/*!
 * FullCalendar v1.2.1
 * http://arshaw.com/fullcalendar/
 *
 * use fullcalendar.css for basic styling
 * requires jQuery UI core and draggables ONLY if you plan to do drag & drop
 *
 * Copyright (c) 2009 Adam Shaw
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 *
 * Date: 2009-05-31 13:56:02 -0700 (Sun, 31 May 2009)
 * Revision: 23
 */
 
(function($) {

    $.fn.fullCalendar = function(options) {


        //
        // Calls methods on a pre-existing instance
        //

        if (typeof options == 'string') {
            var args = Array.prototype.slice.call(arguments, 1);
            var res;
            this.each(function() {
                var r = $.data(this, 'fullCalendar')[options].apply(this, args);
                if (typeof res == 'undefined') res = r;
            });
            if (typeof res != 'undefined') {
                return res;
            }
            return this;
        }



        //
        // Process options
        //

        options = options || {};

        var r2l = options.rightToLeft;
        var dis, dit; // day index sign / translate
        if (r2l) {
            dis = -1;
            dit = 6;
            this.addClass('r2l');
        } else {
            dis = 1;
            dit = 0;
        }

        var showTime = typeof options.showTime == 'undefined' ? 'guess' : options.showTime;
        var bo = typeof options.buttons == 'undefined' ? true : options.buttons;
        var weekStart = (options.weekStart || 0) % 7;
        var timeFormat = options.timeFormat || 'gx';
        var titleFormat = options.titleFormat || (r2l ? 'Y F' : 'F Y');



        //
        // Rendering bug detection variables
        //

        var tdTopBug, trTopBug, tbodyTopBug, sniffBugs = true;



        this.each(function() {


            //
            // Instance variables
            //

            var date = options.year ? // holds the year & month of current month
				new Date(options.year, options.month || 0, 1) :
				new Date();
            var start, end; // first & last VISIBLE dates
            var today;
            var numWeeks;
            var ignoreResizes = false;

            var events = [];
            var eventSources = options.eventSources || [];
            if (options.events) eventSources.push(options.events);



            //
            // Month navigation functions
            //

            function refreshMonth() {
                clearEventElements();
                render();
            }

            function prevMonth() {
                addMonths(date, -1);
                refreshMonth();
            }

            function nextMonth() {
                addMonths(date, 1);
                refreshMonth();
            }

            function gotoToday() {
                date = new Date();
                refreshMonth();
            }

            function gotoMonth(year, month) {
                date = new Date(year, month, 1);
                refreshMonth();
            }

            function prevYear() {
                addYears(date, -1);
                refreshMonth();
            }

            function nextYear() {
                addYears(date, 1);
                refreshMonth();
            }



            //
            // Publicly accessible methods
            //

            $.data(this, 'fullCalendar', {
                refresh: refreshMonth,
                prevMonth: prevMonth,
                nextMonth: nextMonth,
                today: gotoToday,
                gotoMonth: gotoMonth,
                prevYear: prevYear,
                nextYear: nextYear,


                //
                // Event CRUD
                //

                addEvent: function(event) {
                    events.push(normalizeEvent(event));
                    clearEventElements();
                    renderEvents();
                },

                updateEvent: function(event) {
                    event.start = $.fullCalendar.parseDate(event.start);
                    event.end = $.fullCalendar.parseDate(event.end);
                    var startDelta = event.start - event._start;
                    var msLength = event.end - event.start;
                    event._start = cloneDate(event.start);
                    for (var i = 0; i < events.length; i++) {
                        var e = events[i];
                        if (e.id === event.id && e !== event) {
                            e.start = new Date(e.start.getTime() + startDelta);
                            e._start = cloneDate(e.start);
                            e.end = new Date(e.start.getTime() + msLength);
                            for (var k in event) {
                                if (k && k != 'start' && k != 'end' && k.charAt(0) != '_') {
                                    e[k] = event[k];
                                }
                            }
                        }
                    }
                    clearEventElements();
                    renderEvents();
                },

                removeEvent: function(eventId) {
                    if (typeof eventId == 'object') {
                        eventId = eventId.id;
                    }

                    // remove from the 'events' array
                    var newEvents = [];
                    for (var i = 0; i < events.length; i++) {
                        if (events[i].id !== eventId) {
                            newEvents.push(events[i]);
                        }
                    }
                    events = newEvents;

                    // remove from static event sources
                    for (var i = 0; i < eventSources.length; i++) {
                        var src = eventSources[i];
                        if (typeof src != 'string' && !$.isFunction(src)) {
                            var newSrc = [];
                            for (var j = 0; j < src.length; j++) {
                                if (src[j].id !== eventId) {
                                    newSrc.push(src[j]);
                                }
                            }
                            eventSources[i] = newSrc;
                        }
                    }

                    clearEventElements();
                    renderEvents();
                },

                getEventsById: function(eventId) {
                    var res = [];
                    for (var i = 0; i < events.length; i++) {
                        if (events[i].id === eventId) {
                            res.push(events[i]);
                        }
                    }
                    return res;
                },



                //
                // Event Source CRUD
                //

                addEventSource: function(src) {
                    eventSources.push(src);
                    pushLoading();
                    fetchEventSource(src, function() {
                        popLoading();
                        clearEventElements();
                        renderEvents();
                    });
                },

                removeEventSource: function(src) {

                    // remove from 'eventSources' array
                    var newSources = [];
                    for (var i = 0; i < eventSources.length; i++) {
                        if (src !== eventSources[i]) {
                            newSources.push(eventSources[i]);
                        }
                    }
                    eventSources = newSources;

                    // remove events from 'events' array
                    var newEvents = [];
                    for (var i = 0; i < events.length; i++) {
                        if (events[i].source !== src) {
                            newEvents.push(events[i]);
                        }
                    }
                    events = newEvents;

                    clearEventElements();
                    renderEvents();
                }

            });





            /*******************************************************************/
            //
            //		Header & Table Rendering
            //
            /*******************************************************************/


            //
            // Build one-time DOM elements (header, month container)
            //

            var titleElement, todayButton, monthElement, monthElementWidth;
            var header = $("<div class='full-calendar-header'/>").appendTo(this);

            if (bo) { // "button options"
                var buttons = $("<div class='full-calendar-buttons'/>").appendTo(header);
                if (bo == true || bo.today !== false) {
                    todayButton = $("<button class='today' />")
						.append($("<span />").html(
							typeof bo.today == 'string' ?
								bo.today : "today"))
						.click(gotoToday);
                    buttons.append(todayButton);
                }
                if (bo.prevYear) {
                    var b = $("<button class='prev-year' />")
						.append($("<span />")
							.html(typeof bo.prevYear == 'string' ?
								bo.prevYear : "&laquo;"))
						.click(prevYear);
                    if (r2l) buttons.prepend(b);
                    else buttons.append(b);
                }
                if (bo == true || bo.prevMonth !== false) {
                    var b = $("<button class='prev-month' />")
						.append($("<span />")
							.html(typeof bo.prevMonth == 'string' ?
								bo.prevMonth : (r2l ? "&gt;" : "&lt;")))
						.click(prevMonth);
                    if (r2l) buttons.prepend(b);
                    else buttons.append(b);
                }
                if (bo == true || bo.nextMonth !== false) {
                    var b = $("<button class='next-month' />")
						.append($("<span />").html(typeof bo.nextMonth == 'string' ?
							bo.nextMonth : (r2l ? "&lt;" : "&gt;")))
						.click(nextMonth);
                    if (r2l) buttons.prepend(b);
                    else buttons.append(b);
                }
                if (bo.nextYear) {
                    var b = $("<button class='next-year' />")
						.append($("<span />").html(typeof bo.nextYear == 'string'
							? bo.nextYear : "&raquo;"))
						.click(nextYear);
                    if (r2l) buttons.prepend(b);
                    else buttons.append(b);
                }
            }

            if (options.title !== false) {
                titleElement = $("<h2 class='full-calendar-title'/>").appendTo(header);
            }

            monthElement = $("<div class='full-calendar-month' style='position:relative'/>")
				.appendTo($("<div class='full-calendar-month-wrap'/>").appendTo(this));


            //
            // Build the TABLE cells for the current month. (calls event fetching & rendering code)
            //

            var thead, tbody, glass;

            function render() {

                ignoreResizes = true;
                date.setDate(1);
                clearTime(date);
                var year = date.getFullYear();
                var month = date.getMonth();
                var monthTitle = $.fullCalendar.formatDate(date, titleFormat);
                if (titleElement) titleElement.text(monthTitle);

                clearTime(date);
                start = cloneDate(date);
                addDays(start, -((start.getDay() - weekStart + 7) % 7));
                end = cloneDate(date);
                addMonths(end, 1);
                addDays(end, (7 - end.getDay() + weekStart) % 7);
                numWeeks = Math.round((end.getTime() - start.getTime()) / 604800000);
                if (options.fixedWeeks != false) {
                    addDays(end, (6 - numWeeks) * 7);
                    numWeeks = 6;
                }

                today = clearTime(new Date());
                if (todayButton) {
                    if (today.getFullYear() == year && today.getMonth() == month) {
                        todayButton.css('visibility', 'hidden');
                    } else {
                        todayButton.css('visibility', 'visible');
                    }
                }

                var dayNames = $.fullCalendar.dayNames;
                var dayAbbrevs = $.fullCalendar.dayAbbrevs;

                if (!tbody) {

                    // first time, build all cells from scratch

                    var table = $("<table style='width:100%'/>").appendTo(monthElement);

                    thead = "<thead><tr>";
                    for (var i = 0; i < 7; i++) {
                        var j = (i * dis + dit + weekStart) % 7;
                        thead +=
							"<th class='" + dayAbbrevs[j].toLowerCase() +
							(i == 0 ? ' first' : '') + "'>" +
							(options.abbrevDayHeadings != false ? dayAbbrevs[j] : dayNames[j]) +
							"</th>";
                    }
                    thead = $(thead + "</tr></thead>").appendTo(table);

                    tbody = "<tbody>";
                    var d = cloneDate(start);
                    for (var i = 0; i < numWeeks; i++) {
                        tbody += "<tr class='week" + (i + 1) + "'>";
                        var tds = "";
                        for (var j = 0; j < 7; j++) {
                            var s =
								"<td class='day " + dayAbbrevs[(j + weekStart) % 7].toLowerCase() +
								(j == dit ? ' first' : '') +
								(d.getMonth() == month ? '' : ' other-month') +
								(d.getTime() == today.getTime() ? ' today' : '') +
								"'><div class='day-number'>" + d.getDate() + "</div>" +
								"<div class='day-content'><div/></div></td>";
                            if (r2l) tds = s + tds;
                            else tds += s;
                            addDays(d, 1);
                        }
                        tbody += tds + "</tr>";
                    }
                    tbody = $(tbody + "</tbody>").appendTo(table);

                    // a protective coating over the TABLE
                    // intercepts mouse clicks and prevents text-selection
                    glass = $("<div style='position:absolute;top:0;left:0;z-index:1;width:100%' />")
						.appendTo(monthElement)
						.click(function(ev, ui) {
						    if (options.dayClick) {
						        buildDayGrid();
						        var td = dayTD(ev.pageX, ev.pageY);
						        if (td) return options.dayClick.call(td, dayDate(td));
						    }
						});

                } else {

                    // NOT first time, reuse as many cells as possible

                    var diff = numWeeks - tbody.find('tr').length;
                    if (diff < 0) {
                        // remove extra rows
                        tbody.find('tr:gt(' + (numWeeks - 1) + ')').remove();
                    }
                    else if (diff > 0) {
                        var trs = "";
                        for (var i = 0; i < diff; i++) {
                            trs += "<tr class='week" + (numWeeks + i) + "'>";
                            for (var j = 0; j < 7; j++) {
                                trs +=
									"<td class='day " +
									dayAbbrevs[(j * dis + dit + weekStart) % 7].toLowerCase() +
									(j == 0 ? ' first' : '') + "'>" +
									"<div class='day-number'></div>" +
									"<div class='day-content'><div/></div>" +
									"</td>";
                            }
                            trs += "</tr>";
                        }
                        if (trs) tbody.append(trs);
                    }

                    // re-label and re-class existing cells
                    var d = cloneDate(start);
                    tbody.find('tr').each(function() {
                        for (var i = 0; i < 7; i++) {
                            var td = this.childNodes[i * dis + dit];
                            if (d.getMonth() == month) {
                                $(td).removeClass('other-month');
                            } else {
                                $(td).addClass('other-month');
                            }
                            if (d.getTime() == today.getTime()) {
                                $(td).addClass('today');
                            } else {
                                $(td).removeClass('today');
                            }
                            $(td.childNodes[0]).text(d.getDate());
                            addDays(d, 1);
                        }
                    });

                }

                setCellSizes();

                if (sniffBugs) {
                    // nasty bugs in opera 9.25
                    // position() returning relative to direct parent
                    var tr = tbody.find('tr');
                    var td = tr.find('td');
                    var trTop = tr.position().top;
                    var tdTop = td.position().top;
                    tdTopBug = tdTop < 0;
                    trTopBug = trTop != tdTop;
                    tbodyTopBug = tbody.position().top != trTop;
                    sniffBugs = false;
                }

                fetchEvents(renderEvents);

                ignoreResizes = false;

                if (options.monthDisplay) {
                    options.monthDisplay(date.getFullYear(), date.getMonth(), monthTitle);
                }

            }


            //
            // Adjust dimensions of the cells, based on container's width
            //

            function setCellSizes() {
                var tbodyw = tbody.width();
                var cellw = Math.floor(tbodyw / 7);
                var cellh = Math.round(cellw * .85);
                thead.find('th')
					.filter(':lt(6)').width(cellw).end()
					.filter(':eq(6)').width(tbodyw - cellw * 6);
                tbody.find('td').height(cellh);
                glass.height(monthElement.height());
                monthElementWidth = monthElement.width();
            }






            /*******************************************************************/
            //
            //		Event Rendering
            //
            /*******************************************************************/


            //
            // Render the 'events' array. First, break up into segments
            //

            var eventMatrix = [];

            function renderEvents() {
                eventMatrix = [];
                var i = 0;
                var ws = cloneDate(start);
                var we = addDays(cloneDate(ws), 7);
                while (ws.getTime() < end.getTime()) {
                    var segs = [];
                    $.each(events, function(j, event) {
                        if (event.end.getTime() > ws.getTime() && event.start.getTime() < we.getTime()) {
                            var ss, se, isStart, isEnd;
                            if (event.start.getTime() < ws.getTime()) {
                                ss = cloneDate(ws);
                                isStart = false;
                            } else {
                                ss = cloneDate(event.start);
                                isStart = true;
                            }
                            if (event.end.getTime() > we.getTime()) {
                                se = cloneDate(we);
                                isEnd = false;
                            } else {
                                se = cloneDate(event.end);
                                isEnd = true;
                            }
                            ss = clearTime(ss);
                            se = clearTime((se.getHours() == 0 && se.getMinutes() == 0) ? se : addDays(se, 1));
                            segs.push({
                                event: event, start: ss, end: se,
                                isStart: isStart, isEnd: isEnd, msLength: se - ss
                            });
                        }
                    });
                    segs.sort(segCmp);
                    var levels = [];
                    $.each(segs, function(j, seg) {
                        var l = 0; // level index
                        while (true) {
                            var collide = false;
                            if (levels[l]) {
                                for (var k = 0; k < levels[l].length; k++) {
                                    if (seg.end.getTime() > levels[l][k].start.getTime() &&
										seg.start.getTime() < levels[l][k].end.getTime()) {
                                        collide = true;
                                        break;
                                    }
                                }
                            }
                            if (collide) {
                                l++;
                                continue;
                            } else {
                                break;
                            }
                        }
                        if (levels[l]) levels[l].push(seg);
                        else levels[l] = [seg];
                    });
                    eventMatrix[i] = levels;
                    addDays(ws, 7);
                    addDays(we, 7);
                    i++;
                }
                _renderEvents();
            }


            //
            // Do the REAL rendering of the segments
            //

            var eventElements = []; // [[event, element], ...]

            function _renderEvents() {
                for (var i = 0; i < eventMatrix.length; i++) {
                    var levels = eventMatrix[i];
                    var tr = tbody.find('tr:eq(' + i + ')');
                    var td = tr.find('td:first');
                    var innerDiv = td.find('div.day-content div').css('position', 'relative');
                    var top = innerDiv.position().top;
                    if (tdTopBug) top -= td.position().top;
                    if (trTopBug) top += tr.position().top;
                    if (tbodyTopBug) top += tbody.position().top;
                    var height = 0;
                    for (var j = 0; j < levels.length; j++) {
                        var segs = levels[j];
                        var maxh = 0;
                        for (var k = 0; k < segs.length; k++) {
                            var seg = segs[k];
                            var event = seg.event;
                            var left1, left2, roundW, roundE;
                            if (r2l) {
                                left2 = seg.isStart ?
									tr.find('td:eq(' + ((seg.start.getDay() - weekStart + 7) % 7 * dis + dit) + ') div.day-content div') :
									tbody;
                                left1 = seg.isEnd ?
									tr.find('td:eq(' + ((seg.end.getDay() + 6 - weekStart) % 7 * dis + dit) + ') div.day-content div').position().left :
									tbody.position().left;
                                roundW = seg.isEnd;
                                roundE = seg.isStart;
                            } else {
                                left1 = seg.isStart ?
									tr.find('td:eq(' + ((seg.start.getDay() - weekStart + 7) % 7) + ') div.day-content div').position().left :
									tbody.position().left;
                                left2 = seg.isEnd ?
									tr.find('td:eq(' + ((seg.end.getDay() + 6 - weekStart) % 7) + ') div.day-content div') :
									tbody;
                                roundW = seg.isStart;
                                roundE = seg.isEnd;
                            }
                            left2 = left2.position().left + left2.width();
                            var cl = event.className;
                            if (typeof cl == 'string') {
                                cl = ' ' + cl;
                            }
                            else if (typeof cl == 'object') {
                                cl = ' ' + cl.join(' ');
                            }
                            var element = $("<table class='event" + (cl || '') + "' />")
								.append("<tr>" +
									(roundW ? "<td class='nw'/>" : '') +
									"<td class='n'/>" +
									(roundE ? "<td class='ne'/>" : '') + "</tr>")
								.append("<tr>" +
									(roundW ? "<td class='w'/>" : '') +
									"<td class='c'/>" +
									(roundE ? "<td class='e'/>" : '') + "</tr>")
								.append("<tr>" +
									(roundW ? "<td class='sw'/>" : '') +
									"<td class='s'/>" +
									(roundE ? "<td class='se'/>" : '') + "</tr>");
                            buildEventText(event, element.find('td.c'));
                            if (options.eventRender) {
                                var res = options.eventRender(event, element);
                                if (typeof res != 'undefined') {
                                    if (res === false) continue;
                                    if (res !== true) element = $(res);
                                }
                            }
                            element
								.css({
								    position: 'absolute',
								    top: top,
								    left: left1,
								    width: left2 - left1,
								    'z-index': 3
								})
								.appendTo(monthElement);
                            initEventElement(event, element);
                            var h = element.outerHeight({ margin: true });
                            if (h > maxh) maxh = h;
                        }
                        height += maxh;
                        top += maxh;
                    }
                    innerDiv.height(height);
                }
            }


            //
            // create the text-contents of an event segment
            //

            function buildEventText(event, element) {
                $("<span class='event-title' />")
					.text(event.title)
					.appendTo(element);
                var st = typeof event.showTime == 'undefined' ? showTime : event.showTime;
                //alert("building event" + );
                if (st != false) {
                    if (st == true || st == 'guess' &&
						(event.start.getHours() || event.start.getMinutes() ||
						 event.end.getHours() || event.end.getMinutes())) {
                        var timeStr = $.fullCalendar.formatDate(event.start, timeFormat);
                        var timeElement = $("<span class='event-time' />");
                        if (r2l) element.append(timeElement.text(' ' + timeStr));
                        else element.prepend(timeElement.text(timeStr + ' '));
                    }
                }
            }


            //
            // Attach event handlers to an event segment
            //

            function initEventElement(event, element) {
                element.click(function(ev) {
                    if (!element.hasClass('ui-draggable-dragging')) {
                        if (options.eventClick) {
                            var res = options.eventClick.call(this, event, ev);
                            if (res === false) return false;
                        }
                        if (event.url) window.location.href = event.url;
                    }
                });
                if (options.eventMouseover)
                    element.mouseover(function(ev) {
                        options.eventMouseover.call(this, event, ev);
                    });
                if (options.eventMouseout)
                    element.mouseout(function(ev) {
                        options.eventMouseout.call(this, event, ev);
                    });
                if (typeof event.draggable != 'undefined') {
                    if (event.draggable)
                        draggableEvent(event, element);
                }
                else if (options.draggable) {
                    draggableEvent(event, element);
                }
                eventElements.push([event, element]);
            }


            //
            // Remove all event segments from DOM
            //

            function clearEventElements() {
                for (var i = 0; i < eventElements.length; i++)
                    eventElements[i][1].remove();
                eventElements = [];
            }







            /*******************************************************************/
            //
            //		Drag & Drop		(and cell-coordinate stuff)
            //
            /*******************************************************************/


            //
            // Attach jQuery UI draggable
            //

            var dragStartTD, dragTD;
            var dayOverlay;

            function draggableEvent(event, element) {
                element.draggable({
                    zIndex: 4,
                    delay: 50,
                    opacity: options.eventDragOpacity,
                    revertDuration: options.eventRevertDuration,
                    start: function(ev, ui) {
                        // hide other elements with same event
                        for (var i = 0; i < eventElements.length; i++) {
                            var x = eventElements[i];
                            var xevent = x[0];
                            if (x[1].get(0) != this && (xevent == event ||
								typeof xevent.id != 'undefined' && xevent.id == event.id))
                                x[1].hide();
                        }
                        if (!dayOverlay)
                            dayOverlay =
								$("<div class='over-day' style='position:absolute;z-index:2' />")
									.appendTo(monthElement);
                        buildDayGrid();
                        dragTD = dragStartTD = null;
                        eventDrag(this, ev, ui);
                        if (options.eventDragStart)
                            options.eventDragStart.call(this, event, ev, ui);
                    },
                    drag: function(ev, ui) {
                        eventDrag(this, ev, ui);
                    },
                    stop: function(ev, ui) {
                        if (!dragTD || dragTD == dragStartTD) {
                            // show all events
                            for (var i = 0; i < eventElements.length; i++)
                                eventElements[i][1].show();
                        } else {
                            var delta = dayDelta(dragStartTD, dragTD);
                            for (var i = 0; i < events.length; i++) {
                                if (event == events[i] || typeof event.id != 'undefined' && event.id == events[i].id) {
                                    addDays(events[i].start, delta, true);
                                    addDays(events[i].end, delta, true);
                                    events[i]._start = cloneDate(events[i].start);
                                }
                            }
                            if (options.eventDrop) {
                                options.eventDrop.call(this, event, delta, ev, ui);
                            }
                            clearEventElements();
                            renderEvents();
                        }
                        dayOverlay.hide();
                        if (options.eventDragStop) {
                            options.eventDragStop.call(this, event, ev, ui);
                        }
                    }
                });
            }


            //
            // Called DURING dragging, on every mouse move
            //

            function eventDrag(node, ev, ui) {
                var oldTD = dragTD;
                dragTD = dayTD(ev.pageX, ev.pageY);
                if (!dragStartTD) dragStartTD = dragTD;
                if (dragTD != oldTD) {
                    if (dragTD) {
                        $(node).draggable('option', 'revert', dragTD == dragStartTD);
                        dayOverlay.css({
                            top: currTDY,
                            left: currTDX,
                            width: currTDW,
                            height: currTDH,
                            display: 'block'
                        });
                    } else {
                        $(node).draggable('option', 'revert', true);
                        dayOverlay.hide();
                    }
                }
            }


            //
            // Record positions & dimensions of each TD
            //

            var dayX, dayY, dayX0, dayY0;
            var currTD, currR, currC;
            var currTDX, currTDY, currTDW, currTDH;

            function buildDayGrid() {
                var tr, td, o = monthElement.offset();
                dayX0 = o.left;
                dayY0 = o.top;
                dayY = [];
                tbody.find('tr').each(function() {
                    tr = $(this);
                    dayY.push(tr.position().top +
						(trTopBug ? tbody.position().top : 0));
                });
                dayY.push(dayY[dayY.length - 1] + tr.height());
                dayX = [];
                tr.find('td').each(function() {
                    td = $(this);
                    dayX.push(td.position().left);
                });
                dayX.push(dayX[dayX.length - 1] + td.width());
                currTD = null;
            }

            //
            // Returns TD underneath coordinate (optimized)
            //

            function dayTD(x, y) {
                var r = -1, c = -1;
                var rmax = dayY.length - 1, cmax = dayX.length - 1;
                while (r < rmax && y > dayY0 + dayY[r + 1]) r++;
                while (c < cmax && x > dayX0 + dayX[c + 1]) c++;
                if (r < 0 || r >= rmax || c < 0 || c >= cmax)
                    return currTD = null;
                else if (!currTD || r != currR || c != currC) {
                    currR = r;
                    currC = c;
                    currTD = tbody.find('tr:eq(' + r + ') td:eq(' + c + ')').get(0);
                    currTDX = dayX[c];
                    currTDY = dayY[r];
                    currTDW = dayX[c + 1] - currTDX;
                    currTDH = dayY[r + 1] - currTDY;
                    return currTD;
                }
                return currTD;
            }

            //
            // Get a TD's date
            //

            function dayDate(td) {
                var i, trs = tbody.get(0).getElementsByTagName('tr');
                for (i = 0; i < trs.length; i++) {
                    var tr = trs[i];
                    for (var j = 0; j < 7; j++) {
                        if (tr.childNodes[j] == td) {
                            var d = cloneDate(start);
                            return addDays(d, i * 7 + j * dis + dit);
                        }
                    }
                }
            }

            //
            // Return the # of days between 2 TD's
            //

            function dayDelta(td1, td2) {
                var i1, i2, trs = tbody.get(0).getElementsByTagName('tr');
                for (var i = 0; i < trs.length; i++) {
                    var tr = trs[i];
                    for (var j = 0; j < 7; j++) {
                        var td = tr.childNodes[j];
                        if (td == td1) i1 = i * 7 + j * dis + dit;
                        if (td == td2) i2 = i * 7 + j * dis + dit;
                    }
                }
                return i2 - i1;
            }







            /*******************************************************************/
            //
            //		Event Sources & Fetching
            //
            /*******************************************************************/


            //
            // Fetch from ALL sources. Clear 'events' array and populate
            //

            function fetchEvents(callback) {
                events = [];
                if (eventSources.length > 0) {
                    var queued = eventSources.length;
                    var sourceDone = function() {
                        if (--queued == 0) {
                            popLoading();
                            if (callback) {
                                callback(events);
                            }
                        }
                    };
                    pushLoading();
                    for (var i = 0; i < eventSources.length; i++) {
                        fetchEventSource(eventSources[i], sourceDone);
                    }
                }
            }


            //
            // Fetch from a particular source. Append to the 'events' array
            //

            function fetchEventSource(src, callback) {
                var y = date.getFullYear();
                var m = date.getMonth();
                var reportEvents = function(a) {
                    if (date.getFullYear() == y && date.getMonth() == m) {
                        for (var i = 0; i < a.length; i++) {
                            normalizeEvent(a[i]);
                            a[i].source = src;
                        }
                        events = events.concat(a);
                    }
                    if (callback) {
                        callback(a);
                    }
                };
                if (typeof src == 'string') {
                    var params = {};
                    params[options.startParam || 'start'] = Math.round(start.getTime() / 1000);
                    params[options.endParam || 'end'] = Math.round(end.getTime() / 1000);
                    params[options.cacheParam || '_'] = (new Date()).getTime();
                    $.getJSON(src, params, reportEvents);
                }
                else if ($.isFunction(src)) {
                    src(start, end, reportEvents);
                }
                else {
                    reportEvents(src);
                }
            }


            //
            // methods for reporting loading state
            //

            var loadingLevel = 0;

            function pushLoading() {
                if (!loadingLevel++ && options.loading) {
                    options.loading(true);
                }
            }

            function popLoading() {
                if (! --loadingLevel && options.loading) {
                    options.loading(false);
                }
            }






            /*******************************************************************/
            //
            //		Begin "Main" Execution
            //
            /*******************************************************************/

            var e = $(this);
            var _e = this;
            var resizeID = 0;
            $(window).resize(function() {   // re-render table on window resize
                if (!ignoreResizes) {
                    var rid = ++resizeID;   // add a delay
                    setTimeout(function() {
                        if (rid == resizeID) {
                            // if calendar is visible
                            if (e.css('display') != 'none') {
                                // if the month width changed
                                if (monthElement.width() != monthElementWidth) {
                                    clearEventElements();
                                    setCellSizes();
                                    _renderEvents();
                                    if (options.resize) options.resize.call(_e);
                                }
                            }
                        }
                    }, 200);
                }
            });

            // let's begin...
            if (e.css('display') != 'none') {
                render();
            }




        });

        return this;
    };




    /***************************************************************************/
    //
    //		Utilities
    //
    /***************************************************************************/


    //
    // event utils
    //

    function normalizeEvent(event) {
        if (event.date) {
            event.start = event.date;
            delete event.date;
        }
        event.start = $.fullCalendar.parseDate(event.start);
        event._start = cloneDate(event.start);
        event.end = $.fullCalendar.parseDate(event.end);
        if (!event.end || event.end <= event.start) {
            event.end = addDays(cloneDate(event.start), 1);
        }
        return event;
    }

    function segCmp(a, b) {
        return (b.msLength - a.msLength) * 100 + (a.event.start - b.event.start);
    }


    //
    // string utils
    //

    function zeroPad(n) {
        return (n < 10 ? '0' : '') + n;
    }


    //
    // date utils
    //

    function addMonths(d, n, keepTime) {
        d.setMonth(d.getMonth() + n);
        if (keepTime) return d;
        return clearTime(d);
    }

    function addYears(d, n, keepTime) {
        d.setFullYear(d.getFullYear() + n);
        if (keepTime) return d;
        return clearTime(d);
    }

    function addDays(d, n, keepTime) {
        d.setDate(d.getDate() + n);
        if (keepTime) return d;
        return clearTime(d);
    }

    function clearTime(d) {
        d.setHours(0);
        d.setMinutes(0);
        d.setSeconds(0);
        d.setMilliseconds(0);
        return d;
    }

    function cloneDate(d) {
        return new Date(+d);
    }


    //
    // globally accessible date formatting & parsing
    //

    $.fullCalendar = {

        monthNames: ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
        monthAbbrevs: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
        dayNames: ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday'],
        dayAbbrevs: ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],

        formatDate: function(d, format) {
            var f = $.fullCalendar.dateFormatters;
            var s = '';
            for (var i = 0; i < format.length; i++) {
                var c = format.charAt(i);
                if (f[c]) {
                    s += f[c](d);
                } else {
                    s += c;
                }
            }
            return s;
        },

        dateFormatters: {
            'a': function(d) { return d.getHours() < 12 ? 'am' : 'pm' },
            'A': function(d) { return d.getHours() < 12 ? 'AM' : 'PM' },
            'x': function(d) { return d.getHours() < 12 ? 'a' : 'p' },
            'X': function(d) { return d.getHours() < 12 ? 'A' : 'P' },
            'g': function(d) { return d.getHours() % 12 || 12 },
            'G': function(d) { return d.getHours() },
            'h': function(d) { return zeroPad(d.getHours() % 12 || 12) },
            'H': function(d) { return zeroPad(d.getHours()) },
            'i': function(d) { return zeroPad(d.getMinutes()) },
            'F': function(d) { return $.fullCalendar.monthNames[d.getMonth()] },
            'm': function(d) { return zeroPad(d.getMonth() + 1) },
            'M': function(d) { return $.fullCalendar.monthAbbrevs[d.getMonth()] },
            'n': function(d) { return d.getMonth() + 1 },
            'Y': function(d) { return d.getFullYear() },
            'y': function(d) { return (d.getFullYear() + '').substring(2) },
            'c': function(d) {
                // ISO8601. derived from http://delete.me.uk/2005/03/iso8601.html
                return d.getUTCFullYear() +
					"-" + zeroPad(d.getUTCMonth() + 1) +
					"-" + zeroPad(d.getUTCDate()) +
					"T" + zeroPad(d.getUTCHours()) +
					":" + zeroPad(d.getUTCMinutes()) +
					":" + zeroPad(d.getUTCSeconds()) +
					"Z";
            }
        },

        parseDate: function(s) {
            if (typeof s == 'object')
                return s; // already a Date object
            if (typeof s == 'undefined')
                return null;
            if (typeof s == 'number')
                return new Date(s * 1000);
            return $.fullCalendar.parseISO8601(s, true) ||
			       Date.parse(s) ||
			       new Date(parseInt(s) * 1000);
        },

        parseISO8601: function(s, ignoreTimezone) {
            // derived from http://delete.me.uk/2005/03/iso8601.html
            var regexp = "([0-9]{4})(-([0-9]{2})(-([0-9]{2})" +
				"(T([0-9]{2}):([0-9]{2})(:([0-9]{2})(\.([0-9]+))?)?" +
				"(Z|(([-+])([0-9]{2}):([0-9]{2})))?)?)?)?";
            var d = s.match(new RegExp(regexp));
            if (!d) return null;
            var offset = 0;
            var date = new Date(d[1], 0, 1);
            if (d[3]) { date.setMonth(d[3] - 1); }
            if (d[5]) { date.setDate(d[5]); }
            if (d[7]) { date.setHours(d[7]); }
            if (d[8]) { date.setMinutes(d[8]); }
            if (d[10]) { date.setSeconds(d[10]); }
            if (d[12]) { date.setMilliseconds(Number("0." + d[12]) * 1000); }
            if (!ignoreTimezone) {
                if (d[14]) {
                    offset = (Number(d[16]) * 60) + Number(d[17]);
                    offset *= ((d[15] == '-') ? 1 : -1);
                }
                offset -= date.getTimezoneOffset();
            }
            return new Date(Number(date) + (offset * 60 * 1000));
        }

    };

    // additional FullCalendar "extensions" should be attached to $.fullCalendar

})(jQuery);