verticalDragMaxHeight		: 99999,
        horizontalDragMinWidth		: 0,
        horizontalDragMaxWidth		: 99999,
        contentWidth				: undefined,
        animateScroll				: false,
        animateDuration				: 300,
        animateEase					: 'linear',
        hijackInternalLinks			: false,
        verticalGutter				: 4,
        horizontalGutter			: 4,
        mouseWheelSpeed				: 0,
        arrowButtonSpeed			: 0,
        arrowRepeatFreq				: 50,
        arrowScrollOnHover			: false,
        trackClickSpeed				: 0,
        trackClickRepeatFreq		: 70,
        verticalArrowPositions		: 'split',
        horizontalArrowPositions	: 'split',
        enableKeyboardNavigation	: true,
        hideFocus					: false,
        keyboardSpeed				: 0,
        initialDelay                : 300,        // Delay before starting repeating
        speed						: 30,		// Default speed when others falsey
        scrollPagePercent			: .8		// Percent of visible area scrolled when pageUp/Down or track area pressed
    };

})(jQuery,this);
