/*!!
Epoch DHTML JavaScript Calendar - Version 2.0.1
Primary JavaScript File
(c) 2006 MeanFreePath
Free for NON-COMMERCIAL use - see website for details and updates
http://www.meanfreepath.com/javascript_calendar/index.html
!!*/

/**
* The main Epoch class.  All publicly-accessible methods and properties are called from this class
*/
function Epoch(name,mode,targetelement,multiselect) {
    var self = this; //workaround due to varying definitions of "this" in variable scopes. see http://www.meanfreepath.com/support/epoch/epoch.html#self for details
    //DEFINE PRIVATE METHODS
    //-----------------------------------------------------------------------------
    /**
    * Declares and initializes the calendar variables.  All the variables here can be safely changed
    * (within reason ;) by the developer
    */
    function calConfig() {
        self.versionNumber = '2.0.1';
        self.displayYearInitial = self.curDate.getFullYear(); //the initial year to display on load
        self.displayMonthInitial = self.curDate.getMonth(); //the initial month to display on load (0-11)
        self.displayYear = self.displayYearInitial;
        self.displayMonth = self.displayMonthInitial;
        self.minDate = new Date(2005,3,1);
        self.maxDate = new Date(2020,6,31);
        self.startDay = 0; // the day the week will 'start' on: 0(Sun) to 6(Sat)
        self.showWeeks = true; //whether the week numbers will be shown
        self.selCurMonthOnly = true; //allow user to only select dates in the currently displayed month
    }
    //-----------------------------------------------------------------------------
    /**
    * All language settings for Epoch are made here.
    * Check Date.dateFormat() for the Date object's language settings
    */
    function setLang() {
        self.daylist = new Array('Do','Lu','Ma','Me','Gi','Ve','Sa','Do','Lu','Ma','Me','Gi','Ve','Sa');
        self.months_sh = new Array('Gen','Feb','Mar','Apr','Mag','Giu','Lug','Ago','Set','Ott','Nov','Dic');
        self.monthup_title = 'Vai al mese successivo';
        self.monthdn_title = 'Vai al mese precedente';
        self.clearbtn_caption = 'Azzera';
        self.clearbtn_title = 'Azzera tutte le date selezionate sul calendario';
        self.maxrange_caption = 'Questo è l\'intervallo massimo';
        self.closebtn_caption = 'Chiudi';
        self.closebtn_title = 'Chiudi il calendario';
    }
    //-----------------------------------------------------------------------------
    /**
    * Initializes the standard Gregorian Calendar parameters
    */
    function setDays() {
        self.daynames = new Array();
        var j=0;
        for(var i=self.startDay;i<self.startDay + 7;i++) {
            self.daynames[j++] = self.daylist[i];
        }
        self.monthDayCount = new Array(31,((self.curDate.getFullYear() - 2000) % 4 ? 28 : 29),31,30,31,30,31,31,30,31,30,31);
    }
    //-----------------------------------------------------------------------------
    /**
    * Creates the full DOM implementation of the calendar
    */
    function createCalendar() {
        var tbody, tr, td;
        self.calendar = document.createElement('table');
        self.calendar.setAttribute('id',self.name+'_calendar');
        setClass(self.calendar,'calendar');
        self.calendar.style.display = 'none'; //default to invisible
        //to prevent IE from selecting text when clicking on the calendar
        addEventHandler(self.calendar,'selectstart', function() {return false;});
        addEventHandler(self.calendar,'drag', function() {return false;});
        tbody = document.createElement('tbody');

        //create the Main Calendar Heading
        tr = document.createElement('tr');
        td = document.createElement('td');
        td.appendChild(createMainHeading());
        tr.appendChild(td);
        tbody.appendChild(tr);

        //create the calendar Day Heading & the calendar Day Cells
        tr = document.createElement('tr');
        td = document.createElement('td');
        self.calendar.celltable = document.createElement('table');
        setClass(self.calendar.celltable,'cells');
        self.calendar.celltable.appendChild(createDayHeading());
        self.calendar.celltable.appendChild(createCalCells());
        td.appendChild(self.calendar.celltable);
        tr.appendChild(td);
        tbody.appendChild(tr);

        //create the calendar footer
        tr = document.createElement('tr');
        td = document.createElement('td');
        td.appendChild(createFooter());
        tr.appendChild(td);
        tbody.appendChild(tr);

        //add the tbody element to the main calendar table
        self.calendar.appendChild(tbody);

        //and add the onmouseover events to the calendar table
        addEventHandler(self.calendar,'mouseover',cal_onmouseover);
        addEventHandler(self.calendar,'mouseout',cal_onmouseout);
    }
    //-----------------------------------------------------------------------------
    /**
    * Creates the primary calendar heading, with months & years
    */
    function createMainHeading() {
        //create the containing <div> element
        var container = document.createElement('div');
        setClass(container,'mainheading');
        //create the child elements and other variables
        self.monthSelect = document.createElement('select');
        self.yearSelect = document.createElement('select');
        var monthDn = document.createElement('input'), monthUp = document.createElement('input');
        var opt, i;
        //fill the month select box
        for(i=0;i<12;i++) {
            opt = document.createElement('option');
            opt.setAttribute('value',i);
            if(self.displayMonth == i) {
                opt.setAttribute('selected','selected');
            }
            opt.appendChild(document.createTextNode(self.months_sh[i]));
            self.monthSelect.appendChild(opt);
        }
        //and fill the year select box
        var yrMax = self.maxDate.getFullYear(), yrMin = self.minDate.getFullYear();
        for(i=yrMin;i<=yrMax;i++) {
            opt = document.createElement('option');
            opt.setAttribute('value',i);
            if(self.displayYear == i) {
                opt.setAttribute('selected','selected');
            }
            opt.appendChild(document.createTextNode(i));
            self.yearSelect.appendChild(opt);
        }
        //add the appropriate children for the month buttons
        monthUp.setAttribute('type','button');
        monthUp.setAttribute('value','>');
        monthUp.setAttribute('title',self.monthup_title);
        monthDn.setAttribute('type','button');
        monthDn.setAttribute('value','<');
        monthDn.setAttribute('title',self.monthdn_title);
        self.monthSelect.owner = self.yearSelect.owner = monthUp.owner = monthDn.owner = self;  //hack to allow us to access self calendar in the events (<fix>??)

        //assign the event handlers for the controls
        function selectonchange()   {
            if(self.goToMonth(self.yearSelect.value,self.monthSelect.value)) {
                self.displayMonth = self.monthSelect.value;
                self.displayYear = self.yearSelect.value;
            }
            else {
                self.monthSelect.value = self.displayMonth;
                self.yearSelect.value = self.displayYear;
            }
        }
        addEventHandler(monthUp,'click',function(){self.nextMonth();});
        addEventHandler(monthDn,'click',function(){self.prevMonth();});
        addEventHandler(self.monthSelect,'change',selectonchange);
        addEventHandler(self.yearSelect,'change',selectonchange);

        //and finally add the elements to the containing div
        container.appendChild(monthDn);
        container.appendChild(self.monthSelect);
        container.appendChild(self.yearSelect);
        container.appendChild(monthUp);
        return container;
    }
    //-----------------------------------------------------------------------------
    /**
    * Creates the footer of the calendar - goes under the calendar cells
    */
    function createFooter() {
        var container = document.createElement('div');
        var clearSelected = document.createElement('input');
        clearSelected.setAttribute('type','button');
        clearSelected.setAttribute('value',self.clearbtn_caption);
        clearSelected.setAttribute('title',self.clearbtn_title);
        clearSelected.owner = self;
        addEventHandler(clearSelected,'click',function() {self.resetSelections(false);});
        container.appendChild(clearSelected);
        if(self.mode == 'popup') {
            var closeBtn = document.createElement('input');
            closeBtn.setAttribute('type','button')
            closeBtn.setAttribute('value',self.closebtn_caption);
            closeBtn.setAttribute('title',self.closebtn_title);
            addEventHandler(closeBtn,'click',function(){self.hide();});
            setClass(closeBtn,'closeBtn');
            container.appendChild(closeBtn);
        }
        return container;
    }
    //-----------------------------------------------------------------------------
    /**
    * Creates the heading containing the day names
    */
    function createDayHeading() {
        //create the table element
        self.calHeading = document.createElement('thead');
        setClass(self.calHeading,'caldayheading');
        var tr = document.createElement('tr'), th;
        self.cols = new Array(false,false,false,false,false,false,false);

        //if we're showing the week headings, create an empty <td> for filler
        if(self.showWeeks) {
            th = document.createElement('th');
            setClass(th,'wkhead');
            tr.appendChild(th);
        }
        //populate the day titles
        for(var dow=0;dow<7;dow++) {
            th = document.createElement('th');
            th.appendChild(document.createTextNode(self.daynames[dow]));
            if(self.selectMultiple) { //if selectMultiple is true, assign the cell a CalHeading Object to handle all events
                th.headObj = new CalHeading(self,th,(dow + self.startDay < 7 ? dow + self.startDay : dow + self.startDay - 7));
            }
            tr.appendChild(th);
        }
        self.calHeading.appendChild(tr);
        return self.calHeading;
    }
    //-----------------------------------------------------------------------------
    /**
    * Creates the table containing the calendar day cells
    */
    function createCalCells() {
        self.rows = new Array(false,false,false,false,false,false);
        self.cells = new Array();
        var row = -1, totalCells = (self.showWeeks ? 48 : 42);
        var beginDate = new Date(self.displayYear,self.displayMonth,1);
        var endDate = new Date(self.displayYear,self.displayMonth,self.monthDayCount[self.displayMonth]);
        var sdt = new Date(beginDate);
        sdt.setDate(sdt.getDate() + (self.startDay - beginDate.getDay()) - (self.startDay - beginDate.getDay() > 0 ? 7 : 0) );
        //create the table element to hold the cells
        self.calCells = document.createElement('tbody');
        var tr,td;
        var cellIdx = 0, cell, week, dayval;

        for(var i=0;i<totalCells;i++) {
            if(self.showWeeks) { //if we are showing the week headings
                if(i % 8 == 0) {
                    row++;
                    week = sdt.getWeek(self.startDay);
                    tr = document.createElement('tr');
                    td = document.createElement('td');
                    if(self.selectMultiple) { //if selectMultiple is enabled, create the associated weekObj objects
                        td.weekObj = new WeekHeading(self,td,week,row)
                    }
                    else {//otherwise just set the class of the td for consistent look
                        setClass(td,'wkhead');
                    }
                    td.appendChild(document.createTextNode(week));
                    tr.appendChild(td);
                    i++;
                }
            }
            else if(i % 7 == 0) { //otherwise, new row every 7 cells
                row++;
                week = sdt.getWeek(self.startDay);
                tr = document.createElement('tr');
            }
            //create the day cells
            dayval = sdt.getDate();
            td = document.createElement('td');
            td.appendChild(document.createTextNode(dayval));
            cell = new CalCell(self,td,sdt,row,week);//,'normal',sdt.getTime() >= self.minDate.getTime() && sdt.getTime() <= self.maxDate.getTime());
            self.cells[cellIdx] = cell;
            td.cellObj = cell;
            tr.appendChild(td);
            self.calCells.appendChild(tr);
            self.reDraw(cellIdx++); //and paint the cell according to its properties
            sdt.setDate(dayval + 1); //increment the date
        }
        return self.calCells;
    }
    //-----------------------------------------------------------------------------
    /**
    * Runs all the operations necessary to change the mode of the calendar
    * @param HTMLInputElement targetelement
    */
    function setMode(targetelement) {
        if(self.mode == 'popup') { //set positioning to absolute for popup
            self.calendar.style.position = 'absolute';
        }
        //if a target element has been set, append the calendar to it
        if(targetelement) {
            switch(self.mode) {
                case 'flat':
                    self.tgt = targetelement;
                    self.tgt.appendChild(self.calendar);
                    self.visible = true;
                    break;
                case 'popup':
                    self.calendar.style.position = 'absolute';
                    document.body.appendChild(self.calendar);
                    self.setTarget(targetelement,false);
                    break;
            }
        }
        else { //otherwise, add the calendar to the document.body (useful if targetelement will not be defined until after the calendar is initialized)
            document.body.appendChild(self.calendar);
            self.visible = false;
        }
    }
    //-----------------------------------------------------------------------------
    /**
    * Removes the calendar table cells from the DOM (does not delete the cell objects associated with them)
    */
    function deleteCells() {
        self.calendar.celltable.removeChild(self.calendar.celltable.childNodes[1]); //remove the tbody element from the cell table
    }
    //-----------------------------------------------------------------------------
    /**
    * Sets the CSS class of the element, W3C & IE
    * @param HTMLElement element
    * @param string className
    */
    function setClass(element,className) {
        element.setAttribute('class',className);
        element.setAttribute('className',className); //<iehack>
    }
    /**
    * Updates a cell's data, including css class and selection properties
    * @param int cellindex
    */
    function setCellProperties(cellindex) {
        var cell = self.cells[cellindex];
        var date;
        idx = self.dateInArray(self.dates,cell.date);
        if(idx > -1) {
            date = self.dates[idx]; //reduce indirection
            cell.date.selected = date.selected || false;
            cell.date.type = date.type;
            cell.date.canSelect = date.canSelect;
            cell.setTitle(date.title);
            cell.setURL(date.href);
            cell.setHTML(date.cellHTML);
        }
        else {
            cell.date.selected = false; //if the cell's date isn't in the dates array, set it's selected value to false
        }
        //make all cells lying outside the min and max dates un-selectable
        if(cell.date.getTime() < self.minDate.getTime() || cell.date.getTime() > self.maxDate.getTime()) {
            cell.date.canSelect = false;
        }
        cell.setClass();
    }
    //-----------------------------------------------------------------------------
    function cal_onmouseover() {
        self.mousein = true;
    }
    //-----------------------------------------------------------------------------
    function cal_onmouseout()   {
        self.mousein = false;
    }
    //-----------------------------------------------------------------------------
    /**
     * Updates the calendar's selectedDates pointer array
     */
    function updateSelectedDates() {
        var idx = 0;
        self.selectedDates = new Array();
        for(i=0;i<self.dates.length;i++) {
            if(self.dates[i].selected) {
                self.selectedDates[idx++] = self.dates[i];
            }
        }
    }
    //PUBLIC METHODS
    //-----------------------------------------------------------------------------
    /**
    * Find a date in the given array, returning its index if found, -1 if not
    * @param array arr
    * @param Date searchVal
    * @param int startIndex
    * @return int
    */
    self.dateInArray = function(arr,searchVal,startIndex) {
        startIndex = (startIndex != null ? startIndex : 0); //default startIndex to 0, if not set
        for(var i=startIndex;i<arr.length;i++) {
            if(searchVal.getUeDay() == arr[i].getUeDay()) {
                return i;
            }
        }
        return -1;
    };
    //-----------------------------------------------------------------------------
    /**
    * Changes the target element of this calendar to another input.
    * Many thanks to Jake Olefsky - jake@olefsky.com
    * @param HTMLInputElement targetelement
    * @param bool focus
    */
    self.setTarget = function (targetelement, focus)
    {
        //if this is a popup calendar
        if(self.mode == 'popup') {
            //declare the event handlers for the target element
            function popupFocus() {
                self.show();
            }
            function popupBlur() {
                if(!self.mousein){
                    self.hide();
                }
            }
            function popupKeyDown() {
                self.hide();
            }
            //unset old target element event handlers (if there is one yet)
            if(self.tgt) {
                removeEventHandler(self.tgt,'focus',popupFocus);
                removeEventHandler(self.tgt,'blur',popupBlur);
                removeEventHandler(self.tgt,'keydown',popupKeyDown);
            }
            //and set the new target element
            self.tgt = targetelement;
            //create a pointer to the INPUT's date object and init the new data array
            var dto = self.tgt.dateObj,pdateArr = new Array; 
            //if a date is set for the target element
            if(dto) {
                if(self.tgt.value.length) { //load it into the calendar...
                    pdateArr[0] = dto;
                }
                self.goToMonth(dto.getFullYear(),dto.getMonth()); //...and go to the target's month/year
            }
            self.selectDates(pdateArr,true,true,true);

            self.topOffset = self.tgt.offsetHeight; // the vertical distance (in pixels) to display the calendar from the Top of its input element
            self.leftOffset = 0;                    // the horizontal distance (in pixels) to display the calendar from the Left of its input element
            self.updatePos(self.tgt);
            //and add the event handlers to the new element
            addEventHandler(self.tgt,'focus',popupFocus);
            addEventHandler(self.tgt,'blur',popupBlur);
            addEventHandler(self.tgt,'keydown',popupKeyDown);
            if(focus !== false) { //focus the target element immediately, unless otherwise specified
                popupFocus();
            }
        }
        else { //if this is a flat or inline calendar
            //if the target is already set, remove the calendar's DOM representation from it
            if(self.tgt) {
                self.tgt.removeChild(self.calendar);
            }
            //now, set the calendar's target to the new target element, and show the calendar
            self.tgt = targetelement;
            self.tgt.appendChild(self.calendar);
            self.show();
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Go to the next month.  if the month is December, go to January of the next year
    * Returns true if the month will be incremented
    * @return bool
    */
    self.nextMonth = function () {
        var month = self.displayMonth;
        var year = self.displayYear;
        //increment the month/year values, provided they're within the min/max ranges
        if(self.displayMonth < 11) { //i.e. if currently in the year
            month++;
        }
        else if(self.yearSelect.value < self.maxDate.getFullYear()) { //if not, increment the year as well
            month = 0;
            year++;
        }
        return self.goToMonth(year,month);
    };
    //-----------------------------------------------------------------------------
    /**
    * Go to the previous month - if the month is January, go to December of the previous year.
    * Returns true if the month will be decremented
    * @return bool
    */
    self.prevMonth = function () {
        var month = self.displayMonth;
        var year = self.displayYear;
        //increment the month/year values, provided they're within the min/max ranges
        if(self.displayMonth > 0) { //i.e. if currently in the year
            month--;
        }
        else { //if not, decrement the year as well
            month = 11;
            year--;
        }
        return self.goToMonth(year,month);
    };
    //-----------------------------------------------------------------------------
    /**
    * Sets the calendar to display the requested month/year, returning true if the
    * date is within the minimum and maximum allowed dates
    * @param int year
    * @param int month
    * @return bool
    */
    self.goToMonth = function (year,month) {
        var testdatemin = new Date(year, month, 31);
        var testdatemax = new Date(year, month, 1);
        if(testdatemin >= self.minDate && testdatemax <= self.maxDate) {
            self.monthSelect.value = self.displayMonth = month;
            self.yearSelect.value = self.displayYear = year;
            //recreate the calendar for the new month
            createCalCells();
            deleteCells();
            self.calendar.celltable.appendChild(self.calCells);
            return true;
        }
        else {
            alert(self.maxrange_caption);
            return false;
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Moves the calendar's position to the target element's location (popup mode only)
    */
    self.updatePos = function (target) {
        if(self.mode == 'popup') {
            self.calendar.style.top = getTop(target) + self.topOffset + 'px';
            self.calendar.style.left = getLeft(target) + self.leftOffset + 'px';
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Displays the calendar
    */
    self.show = function () {
        self.updatePos(self.tgt); //update the calendar position, in case the page layout has changed since loading
        self.calendar.style.display = 'block'; //'table'; //<iehack> 'table' is the W3C-recommended spec, but IE isn't a fan of those
        self.visible = true;
    };
    //-----------------------------------------------------------------------------
    /**
    * Hides the calendar
    */
    self.hide = function () {
        self.calendar.style.display = 'none';
        self.visible = false;
    };
    //-----------------------------------------------------------------------------
    /**
    * Toggles (shows/hides) the calendar depending on its current state
    */
    self.toggle = function () {
        self.visible ? self.hide() : self.show();
    };
    //-----------------------------------------------------------------------------
    /**
    * Adds the array "dates" to the calendar's dates array, removing duplicate dates,
    * and redraws the calendar if redraw is true
    * @param array dates
    * @param bool redraw
    */
    self.addDates = function (dates,redraw) {
        var i;
        for(i=0;i<dates.length;i++) {
            if(self.dateInArray(self.dates,dates[i]) == -1) { //if the date isn't already in the array, add it!
                self.dates[self.dates.length] = dates[i];
            }
        }
        //now rebuild the selectedDates pointer array
        updateSelectedDates();
        if(redraw != false) { //redraw  the calendar if "redraw" is false or undefined
            self.reDraw();
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Removes the dates from the calendar's dates array and redraws the calendar
    * if redraw is true
    * @param array dates
    * @param bool redraw
    */
    self.removeDates = function (dates,redraw) {
        var idx;
        for(var i=0;i<dates.length;i++) {
            idx = self.dateInArray(self.dates,dates[i]);
            if(idx != -1) { //search for the dates in the dates array, removing them if the dates match
                self.dates.splice(idx,1);
            }
        }
        updateSelectedDates();
        if(redraw != false) { //redraw  the calendar if "redraw" is true or undefined
            self.reDraw();
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Selects or Deselects an array of dates
    * @param Array inpdates
    * @param bool selectVal
    * @param bool redraw
    * @param bool removeothers
    */
    self.selectDates = function (inpdates,selectVal,redraw,removeothers) {
        var i, idx;
        if(removeothers == true) {
            for(i=0;i<self.dates.length;i++) {
                self.dates[i].selected = false;
            }
        }
        for(i=0;i<inpdates.length;i++) {
            idx = self.dateInArray(self.dates,inpdates[i]);
            if(selectVal == true) {
                inpdates[i].selected = true;
                if(idx == -1) { //if the date does not exist in the calendar's dates array, add it
                    self.dates[self.dates.length] = inpdates[i];
                }
                else { //if not, just select it
                    self.dates[idx].selected = true;
                }
            }
            else { //if deselecting...
                if(idx > -1) { //if the date is found, deselect and/or remove it from the calendar's dates array
                    self.dates[idx].selected = inpdates[i].selected = false;
                    if(self.dates[idx].type == 'normal') { //remove 'normal' dates from the dates array, since they're useless unless selected
                        self.dates.splice(idx,1);
                    }
                }
            }
        }
        //now rebuild the selectedDates pointer array
        updateSelectedDates();
        if(redraw != false) { //redraw the calendar if "redraw" is false or undefined
            self.reDraw();
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Adds the dates in dates as hidden inputs to the form "form".  inputname
    * is the name of each hidden element
    * @param string form
    * @param string inputname
    */
    self.sendForm = function(form,inputname) {
        var inp = inputname || 'epochdates';
        for(var i=0;i<self.dates.length;i++)
        {
            inp = document.createElement('input');
            inp.setAttribute('type','hidden');
            inp.setAttribute('name',inputname + '[]');
            inp.setAttribute('value',encodeURIComponent(self.dates[i].dateFormat('Y-m-d')));  //default to the ISO date format
            form.appendChild(inp);
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Erases the dates array and resets the calendar's selection variables to defaults.
    * If retMonth is true, the calendar will return to the initial default month/year
    * @param bool retMonth
    */
    self.resetSelections = function (retMonth) {
        var dateArray = new Array();
        var dt = self.dates;
        for(var i=0;i<dt.length;i++) {
            if(dt[i].selected) {
               dateArray[dateArray.length] = dt[i];
            }
        }
        self.selectDates(dateArray,false,false);
        self.rows = new Array(false,false,false,false,false,false,false);
        self.cols = new Array(false,false,false,false,false,false,false);
        if(self.mode == 'popup') { //hide the calendar and clear the input element if in popup mode
            self.tgt.value = '';
            self.hide();
        }
        retMonth == true ? self.goToMonth(self.displayYearInitial,self.displayMonthInitial) : self.reDraw();
    };
    //-----------------------------------------------------------------------------
    /**
    * Reapplies all the CSS classes for the calendar cells - usually called after changing their state
    * If index is specified, it will redraw that cell only.
    * @param int index
    */
    self.reDraw = function (index) {
        self.state = 1;
        var len = index ? index + 1 : self.cells.length;
        for(var i = index || 0;i<len;i++) {
            setCellProperties(i);
        }
        self.state = 2;
    };
    //-----------------------------------------------------------------------------
    /**
    * Returns the index of the cell whose date value matches "date", or -1 if not found
    * @param Date date
    * @return int
    */
    self.getCellIndex = function(date) {
        for(var i=0;i<self.cells.length;i++) {
            if(self.cells[i].date.getUeDay() == date.getUeDay()) {
                return i;
            }
        }
        return -1;
    };
    //-----------------------------------------------------------------------------
    //begin constructor code:

    //PUBLIC VARIABLES
    self.state = 0;
    self.name = name;
    self.curDate = new Date();
    self.mode = mode;
    self.selectMultiple = (multiselect == true); //'false' if not true or not set at all
    //the various calendar variables
    self.dates = new Array();
    self.selectedDates = new Array();

    self.calendar;
    self.calHeading;
    self.calCells;
    self.rows;
    self.cols;
    self.cells = new Array();
    //The controls
    self.monthSelect;
    self.yearSelect;
    self.mousein = false;

    //Initialize the calendar and its variables{
    calConfig();
    setLang();
    setDays();
    createCalendar(); //create the calendar DOM element and its children, and their related objects
    setMode(targetelement);
    self.state = 2; //0: initializing, 1: redrawing, 2: finished!
    self.visible ? self.show() : self.hide();
}
//-----------------------------------------------------------------------------
/*****************************************************************************/
/**
* Object that contains the methods and properties for the calendar day headings
*/
function CalHeading(owner,tableCell,dayOfWeek) {
    //-----------------------------------------------------------------------------
    function DayHeadingonclick() {//selects/deselects the days for this object's day of week
        //reduce indirection:
        var sdates = owner.dates;
        var cells = owner.cells;
        var dateArray = new Array();
        owner.cols[dayOfWeek] = !owner.cols[dayOfWeek];
        for(var i=0;i<cells.length;i++) { //cycle through all the cells in the calendar, selecting all cells with the same dayOfWeek as this heading
            if(cells[i].dayOfWeek == dayOfWeek && cells[i].date.canSelect && (!owner.selCurMonthOnly || cells[i].date.getMonth() == owner.displayMonth && cells[i].date.getFullYear() == owner.displayYear)) { //if the cell's DoW matches, with other conditions
                dateArray[dateArray.length] = cells[i].date;
            }
        }
        owner.selectDates(dateArray,owner.cols[dayOfWeek],true);
    }
    //-----------------------------------------------------------------------------
    var self = this;
    self.dayOfWeek = dayOfWeek;
    addEventHandler(tableCell,'mouseup',DayHeadingonclick);
}
/*****************************************************************************/
/**
* Object that contains the methods and properties for the calendar week headings
*/
function WeekHeading(owner,tableCell,week,tableRow) {
    //-----------------------------------------------------------------------------
    function weekHeadingonclick() {
        //reduce indirection:
        var cells = owner.cells;
        var sdates = owner.dates;
        var dateArray = new Array();
        owner.rows[tableRow] = !owner.rows[tableRow];
        for(var i=0;i<cells.length;i++) {
            if(cells[i].tableRow == tableRow && cells[i].date.canSelect && (!owner.selCurMonthOnly || cells[i].date.getMonth() == owner.displayMonth && cells[i].date.getFullYear() == owner.displayYear)) { //if the cell's DoW matches, with other conditions)
                dateArray[dateArray.length] = cells[i].date;
            }
        }
        owner.selectDates(dateArray,owner.rows[tableRow],true);
    }
    //-----------------------------------------------------------------------------
    var self = this;
    self.week = week;
    tableCell.setAttribute('class','wkhead');
    tableCell.setAttribute('className','wkhead'); //<iehack>
    addEventHandler(tableCell,'mouseup',weekHeadingonclick);
}
/*****************************************************************************/
/**
* Object that holds all data & code related to a calendar cell
*/
/**
 * The CalCell constructor function
 * @param Epoch owner
 * @param HTMLTableCellElement tableCell
 * @param Date dateObj
 * @param int row
 * @param int week
 */
function CalCell(owner,tableCell,dateObj,row,week) {
    var self = this;
    //-----------------------------------------------------------------------------
    function calCellonclick() {
        
        if(self.date.canSelect) {
            if(owner.selectMultiple == true) { //if we can select multiple cells simultaneously, add the currently selected self's date to the dates array
                owner.selectDates(new Array(self.date),!self.date.selected,false);
                self.setClass(); //update the current cell's style to reflect the changes - a full redraw isn't necessary
            }
            else { //if we can only select one date at a time
                owner.selectDates(new Array(self.date),true,false,true);
                if(owner.mode == 'popup') { //update the target element's value and hide the calendar if in popup mode
                    owner.tgt.value = self.date.dateFormat(); //use the default date format defined in dateFormat
                    owner.tgt.dateObj = new Date(self.date); //add a Date object to the target element for later reference
                    owner.hide();
                }
                owner.reDraw(); //redraw all the calendar cells
            }
        }
    }
    //-----------------------------------------------------------------------------
    /**
    * Replicate the CSS :hover effect for non-supporting browsers <iehack>
    */
    function calCellonmouseover() {
        if(self.date.canSelect) {
            tableCell.setAttribute('class',self.cellClass + ' hover');
            tableCell.setAttribute('className',self.cellClass + ' hover');
        }
    }
    //-----------------------------------------------------------------------------
    /**
    * Replicate the CSS :hover effect for non-supporting browsers <iehack>
    */
    function calCellonmouseout() {
        self.setClass();
    }
    //-----------------------------------------------------------------------------
    /**
    * Sets the CSS class of the cell based on the specified criteria
    */
    self.setClass = function ()
    {
        if(self.date.canSelect !== false) {
            if(self.date.selected) {
                self.cellClass = 'cell_selected';
            }
            else if(owner.displayMonth != self.date.getMonth() ) {
                self.cellClass = 'notmnth';
            }
            else if(self.date.type == 'holiday') {
                self.cellClass = 'hlday';
            }
            else if(self.dayOfWeek > 0 && self.dayOfWeek < 6) {
                self.cellClass = 'wkday';
            }
            else {
                self.cellClass = 'wkend';
            }
        }
        else {
            self.cellClass = 'noselect';
        }
        //highlight the current date
        if(self.date.getUeDay() == owner.curDate.getUeDay()) {
            self.cellClass = self.cellClass + ' curdate';
        }
        tableCell.setAttribute('class',self.cellClass);
        tableCell.setAttribute('className',self.cellClass); //<iehack>
    };
    //-----------------------------------------------------------------------------
    /**
    * Sets the cell's hyperlink, if declared
    * @param string href
    * @param string type ('anchor' or 'js' - default 'anchor')
    */
    self.setURL = function(href,type) {
        if(href) {
            if(type == 'js') { //Make the WHOLE cell be a clickable link
                addEventHandler(self.tableCell,'mousedown',function(){window.location.href = href;});
            }
            else { //make only the date number of the cell a clickable link:
                var url = document.createElement('a');
                url.setAttribute('href',href);
                url.appendChild(document.createTextNode(self.date.getDate()));
                self.tableCell.replaceChild(url,self.tableCell.firstChild); //assumes the first child of the cell DOM node is the date text
            }
        }
    }
    //-----------------------------------------------------------------------------
    /**
    * Sets the title (i.e. tooltip) that appears when a user holds their mouse cursor over a cell
    * @param string titleStr
    */
    self.setTitle = function(titleStr) {
        if(titleStr && titleStr.length > 0) {
            self.title = titleStr;
            self.tableCell.setAttribute('title',titleStr);
        }
    };
    //-----------------------------------------------------------------------------
    /**
    * Sets the internal html of the cell, using a string containing html markup
    * @param string html
    */
    self.setHTML = function(html) {
        if(html && html.length > 0) {
            if(self.tableCell.childNodes[1]) {
                self.tableCell.childNodes[1].innerHTML = html;
            }
            else {
                var htmlCont = document.createElement('div');
                htmlCont.innerHTML = html;
                self.tableCell.appendChild(htmlCont);
            }
        }
    };
    //-----------------------------------------------------------------------------
    self.cellClass;         //the CSS class of the cell
    self.tableRow = row;
    self.tableCell = tableCell;
    self.date = new Date(dateObj);
    self.date.canSelect = true; //whether this cell can be selected or not - always true unless set otherwise externally
    self.date.type = 'normal';  //i.e. normal date, holiday, etc - always true unless set otherwise externally
    self.date.selected = false; //whether the cell is selected (and is therefore stored in the owner's dates array)
    self.date.cellHTML = '';
    self.dayOfWeek = self.date.getDay();
    self.week = week;
    //assign the event handlers for the table cell element
    addEventHandler(tableCell,'click', calCellonclick);
    addEventHandler(tableCell,'mouseover', calCellonmouseover);
    addEventHandler(tableCell,'mouseout', calCellonmouseout);
    self.setClass();
}
/*****************************************************************************/
Date.prototype.getDayOfYear = function () //returns the day of the year for this date
{
    return parseInt((this.getTime() - new Date(this.getFullYear(),0,1).getTime())/86400000 + 1);
};
//-----------------------------------------------------------------------------
/**
 * Returns the week number for this date.  dowOffset is the day of week the week
 * "starts" on for your locale - it can be from 0 to 6. If dowOffset is 1 (Monday),
 * the week returned is the ISO 8601 week number.
 * @param int dowOffset
 * @return int
 */
Date.prototype.getWeek = function (dowOffset) {
    dowOffset = typeof(dowOffset) == 'int' ? dowOffset : 0; //default dowOffset to zero
    var newYear = new Date(this.getFullYear(),0,1);
    var day = newYear.getDay() - dowOffset; //the day of week the year begins on
    day = (day >= 0 ? day : day + 7);
    var weeknum, daynum = Math.floor((this.getTime() - newYear.getTime() - (this.getTimezoneOffset()-newYear.getTimezoneOffset())*60000)/86400000) + 1;
    //if the year starts before the middle of a week
    if(day < 4) {
        weeknum = Math.floor((daynum+day-1)/7) + 1;
        if(weeknum > 52) {
            nYear = new Date(this.getFullYear() + 1,0,1);
            nday = nYear.getDay() - dowOffset;
            nday = nday >= 0 ? nday : nday + 7;
            weeknum = nday < 4 ? 1 : 53; //if the next year starts before the middle of the week, it is week #1 of that year
        }
    }
    else {
        weeknum = Math.floor((daynum+day-1)/7);
    }
    return weeknum;
};
//-----------------------------------------------------------------------------
Date.prototype.getUeDay = function () //returns the number of DAYS since the UNIX Epoch - good for comparing the date portion
{
    return parseInt(Math.floor((this.getTime() - this.getTimezoneOffset() * 60000)/86400000)); //must take into account the local timezone
};
//-----------------------------------------------------------------------------
Date.prototype.dateFormat = function(format)
{
    if(!format) { // the default date format to use - can be customized to the current locale
        format = 'd/m/Y';
    }
    LZ = function(x) {return(x < 0 || x > 9 ? '' : '0') + x};
    var MONTH_NAMES = new Array('January','February','March','April','May','June','July','August','September','October','November','December','Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');
    var DAY_NAMES = new Array('Sunday','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday','Sun','Mon','Tue','Wed','Thu','Fri','Sat');
    var result="";
    var i_format=0;
    var c="";
    var token="";
    var y=this.getFullYear().toString();
    var M=this.getMonth()+1;
    var d=this.getDate();
    var E=this.getDay();
    var H=this.getHours();
    var m=this.getMinutes();
    var s=this.getSeconds();
    value = {
        Y: y.toString(),
        y: y.substring(2),
        n: M,
        m: LZ(M),
        F: MONTH_NAMES[M-1],
        M: MONTH_NAMES[M+11],
        j: d,
        d: LZ(d),
        D: DAY_NAMES[E+7],
        l: DAY_NAMES[E],
        G: H,
        H: LZ(H)
    };
    if (H==0) {value['g']=12;}
    else if (H>12){value['g']=H-12;}
    else {value['g']=H;}
    value['h']=LZ(value['g']);
    if (H > 11) {value['a']='pm'; value['A'] = 'PM';}
    else { value['a']='am'; value['A'] = 'AM';}
    value['i']=LZ(m);
    value['s']=LZ(s);
    //construct the result string
    while (i_format < format.length) {
        c=format.charAt(i_format);
        token="";
        while ((format.charAt(i_format)==c) && (i_format < format.length)) {
            token += format.charAt(i_format++);
        }
        if (value[token] != null) { result=result + value[token]; }
        else { result=result + token; }
    }
    return result;
};
/*****************************************************************************/
//-----------------------------------------------------------------------------
function addEventHandler(element, type, func) { //unfortunate hack to deal with Internet Explorer's horrible DOM event model <iehack>
    if(element.addEventListener) {
        element.addEventListener(type,func,false);
    }
    else if (element.attachEvent) {
        element.attachEvent('on'+type,func);
    }
}
//-----------------------------------------------------------------------------
function removeEventHandler(element, type, func) { //unfortunate hack to deal with Internet Explorer's horrible DOM event model <iehack>
    if(element.removeEventListener) {
        element.removeEventListener(type,func,false);
    }
    else if (element.attachEvent) {
        element.detachEvent('on'+type,func);
    }
}
//-----------------------------------------------------------------------------
function getTop(element) {//returns the absolute Top value of element, in pixels
    var oNode = element;
    var iTop = 0;

    while(oNode.tagName != 'HTML') {
        iTop += oNode.offsetTop || 0;
        if(oNode.offsetParent) { //i.e. the parent element is not hidden
            oNode = oNode.offsetParent;
        }
        else {
            break;
        }
    }
    return iTop;
}
//-----------------------------------------------------------------------------
function getLeft(element) { //returns the absolute Left value of element, in pixels
    var oNode = element;
    var iLeft = 0;
    while(oNode.tagName != 'HTML') {
        iLeft += oNode.offsetLeft || 0;
        if(oNode.offsetParent) { //i.e. the parent element is not hidden
            oNode = oNode.offsetParent;
        }
        else {
            break;
        }
    }
    return iLeft;
}
//-----------------------------------------------------------------------------