//
// calendar -- a javascript date picker designed for easy localization.
//
//
//
// Author: Per Norrman (pernorrman@telia.com)
// 
// Based on Tapestry 2.3-beta1 Datepicker by Paul Geerts
// 
// Thanks to:
//     Vladimir [vyc@quorus-ms.ru] for fixing the IE6 zIndex problem.
//
// The normal setup would be to have one text field for displaying the 
// selected date, and one button to show/hide the date picker control.
// This is  the recommended javascript code:
// 
//	<script language="javascript">
//		var cal;
//
//		function init() {
//			cal = new Calendar();
//			cal.setIncludeWeek(true);
//			cal.setFormat("yyyy-MM-dd");
//			cal.setMonthNames(.....);
//			cal.setShortMonthNames(....);
//			cal.create();
//			
//			document.form.button1.onclick = function() {
//				cal.toggle(document.form.button1);
//			}
//			cal.onchange = function() {
//				document.form.textfield1.value  = cal.formatDate();
//			}
//		}
//	</script>
//
// The init function is invoked when the body is loaded.
//
//

function Calendar(date) {
    if (arguments.length == 0) {
        this._currentDate = new Date();
        this._selectedDate = null;
    }
    else {
        this._currentDate = new Date(date);
        this._selectedDate = new Date(date);
    }

    // Accumulated days per month, for normal and for leap years.
    // Used in week number calculations.
    Calendar.NUM_DAYS = [0,31,59,90,120,151,181,212,243,273,304,334];

    Calendar.LEAP_NUM_DAYS = [0,31,60,91,121,152,182,213,244,274,305,335];

    this.startyear = 2000;
    this.lastyear = 2050;
    this._bw = new bw_check();
    this._showing = false;
    this._includeWeek = false;
    this._hideOnSelect = true;
    this._alwaysVisible = false;


    this._dateSlot = new Array(42);
    this._weekSlot = new Array(6);

    this._firstDayOfWeek = 1;
    this._minimalDaysInFirstWeek = 4;

    this._monthNames = [
        "January",        "February",        "March",    "April",
        "May",            "June",            "July",        "August",
        "September",    "October",        "November",    "December"
    ];

    this._shortMonthNames = [
        "jan", "feb", "mar", "apr", "may", "jun",
        "jul", "aug", "sep", "oct", "nov", "dec"
    ];

    // Week days start with Sunday=0, ... Saturday=6
    this._weekDayNames = [
        "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
    ];

    this._shortWeekDayNames =
    ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" ];

    this._defaultFormat = "yyyy-MM-dd";

    this._format = this._defaultFormat;

    this._calDiv = null;

    this._clearButtonLabel = "Clear";
    this._closeButtonLabel = "Close";

}

/**
 *    CREATE the Calendar DOM element
 */
Calendar.prototype.create = function() {
    var div;
    var table;
    var tbody;
    var tr;
    var td;
    var dp = this;

    // Create the top-level div element
    this._calDiv = document.createElement("div");
    this._calDiv.className = "calendar";
    this._calDiv.style.position = "absolute";
    this._calDiv.style.display = "none";
    this._calDiv.style.border = "1px solid WindowText";
    this._calDiv.style.textAlign = "center";
    this._calDiv.style.background = "Window";
    this._calDiv.style.zIndex = "400";


    // header div
    div = document.createElement("div");
    div.className = "calendarHeader";
    div.style.background = "ActiveCaption";
    div.style.padding = "3px";
    div.style.borderBottom = "1px solid WindowText";
    this._calDiv.appendChild(div);

    table = document.createElement("table");
    table.style.cellSpacing = 0;
    div.appendChild(table);

    tbody = document.createElement("tbody");
    table.appendChild(tbody);

    tr = document.createElement("tr");
    tbody.appendChild(tr);

    // Previous Month Button
    td = document.createElement("td");
    this._previousMonth = document.createElement("button");
    this._previousMonth.className = "prevMonthButton"
    this._previousMonth.appendChild(document.createTextNode("<<"));
    //this._previousMonth.appendChild(document.createTextNode(String.fromCharCode(9668)));
    td.appendChild(this._previousMonth);
    tr.appendChild(td);


    //
    // Create the month drop down
    //
    td = document.createElement("td");
    td.className = "labelContainer";
    tr.appendChild(td);

    this._yearSelect = document.createElement("select");
    for (var i = this.startyear; i < this.lastyear; ++i) {
        var opt = document.createElement("option");
        opt.innerHTML = i;
        opt.value = i;
        if (i == this._currentDate.getFullYear()) {
            opt.selected = false;
        }
        this._yearSelect.appendChild(opt);
    }
    td.appendChild(this._yearSelect);

    //
    // Create the year drop down
    //
    td = document.createElement("td");
    td.className = "labelContainer";
    tr.appendChild(td);
    this._monthSelect = document.createElement("select");
    for (var i = 0; i < this._monthNames.length; i++) {
        var opt = document.createElement("option");
        opt.innerHTML = this._monthNames[i];
        opt.value = i;
        if (i == this._currentDate.getMonth()) {
            opt.selected = true;
        }
        this._monthSelect.appendChild(opt);
    }
    td.appendChild(this._monthSelect);


    td = document.createElement("td");
    this._nextMonth = document.createElement("button");
    this._nextMonth.appendChild(document.createTextNode(">>"));
    //this._nextMonth.appendChild(document.createTextNode(String.fromCharCode(9654)));
    this._nextMonth.className = "nextMonthButton";
    td.appendChild(this._nextMonth);
    tr.appendChild(td);

    // Calendar body
    div = document.createElement("div");
    div.className = "calendarBody";
    this._calDiv.appendChild(div);
    this._table = div;

    // Create the inside of calendar body

    var text;
    table = document.createElement("table");
    //table.style.width="100%";
    table.className = "grid";
    table.style.font = "small-caption";
    table.style.fontWeight = "normal";
    table.style.textAalign = "center";
    table.style.color = "WindowText";
    table.style.cursor = "default";
    table.cellPadding = "3";
    table.cellSpacing = "0";

    div.appendChild(table);
    var thead = document.createElement("thead");
    table.appendChild(thead);
    tr = document.createElement("tr");
    thead.appendChild(tr);

    // weekdays header
    if (this._includeWeek) {
        td = document.createElement("th");
        text = document.createTextNode("w");
        td.appendChild(text);
        td.className = "weekNumberHead";
        td.style.textAlign = "left";
        tr.appendChild(td);
    }
    for (i = 0; i < 7; ++i) {
        td = document.createElement("th");
        text = document.createTextNode(this._shortWeekDayNames[(i + this._firstDayOfWeek) % 7]);
        td.appendChild(text);
        td.className = "weekDayHead";
        td.style.fontWeight = "bold";
        td.style.borderBottom = "1px solid WindowText";
        tr.appendChild(td);
    }

    // Date grid
    tbody = document.createElement("tbody");
    table.appendChild(tbody);

    for (week = 0; week < 6; ++week) {
        tr = document.createElement("tr");
        tbody.appendChild(tr);

        if (this._includeWeek) {
            td = document.createElement("td");
            td.className = "weekNumber";
            td.style.fontWeight = "normal";
            td.style.borderRight = "1px solid WindowText";
            td.style.textAlign = "left";
            text = document.createTextNode(String.fromCharCode(160));
            td.appendChild(text);
            //setCursor(td);
            td.align = "center";
            tr.appendChild(td);
            var tmp = new Object();
            tmp.tag = "WEEK";
            tmp.value = -1;
            tmp.data = text;
            this._weekSlot[week] = tmp;
        }

        for (day = 0; day < 7; ++day) {
            td = document.createElement("td");
            text = document.createTextNode(String.fromCharCode(160));
            td.appendChild(text);
            setCursor(td);
            td.align = "center";
            td.style.fontWeight = "normal";

            tr.appendChild(td);
            var tmp = new Object();
            tmp.tag = "DATE";
            tmp.value = -1;
            tmp.data = text;
            this._dateSlot[(week * 7) + day] = tmp;

        }
    }

    // Calendar Footer
    div = document.createElement("div");
    div.className = "calendarFooter";
    this._calDiv.appendChild(div);

    table = document.createElement("table");
    //table.style.width="100%";
    table.className = "footerTable";
    table.cellSpacing = 0;
    div.appendChild(table);

    tbody = document.createElement("tbody");
    table.appendChild(tbody);

    tr = document.createElement("tr");
    tbody.appendChild(tr);

    //
    // The TODAY button
    //
    td = document.createElement("td");
    this._todayButton = document.createElement("button");
    var today = new Date();
    var buttonText = today.getFullYear() + "-" + (today.getMonth() + 1) + "-" + today.getDate() + "";
    this._todayButton.appendChild(document.createTextNode(buttonText));
    td.appendChild(this._todayButton);
    tr.appendChild(td);

    //
    // The CLEAR button
    //
    td = document.createElement("td");
    this._clearButton = document.createElement("button");
    var today = new Date();
    this._clearButton.appendChild(document.createTextNode(this._clearButtonLabel));
    td.appendChild(this._clearButton);
    tr.appendChild(td);

    //
    // The close button
    //
    td = document.createElement("td");
    var closebutton = document.createElement("button");
    closebutton.appendChild(document.createTextNode(this._closeButtonLabel));
    td.appendChild(closebutton);
    tr.appendChild(td);

    this._update();
    this._updateHeader();


    // IE55+ extension
    this._previousMonth.hideFocus = true;
    this._nextMonth.hideFocus = true;
    this._todayButton.hideFocus = true;
    // end IE55+ extension

    // hook up events
    // buttons
    this._previousMonth.onclick = function () {
        dp.prevMonth();
    };

    this._nextMonth.onclick = function () {
        dp.nextMonth();
    };

    this._todayButton.onclick = function () {
        dp.setSelectedDate(new Date());
        dp.hide();
    };

    this._clearButton.onclick = function () {
        dp.clearSelectedDate();
        dp.hide();
    };


    this._calDiv.onselectstart = function () {
        return false;
    };

    this._table.onclick = function (e) {
        // find event
        if (e == null) e = document.parentWindow.event;

        // find td
        var el = e.target != null ? e.target : e.srcElement;
        while (el.nodeType != 1)
            el = el.parentNode;
        while (el != null && el.tagName && el.tagName.toLowerCase() != "td")
            el = el.parentNode;

        // if no td found, return
        if (el == null || el.tagName == null || el.tagName.toLowerCase() != "td")
            return;

        var d = new Date(dp._currentDate);
        var n = Number(el.firstChild.data);
        if (isNaN(n) || n <= 0 || n == null)
            return;

        if (el.className == "weekNumber")
            return;

        d.setDate(n);
        dp.setSelectedDate(d);

        if (!dp._alwaysVisible && dp._hideOnSelect) {
            dp.hide();
        }

    };


    this._calDiv.onkeydown = function (e) {
        if (e == null) e = document.parentWindow.event;
        var kc = e.keyCode != null ? e.keyCode : e.charCode;

        if (kc == 13) {
            var d = new Date(dp._currentDate).valueOf();
            dp.setSelectedDate(d);

            if (!dp._alwaysVisible && dp._hideOnSelect) {
                dp.hide();
            }
            return false;
        }


        if (kc < 37 || kc > 40) return true;

        var d = new Date(dp._currentDate).valueOf();
        if (kc == 37) // left
            d -= 24 * 60 * 60 * 1000;
        else if (kc == 39) // right
            d += 24 * 60 * 60 * 1000;
        else if (kc == 38) // up
                d -= 7 * 24 * 60 * 60 * 1000;
            else if (kc == 40) // down
                    d += 7 * 24 * 60 * 60 * 1000;

        dp.setCurrentDate(new Date(d));
        return false;
    }

    // ie6 extension
    this._calDiv.onmousewheel = function (e) {
        if (e == null) e = document.parentWindow.event;
        var n = - e.wheelDelta / 120;
        var d = new Date(dp._currentDate);
        var m = d.getMonth() + n;
        d.setMonth(m);


        dp.setCurrentDate(d);

        return false;
    }

    closebutton.onclick = function() {
        dp.hide();
    }

    this._monthSelect.onchange = function(e) {
        if (e == null) e = document.parentWindow.event;
        e = getEventObject(e);
        dp.setMonth(e.value);
    }

    this._monthSelect.onclick = function(e) {
        if (e == null) e = document.parentWindow.event;
        e = getEventObject(e);
        e.cancelBubble = true;
    }

    this._yearSelect.onchange = function(e) {
        if (e == null) e = document.parentWindow.event;
        e = getEventObject(e);
        dp.setYear(e.value);
    }


    document.body.appendChild(this._calDiv);


    return this._calDiv;
}

Calendar.prototype._update = function() {


    // Calculate the number of days in the month for the selected date
    var date = this._currentDate;
    var today = toISODate(new Date());


    var selected = "";
    if (this._selectedDate != null) {
        selected = toISODate(this._selectedDate);
    }
    var current = toISODate(this._currentDate);
    var d1 = new Date(date.getFullYear(), date.getMonth(), 1);
    var d2 = new Date(date.getFullYear(), date.getMonth() + 1, 1);
    var monthLength = Math.round((d2 - d1) / (24 * 60 * 60 * 1000));

    // Find out the weekDay index for the first of this month
    var firstIndex = (d1.getDay() - this._firstDayOfWeek) % 7 ;
    if (firstIndex < 0) {
        firstIndex += 7;
    }

    var index = 0;
    while (index < firstIndex) {
        this._dateSlot[index].value = -1;
        this._dateSlot[index].data.data = String.fromCharCode(160);
        this._dateSlot[index].data.parentNode.className = "";
        this._dateSlot[index].data.parentNode.style.fontWeight = "normal";
        this._dateSlot[index].data.parentNode.style.border = "none";
        index++;
    }

    for (i = 1; i <= monthLength; i++,index++) {
        this._dateSlot[index].value = i;
        this._dateSlot[index].data.data = i;
        this._dateSlot[index].data.parentNode.className = "";
        this._dateSlot[index].data.parentNode.style.fontWeight = "normal";
        this._dateSlot[index].data.parentNode.style.border = "none";
        if (toISODate(d1) == today) {
            this._dateSlot[index].data.parentNode.className = "today";
            this._dateSlot[index].data.parentNode.style.fontWeight = "bold";
        }
        if (toISODate(d1) == current) {
            this._dateSlot[index].data.parentNode.className += " current";
            this._dateSlot[index].data.parentNode.style.border = "1px dotted WindowText";
        }
        if (toISODate(d1) == selected) {
            this._dateSlot[index].data.parentNode.className += " selected";
            this._dateSlot[index].data.parentNode.style.border = "1px solid WindowText";
        }
        d1 = new Date(d1.getFullYear(), d1.getMonth(), d1.getDate() + 1);
    }

    var lastDateIndex = index;

    while (index < 42) {
        this._dateSlot[index].value = -1;
        this._dateSlot[index].data.data = String.fromCharCode(160);
        this._dateSlot[index].data.parentNode.className = "";
        this._dateSlot[index].data.parentNode.style.fontWeight = "normal";
        this._dateSlot[index].data.parentNode.style.border = "none";
        ++index;
    }

    // Week numbers
    if (this._includeWeek) {
        d1 = new Date(date.getFullYear(), date.getMonth(), 1);
        for (i = 0; i < 6; ++i) {
            if (i == 5 && lastDateIndex < 36) {
                this._weekSlot[i].data.data = String.fromCharCode(160);
                this._weekSlot[i].data.parentNode.style.borderRight = "none";
            } else {
                week = weekNumber(this, d1);
                this._weekSlot[i].data.data = week;
                this._weekSlot[i].data.parentNode.style.borderRight = "1px solid WindowText";
            }
            d1 = new Date(d1.getFullYear(), d1.getMonth(), d1.getDate() + 7);
        }
    }
}

Calendar.prototype.show = function(element) {
    if (!this._showing) {
        var p = getPoint(element);
        this._calDiv.style.display = "block";
        this._calDiv.style.top = (p.y + element.offsetHeight + 1) + "px";
        this._calDiv.style.left = p.x + "px";
        this._showing = true;

        /* -------- */
        if (this._bw.ie6)
        {
            dw = this._calDiv.offsetWidth;
            dh = this._calDiv.offsetHeight;
            var els = document.getElementsByTagName("body");
            var body = els[0];
            if (!body) return;

            //paste iframe under the modal
            var underDiv = this._calDiv.cloneNode(false);
            underDiv.style.zIndex = "390";
            underDiv.style.margin = "0px";
            underDiv.style.padding = "0px";
            underDiv.style.display = "block";
            underDiv.style.width = dw;
            underDiv.style.height = dh;
            underDiv.style.border = "1px solid WindowText";
            underDiv.innerHTML = "<iframe width=\"100%\" height=\"100%\" frameborder=\"0\"></iframe>";
            body.appendChild(underDiv);
            this._underDiv = underDiv;
        }
        /* -------- */

        if (this._calDiv.focus)
            this._calDiv.focus();
    }
};

Calendar.prototype.hide = function() {
    if (this._showing) {
        this._calDiv.style.display = "none";
        this._showing = false;
        if (this._bw.ie6) {
            if (this._underDiv) this._underDiv.removeNode(true);
        }
    }
}

Calendar.prototype.toggle = function(element) {
    if (this._showing) {
        this.hide();
    } else {
        this.show(element);
    }
}


Calendar.prototype.onchange = function() {
};


Calendar.prototype.setCurrentDate = function(date) {
    if (date == null) {
        return;
    }

    // if string or number create a Date object
    if (typeof date == "string" || typeof date == "number") {
        date = new Date(date);
    }


    // do not update if not really changed
    if (this._currentDate.getDate() != date.getDate() ||
        this._currentDate.getMonth() != date.getMonth() ||
        this._currentDate.getFullYear() != date.getFullYear()) {

        this._currentDate = new Date(date);

        this._updateHeader();
        this._update();
    }
}

Calendar.prototype.defaultInit = function(language) {
    if (language == "zh") {
        var monthnames = ["1","2","3","4","5","6","7","8","9","10","11","12"];
        var weeknames = ["周日","周一","周二","周三","周四","周五","周六"];
        var weeknamesshort = ["日","一","二","三","四","五","六"];
        this.initialize(monthnames, monthnames, weeknames, weeknamesshort, "yyyy-MM-dd", 1, false, 4, "清除", "关闭");
    }

    if (language = "en") {
        this.create();
    }

    if (language == "jp") {
        var monthnames = ["1","2","3","4","5","6","7","8","9","10","11","12"];
        var weeknames = ["土曜日","月曜日","日曜日","金曜日","木曜日","水曜日","火曜日"];
        var weeknamesshort = ["土","月","日","金","木","水","火"];
        this.initialize(monthnames, monthnames, weeknames, weeknamesshort, "yyyy-MM-dd", 1, false, 4, "削除", "閉じる");
    }
};

Calendar.prototype.setSelectedDate = function(date) {
    this._selectedDate = new Date(date);
    this.setCurrentDate(this._selectedDate);
    if (typeof this.onchange == "function") {
        this.onchange();
    }
}

Calendar.prototype.clearSelectedDate = function() {
    this._selectedDate = null;
    if (typeof this.onchange == "function") {
        this.onchange();
    }
}

Calendar.prototype.getElement = function() {
    return this._calDiv;
}

Calendar.prototype.setIncludeWeek = function(v) {
    if (this._calDiv == null) {
        this._includeWeek = v;
    }
}

Calendar.prototype.setClearButtonLabel = function(v) {
    this._clearButtonLabel = v;
}

Calendar.prototype.setCloseButtonLabel = function(v) {
    this._closeButtonLabel = v;
}

Calendar.prototype.getSelectedDate = function () {
    if (this._selectedDate == null) {
        return null;
    } else {
        return new Date(this._selectedDate);
    }
}

Calendar.prototype.initialize = function(monthNames, shortMonthNames, weekDayNames, shortWeekDayNames, format,
                                         firstDayOfWeek, includeWeek, minimalDaysInFirstWeek, clearButtonLabel, closeButtonLabel)
{
    this.setMonthNames(monthNames);
    this.setShortMonthNames(shortMonthNames);
    this.setWeekDayNames(weekDayNames);
    this.setShortWeekDayNames(shortWeekDayNames);
    this.setFormat(format);
    this.setFirstDayOfWeek(firstDayOfWeek);
    this.setIncludeWeek(includeWeek);
    this.setMinimalDaysInFirstWeek(minimalDaysInFirstWeek);
    this.setClearButtonLabel(clearButtonLabel);
    this.setCloseButtonLabel(closeButtonLabel);

    this.create();
}


Calendar.prototype._updateHeader = function () {

    //
    var options = this._monthSelect.options;
    var m = this._currentDate.getMonth();
    for (var i = 0; i < options.length; ++i) {
        options[i].selected = false;
        if (options[i].value == m) {
            options[i].selected = true;
        }
    }

    options = this._yearSelect.options;
    var year = this._currentDate.getFullYear();
    for (var i = 0; i < options.length; ++i) {
        options[i].selected = false;
        if (options[i].value == year) {
            options[i].selected = true;
        }
    }

}

Calendar.prototype.setYear = function(year) {
    var d = new Date(this._currentDate);
    d.setFullYear(year);
    this.setCurrentDate(d);
}

Calendar.prototype.setMonth = function (month) {
    var d = new Date(this._currentDate);
    d.setMonth(month);
    this.setCurrentDate(d);
}

Calendar.prototype.nextMonth = function () {
    this.setMonth(this._currentDate.getMonth() + 1);
}

Calendar.prototype.prevMonth = function () {
    this.setMonth(this._currentDate.getMonth() - 1);
}

Calendar.prototype.setFirstDayOfWeek = function (nFirstWeekDay) {
    this._firstDayOfWeek = nFirstWeekDay;
}

Calendar.prototype.getFirstDayOfWeek = function () {
    return this._firstDayOfWeek;
}

Calendar.prototype.setMinimalDaysInFirstWeek = function(n) {
    this._minimalDaysInFirstWeek = n;
}


Calendar.prototype.getMinimalDaysInFirstWeek = function () {
    return this._minimalDaysInFirstWeek;
}

Calendar.prototype.setMonthNames = function(a) {
    // sanity test
    this._monthNames = a;
}

Calendar.prototype.setShortMonthNames = function(a) {
    // sanity test
    this._shortMonthNames = a;
}

Calendar.prototype.setWeekDayNames = function(a) {
    // sanity test
    this._weekDayNames = a;
}

Calendar.prototype.setDisplayYear = function(start, end) {
    this.startyear = start;
    this.lastyear = end;
}

Calendar.prototype.setShortWeekDayNames = function(a) {
    // sanity test
    this._shortWeekDayNames = a;
}

Calendar.prototype.getFormat = function() {
    return this._format;
}

Calendar.prototype.setFormat = function(f) {
    this._format = f;
}

Calendar.prototype.formatDate = function() {
    if (this._selectedDate == null) {
        return "";
    }

    var bits = new Array();
    // work out what each bit should be
    var date = this._selectedDate;
    bits['d'] = date.getDate();
    bits['dd'] = pad(date.getDate(), 2);
    bits['ddd'] = this._shortWeekDayNames[date.getDay()];
    bits['dddd'] = this._weekDayNames[date.getDay()];

    bits['M'] = date.getMonth() + 1;
    bits['MM'] = pad(date.getMonth() + 1, 2);
    bits['MMM'] = this._shortMonthNames[date.getMonth()];
    bits['MMMM'] = this._monthNames[date.getMonth()];

    var yearStr = "" + date.getFullYear();
    yearStr = (yearStr.length == 2) ? '19' + yearStr : yearStr;
    bits['yyyy'] = yearStr;
    bits['yy'] = bits['yyyy'].toString().substr(2, 2);

    bits['s'] = date.getSeconds();
    bits['ss'] = pad(date.getSeconds(), 2);

    bits['m'] = date.getMinutes();
    bits['mm'] = pad(date.getMinutes(), 2);

    bits['H'] = date.getHours();
    bits['HH'] = pad(date.getHours(), 2);

    // do some funky regexs to replace the format string
    // with the real values
    var frm = new String(this._format);
    // TAPESTRY-669: Have to be very explicit about keys, to keep functions added
    // to Array (by the Prototype library, if its around) from getting mixed in.
    var keys = new Array('d', 'dd', 'ddd', 'dddd', 'M', 'MM', 'MMM', 'MMMM', 'yyyy', 'yy', 's', 'ss', 'm',
            'mm', 'H', 'HH');
    for (var i = 0; i < keys.length; i++) {
        frm = eval("frm.replace(/\\b" + keys[i] + "\\b/,\"" + bits[keys[i]] + "\");");
    }

    return frm;
}


function isLeapYear(year) {
    return ((year % 4 == 0) && ((year % 100 != 0) || (year % 400 == 0)));
}

function yearLength(year) {
    if (isLeapYear(year))
        return 366;
    else
        return 365;
}

function dayOfYear(date) {
    var a = Calendar.NUM_DAYS;
    if (isLeapYear(date.getFullYear())) {
        a = Calendar.LEAP_NUM_DAYS;
    }
    var month = date.getMonth();

    return a[month] + date.getDate();
}

// ---------------------------------------------
// Week number stuff
// ---------------------------------------------

function weekNumber(cal, date) {

    var dow = date.getDay();
    var doy = dayOfYear(date);
    var year = date.getFullYear();

    // Compute the week of the year.  Valid week numbers run from 1 to 52
    // or 53, depending on the year, the first day of the week, and the
    // minimal days in the first week.  Days at the start of the year may
    // fall into the last week of the previous year; days at the end of
    // the year may fall into the first week of the next year.
    var relDow = (dow + 7 - cal.getFirstDayOfWeek()) % 7; // 0..6
    var relDowJan1 = (dow - doy + 701 - cal.getFirstDayOfWeek()) % 7; // 0..6
    var week = Math.floor((doy - 1 + relDowJan1) / 7); // 0..53
    if ((7 - relDowJan1) >= cal.getMinimalDaysInFirstWeek()) {
        ++week;
    }

    if (doy > 359) { // Fast check which eliminates most cases
        // Check to see if we are in the last week; if so, we need
        // to handle the case in which we are the first week of the
        // next year.
        var lastDoy = yearLength(year);
        var lastRelDow = (relDow + lastDoy - doy) % 7;
        if (lastRelDow < 0) {
            lastRelDow += 7;
        }
        if (((6 - lastRelDow) >= cal.getMinimalDaysInFirstWeek())
                && ((doy + 7 - relDow) > lastDoy)) {
            week = 1;
        }
    } else if (week == 0) {
        // We are the last week of the previous year.
        var prevDoy = doy + yearLength(year - 1);
        week = weekOfPeriod(cal, prevDoy, dow);
    }

    return week;
}

function weekOfPeriod(cal, dayOfPeriod, dayOfWeek) {
    // Determine the day of the week of the first day of the period
    // in question (either a year or a month).  Zero represents the
    // first day of the week on this calendar.
    var periodStartDayOfWeek =
            (dayOfWeek - cal.getFirstDayOfWeek() - dayOfPeriod + 1) % 7;
    if (periodStartDayOfWeek < 0) {
        periodStartDayOfWeek += 7;
    }

    // Compute the week number.  Initially, ignore the first week, which
    // may be fractional (or may not be).  We add periodStartDayOfWeek in
    // order to fill out the first week, if it is fractional.
    var weekNo = Math.floor((dayOfPeriod + periodStartDayOfWeek - 1) / 7);

    // If the first week is long enough, then count it.  If
    // the minimal days in the first week is one, or if the period start
    // is zero, we always increment weekNo.
    if ((7 - periodStartDayOfWeek) >= cal.getMinimalDaysInFirstWeek()) {
        ++weekNo;
    }

    return weekNo;
}


function getEventObject(e) {  // utility function to retrieve object from event
    if (navigator.appName == "Microsoft Internet Explorer") {
        return e.srcElement;
    } else {  // is mozilla/netscape
        // need to crawl up the tree to get the first "real" element
        // i.e. a tag, not raw text
        var o = e.target;
        while (!o.tagName) {
            o = o.parentNode;
        }
        return o;
    }
}

function addEvent(name, obj, funct) { // utility function to add event handlers

    if (navigator.appName == "Microsoft Internet Explorer") {
        obj.attachEvent("on" + name, funct);
    } else {  // is mozilla/netscape
        obj.addEventListener(name, funct, false);
    }
}


function deleteEvent(name, obj, funct) { // utility function to delete event handlers

    if (navigator.appName == "Microsoft Internet Explorer") {
        obj.detachEvent("on" + name, funct);
    } else {  // is mozilla/netscape
        obj.removeEventListener(name, funct, false);
    }
}

function setCursor(obj) {
    if (navigator.appName == "Microsoft Internet Explorer") {
        obj.style.cursor = "hand";
    } else {  // is mozilla/netscape
        obj.style.cursor = "pointer";
    }
}

function Point(iX, iY)
{
    this.x = iX;
    this.y = iY;
}


function getPoint(aTag)
{
    var oTmp = aTag;
    var point = new Point(0, 0);

    do
    {
        point.x += oTmp.offsetLeft;
        point.y += oTmp.offsetTop;
        oTmp = oTmp.offsetParent;
    }
    while (oTmp.tagName != "BODY" && oTmp.tagName != "HTML");

    return point;
}

function toISODate(date) {
    var s = date.getFullYear();
    var m = date.getMonth() + 1;
    if (m < 10) {
        m = "0" + m;
    }
    var day = date.getDate();
    if (day < 10) {
        day = "0" + day;
    }
    return String(s) + String(m) + String(day);

}

function pad(number, X) {   // utility function to pad a number to a given width
    X = (!X ? 2 : X);
    number = "" + number;
    while (number.length < X) {
        number = "0" + number;
    }
    return number;
}

function bw_check()
{
    var is_major = parseInt(navigator.appVersion);
    this.nver = is_major;
    this.ver = navigator.appVersion;
    this.agent = navigator.userAgent;
    this.dom = document.getElementById ? 1 : 0;
    this.opera = window.opera ? 1 : 0;
    this.ie5 = ( this.ver.indexOf("MSIE 5") > -1 && this.dom && !this.opera ) ? 1 : 0;
    this.ie6 = ( this.ver.indexOf("MSIE 6") > -1 && this.dom && !this.opera ) ? 1 : 0;
    this.ie4 = ( document.all && !this.dom && !this.opera ) ? 1 : 0;
    this.ie = this.ie4 || this.ie5 || this.ie6;
    this.mac = this.agent.indexOf("Mac") > -1;
    this.ns6 = ( this.dom && parseInt(this.ver) >= 5 ) ? 1 : 0;
    this.ie3 = ( this.ver.indexOf("MSIE") && ( is_major < 4 ) );
    this.hotjava = ( this.agent.toLowerCase().indexOf('hotjava') != -1 ) ? 1 : 0;
    this.ns4 = ( document.layers && !this.dom && !this.hotjava ) ? 1 : 0;
    this.bw = ( this.ie6 || this.ie5 || this.ie4 || this.ns4 || this.ns6 || this.opera );
    this.ver3 = ( this.hotjava || this.ie3 );
    this.opera7 = ( ( this.agent.toLowerCase().indexOf('opera 7') > -1 ) || ( this.agent.toLowerCase().indexOf('opera/7') > -1 ) );
    this.operaOld = this.opera && !this.opera7;
    return this;
}
;