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<script>
// Customizable variables
var DefaultDateFormat = 'MM/DD/YYYY'; // If no date format is supplied, this will be used instead
var HideWait = 3; // Number of seconds before the calendar will disappear
var Y2kPivotPoint = 76; // 2-digit years before this point will be created in the 21st century
var UnselectedMonthText = ''; // Text to display in the 1st month list item when the date isn't required
var FontSize = 11; // In pixels
var FontFamily = 'Tahoma';
var CellWidth = 18;
var CellHeight = 16;
var ImageURL = 'calendar.jpg';
var NextURL = 'next.gif';
var PrevURL = 'prev.gif';
var CalBGColor = 'white';
var TopRowBGColor = 'buttonface';
var DayBGColor = 'lightgrey';

// Global variables
var ZCounter = 100;
var Today = new Date();
var WeekDays = new Array('S','M','T','W','T','F','S');
var MonthDays = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var MonthNames = new Array('January',
'February',
'March','April','May','June','July','August','September','October','November','December');

// Write out the stylesheet definition for the calendar
with (document) {
 writeln('<style>');
 writeln('td.calendarDateInput {letter-spacing:normal;line-height:normal;font-family:' + FontFamily + ',Sans-Serif;font-size:' + FontSize + 'px;}');
 writeln('select.calendarDateInput {letter-spacing:.06em;font-family:Verdana,Sans-Serif;font-size:11px;}');
 writeln('input.calendarDateInput {letter-spacing:.06em;font-family:Verdana,Sans-Serif;font-size:11px;}');
 writeln('</style>');
}

// Only allows certain keys to be used in the date field
function YearDigitsOnly(e) {
 var KeyCode = (e.keyCode) ? e.keyCode : e.which;
 return ((KeyCode == 8) // backspace
 || (KeyCode == 9) // tab
 || (KeyCode == 37) // left arrow
 || (KeyCode == 39) // right arrow
 || (KeyCode == 46) // delete
 || ((KeyCode > 47) && (KeyCode < 58)) // 0 - 9
 );
}

// Gets the absolute pixel position of the supplied element
function GetTagPixels(StartTag, Direction) {
 var PixelAmt = (Direction == 'LEFT') ? StartTag.offsetLeft : StartTag.offsetTop;
 while ((StartTag.tagName != 'BODY') && (StartTag.tagName != 'HTML')) {
 StartTag = StartTag.offsetParent;
 PixelAmt += (Direction == 'LEFT') ? StartTag.offsetLeft : StartTag.offsetTop;
 }
 return PixelAmt;
}

// Is the specified select-list behind the calendar?
function BehindCal(SelectList, CalLeftX, CalRightX, CalTopY, CalBottomY, ListTopY) {
 var ListLeftX = GetTagPixels(SelectList, 'LEFT');
 var ListRightX = ListLeftX + SelectList.offsetWidth;
 var ListBottomY = ListTopY + SelectList.offsetHeight;
 return (((ListTopY < CalBottomY) && (ListBottomY > CalTopY)) && ((ListLeftX < CalRightX) && (ListRightX > CalLeftX)));
}

// For IE, hides any select-lists that are behind the calendar
function FixSelectLists(Over) {
 if (navigator.appName == 'Microsoft Internet Explorer') {
 var CalDiv = this.getCalendar();
 var CalLeftX = CalDiv.offsetLeft;
 var CalRightX = CalLeftX + CalDiv.offsetWidth;
 var CalTopY = CalDiv.offsetTop;
 var CalBottomY = CalTopY + (CellHeight * 9);
 var FoundCalInput = false;
 formLoop :
 for (var j=this.formNumber;j<document.forms.length;j++) {
 for (var i=0;i<document.forms[j].elements.length;i++) {
 if (typeof document.forms[j].elements[i].type == 'string') {
 if ((document.forms[j].elements[i].type == 'hidden') && (document.forms[j].elements[i].name == this.hiddenFieldName)) {
 FoundCalInput = true;
 i += 3; // 3 elements between the 1st hidden field and the last year input field
 }
 if (FoundCalInput) {
 if (document.forms[j].elements[i].type.substr(0,6) == 'select') {
 ListTopY = GetTagPixels(document.forms[j].elements[i], 'TOP');
 if (ListTopY < CalBottomY) {
 if (BehindCal(document.forms[j].elements[i], CalLeftX, CalRightX, CalTopY, CalBottomY, ListTopY)) {
 document.forms[j].elements[i].style.visibility = (Over) ? 'hidden' : 'visible';
 }
 }
 else break formLoop;
 }
 }
 }
 }
 }
 }
}

// Displays a message in the status bar when hovering over the calendar days
function DayCellHover(Cell, Over, Color, HoveredDay) {
 Cell.style.backgroundColor = (Over) ? DayBGColor : Color;
 if (Over) {
 if ((this.yearValue == Today.getFullYear()) && (this.monthIndex == Today.getMonth()) && (HoveredDay == Today.getDate())) self.status = 'Click to select today';
 else {
 var Suffix = HoveredDay.toString();
 switch (Suffix.substr(Suffix.length - 1, 1)) {
 case '1' : Suffix += (HoveredDay == 11) ? 'th' : 'st'; break;
 case '2' : Suffix += (HoveredDay == 12) ? 'th' : 'nd'; break;
 case '3' : Suffix += (HoveredDay == 13) ? 'th' : 'rd'; break;
 default : Suffix += 'th'; break;
 }
 self.status = 'Click to select ' + this.monthName + ' ' + Suffix;
 }
 }
 else self.status = '';
 return true;
}

// Sets the form elements after a day has been picked from the calendar
function PickDisplayDay(ClickedDay) {
 this.show();
 var MonthList = this.getMonthList();
 var DayList = this.getDayList();
 var YearField = this.getYearField();
 FixDayList(DayList, GetDayCount(this.displayed.yearValue, this.displayed.monthIndex));
 // Select the month and day in the lists
 for (var i=0;i<MonthList.length;i++) {
 if (MonthList.options[i].value == this.displayed.monthIndex) MonthList.options[i].selected = true;
 }
 for (var j=1;j<=DayList.length;j++) {
 if (j == ClickedDay) DayList.options[j-1].selected = true;
 }
 this.setPicked(this.displayed.yearValue, this.displayed.monthIndex, ClickedDay);
 // Change the year, if necessary
 YearField.value = this.picked.yearPad;
 YearField.defaultValue = YearField.value;
}

// Builds the HTML for the calendar days
function BuildCalendarDays() {
 var Rows = 5;
 if (((this.displayed.dayCount == 31) && (this.displayed.firstDay > 4)) || ((this.displayed.dayCount == 30) && (this.displayed.firstDay == 6))) Rows = 6;
 else if ((this.displayed.dayCount == 28) && (this.displayed.firstDay == 0)) Rows = 4;
 var HTML = '<table width="' + (CellWidth * 7) + '" cellspacing="0" cellpadding="1" style="cursor:default">';
 for (var j=0;j<Rows;j++) {
 HTML += '<tr>';
 for (var i=1;i<=7;i++) {
 Day = (j * 7) + (i - this.displayed.firstDay);
 if ((Day >= 1) && (Day <= this.displayed.dayCount)) {
 if ((this.displayed.yearValue == this.picked.yearValue) && (this.displayed.monthIndex == this.picked.monthIndex) && (Day == this.picked.day)) {
 TextStyle = 'color:white;font-weight:bold;'
 BackColor = DayBGColor;
 }
 else {
 TextStyle = 'color:black;'
 BackColor = CalBGColor;
 }
 if ((this.displayed.yearValue == Today.getFullYear()) && (this.displayed.monthIndex == Today.getMonth()) && (Day == Today.getDate())) TextStyle += 'border:1px solid darkred;padding:0px;';
 HTML += '<td align="center" class="calendarDateInput" style="cursor:default;height:' + CellHeight + ';width:' + CellWidth + ';' + TextStyle + ';background-color:' + BackColor + '" onClick="' + this.objName + '.pickDay(' + Day + ')" onMouseOver="return ' + this.objName + '.displayed.dayHover(this,true,\'' + BackColor + '\',' + Day + ')" onMouseOut="return ' + this.objName + '.displayed.dayHover(this,false,\'' + BackColor + '\')">' + Day + '</td>';
 }
 else HTML += '<td class="calendarDateInput" style="height:' + CellHeight + '">&nbsp;</td>';
 }
 HTML += '</tr>';
 }
 return HTML += '</table>';
}

// Determines which century to use (20th or 21st) when dealing with 2-digit years
function GetGoodYear(YearDigits) {
 if (YearDigits.length == 4) return YearDigits;
 else {
 var Millennium = (YearDigits < Y2kPivotPoint) ? 2000 : 1900;
 return Millennium + parseInt(YearDigits,10);
 }
}

// Returns the number of days in a month (handles leap-years)
function GetDayCount(SomeYear, SomeMonth) {
 return ((SomeMonth == 1) && ((SomeYear % 400 == 0) || ((SomeYear % 4 == 0) && (SomeYear % 100 != 0)))) ? 29 : MonthDays[SomeMonth];
}

// Highlights the buttons
function VirtualButton(Cell, ButtonDown) {
 if (ButtonDown) {
 Cell.style.borderLeft = 'buttonshadow 1px solid';
 Cell.style.borderTop = 'buttonshadow 1px solid';
 Cell.style.borderBottom = 'buttonhighlight 1px solid';
 Cell.style.borderRight = 'buttonhighlight 1px solid';
 }
 else {
 Cell.style.borderLeft = 'buttonhighlight 1px solid';
 Cell.style.borderTop = 'buttonhighlight 1px solid';
 Cell.style.borderBottom = 'buttonshadow 1px solid';
 Cell.style.borderRight = 'buttonshadow 1px solid';
 }
}

// Mouse-over for the previous/next month buttons
function NeighborHover(Cell, Over, DateObj) {
 if (Over) {
 VirtualButton(Cell, false);
 self.status = 'Click to view ' + DateObj.fullName;
 }
 else {
 Cell.style.border = 'buttonface 1px solid';
 self.status = '';
 }
 return true;
}

// Adds/removes days from the day list, depending on the month/year
function FixDayList(DayList, NewDays) {
 var DayPick = DayList.selectedIndex + 1;
 if (NewDays != DayList.length) {
 var OldSize = DayList.length;
 for (var k=Math.min(NewDays,OldSize);k<Math.max(NewDays,OldSize);k++) {
 (k >= NewDays) ? DayList.options[NewDays] = null : DayList.options[k] = new Option(k+1, k+1);
 }
 DayPick = Math.min(DayPick, NewDays);
 DayList.options[DayPick-1].selected = true;
 }
 return DayPick;
}

// Resets the year to its previous valid value when something invalid is entered
function FixYearInput(YearField) {
 var YearRE = new RegExp('\\d{' + YearField.defaultValue.length + '}');
 if (!YearRE.test(YearField.value)) YearField.value = YearField.defaultValue;
}

// Displays a message in the status bar when hovering over the calendar icon
function CalIconHover(Over) {
 var Message = (this.isShowing()) ? 'hide' : 'show';
 self.status = (Over) ? 'Click to ' + Message + ' the calendar' : '';
 return true;
}

// Starts the timer over from scratch
function CalTimerReset() {
 eval('clearTimeout(' + this.timerID + ')');
 eval(this.timerID + '=setTimeout(\'' + this.objName + '.show()\',' + (HideWait * 1000) + ')');
}

// The timer for the calendar
function DoTimer(CancelTimer) {
 if (CancelTimer) eval('clearTimeout(' + this.timerID + ')');
 else {
 eval(this.timerID + '=null');
 this.resetTimer();
 }
}

// Show or hide the calendar
function ShowCalendar() {
 if (this.isShowing()) {
 var StopTimer = true;
 this.getCalendar().style.zIndex = --ZCounter;
 this.getCalendar().style.visibility = 'hidden';
 this.fixSelects(false);
 }
 else {
 var StopTimer = false;
 this.fixSelects(true);
 this.getCalendar().style.zIndex = ++ZCounter;
 this.getCalendar().style.visibility = 'visible';
 }
 this.handleTimer(StopTimer);
 self.status = '';
}

// Hides the input elements when the "blank" month is selected
function SetElementStatus(Hide) {
 this.getDayList().style.visibility = (Hide) ? 'hidden' : 'visible';
 this.getYearField().style.visibility = (Hide) ? 'hidden' : 'visible';
 this.getCalendarLink().style.visibility = (Hide) ? 'hidden' : 'visible';
}

// Sets the date, based on the month selected
function CheckMonthChange(MonthList) {
 var DayList = this.getDayList();
 if (MonthList.options[MonthList.selectedIndex].value == '') {
 DayList.selectedIndex = 0;
 this.hideElements(true);
 this.setHidden('');
 }
 else {
 this.hideElements(false);
 if (this.isShowing()) {
 this.resetTimer(); // Gives the user more time to view the calendar with the newly-selected month
 this.getCalendar().style.zIndex = ++ZCounter; // Make sure this calendar is on top of any other calendars
 }
 var DayPick = FixDayList(DayList, GetDayCount(this.picked.yearValue, MonthList.options[MonthList.selectedIndex].value));
 this.setPicked(this.picked.yearValue, MonthList.options[MonthList.selectedIndex].value, DayPick);
 }
}

// Sets the date, based on the day selected
function CheckDayChange(DayList) {
 if (this.isShowing()) this.show();
 this.setPicked(this.picked.yearValue, this.picked.monthIndex, DayList.selectedIndex+1);
}

// Changes the date when a valid year has been entered
function CheckYearInput(YearField) {
 if ((YearField.value.length == YearField.defaultValue.length) && (YearField.defaultValue != YearField.value)) {
 if (this.isShowing()) {
 this.resetTimer(); // Gives the user more time to view the calendar with the newly-entered year
 this.getCalendar().style.zIndex = ++ZCounter; // Make sure this calendar is on top of any other calendars
 }
 var NewYear = GetGoodYear(YearField.value);
 var MonthList = this.getMonthList();
 var NewDay = FixDayList(this.getDayList(), GetDayCount(NewYear, this.picked.monthIndex));
 this.setPicked(NewYear, this.picked.monthIndex, NewDay);
 YearField.defaultValue = YearField.value;
 }
}

// Holds characteristics about a date
function dateObject() {
 if (Function.call) { // Used when 'call' method of the Function object is supported
 var ParentObject = this;
 var ArgumentStart = 0;
 }
 else { // Used with 'call' method of the Function object is NOT supported
 var ParentObject = arguments[0];
 var ArgumentStart = 1;
 }
 ParentObject.date = (arguments.length == (ArgumentStart+1)) ? new Date(arguments[ArgumentStart+0]) : new Date(arguments[ArgumentStart+0], arguments[ArgumentStart+1], arguments[ArgumentStart+2]);
 ParentObject.yearValue = ParentObject.date.getFullYear();
 ParentObject.monthIndex = ParentObject.date.getMonth();
 ParentObject.monthName = MonthNames[ParentObject.monthIndex];
 ParentObject.fullName = ParentObject.monthName + ' ' + ParentObject.yearValue;
 ParentObject.day = ParentObject.date.getDate();
 ParentObject.dayCount = GetDayCount(ParentObject.yearValue, ParentObject.monthIndex);
 var FirstDate = new Date(ParentObject.yearValue, ParentObject.monthIndex, 1);
 ParentObject.firstDay = FirstDate.getDay();
}

// Keeps track of the date that goes into the hidden field
function storedMonthObject(DateFormat, DateYear, DateMonth, DateDay) {
 (Function.call) ? dateObject.call(this, DateYear, DateMonth, DateDay) : dateObject(this, DateYear, DateMonth, DateDay);
 this.yearPad = this.yearValue.toString();
 this.monthPad = (this.monthIndex < 9) ? '0' + String(this.monthIndex + 1) : this.monthIndex + 1;
 this.dayPad = (this.day < 10) ? '0' + this.day.toString() : this.day;
 this.monthShort = this.monthName.substr(0,3).toUpperCase();
 // Formats the year with 2 digits instead of 4
 if (DateFormat.indexOf('YYYY') == -1) this.yearPad = this.yearPad.substr(2);
 // Define the date-part delimiter
 if (DateFormat.indexOf('/') >= 0) var Delimiter = '/';
 else if (DateFormat.indexOf('-') >= 0) var Delimiter = '-';
 else var Delimiter = '';
 // Determine the order of the months and days
 if (/DD?.?((MON)|(MM?M?))/.test(DateFormat)) {
 this.formatted = this.dayPad + Delimiter;
 this.formatted += (RegExp.$1.length == 3) ? this.monthShort : this.monthPad;
 }
 else if (/((MON)|(MM?M?))?.?DD?/.test(DateFormat)) {
 this.formatted = (RegExp.$1.length == 3) ? this.monthShort : this.monthPad;
 this.formatted += Delimiter + this.dayPad;
 }
 // Either prepend or append the year to the formatted date
 this.formatted = (DateFormat.substr(0,2) == 'YY') ? this.yearPad + Delimiter + this.formatted : this.formatted + Delimiter + this.yearPad;
}

// Object for the current displayed month
function displayMonthObject(ParentObject, DateYear, DateMonth, DateDay) {
 (Function.call) ? dateObject.call(this, DateYear, DateMonth, DateDay) : dateObject(this, DateYear, DateMonth, DateDay);
 this.displayID = ParentObject.hiddenFieldName + '_Current_ID';
 this.getDisplay = new Function('return document.getElementById(this.displayID)');
 this.dayHover = DayCellHover;
 this.goCurrent = new Function(ParentObject.objName + '.getCalendar().style.zIndex=++ZCounter;' + ParentObject.objName + '.setDisplayed(Today.getFullYear(),Today.getMonth());');
 if (ParentObject.formNumber >= 0) this.getDisplay().innerHTML = this.fullName;
}

// Object for the previous/next buttons
function neighborMonthObject(ParentObject, IDText, DateMS) {
 (Function.call) ? dateObject.call(this, DateMS) : dateObject(this, DateMS);
 this.buttonID = ParentObject.hiddenFieldName + '_' + IDText + '_ID';
 this.hover = new Function('C','O','NeighborHover(C,O,this)');
 this.getButton = new Function('return document.getElementById(this.buttonID)');
 this.go = new Function(ParentObject.objName + '.getCalendar().style.zIndex=++ZCounter;' + ParentObject.objName + '.setDisplayed(this.yearValue,this.monthIndex);');
 if (ParentObject.formNumber >= 0) this.getButton().title = this.monthName;
}

// Sets the currently-displayed month object
function SetDisplayedMonth(DispYear, DispMonth) {
 this.displayed = new displayMonthObject(this, DispYear, DispMonth, 1);
 // Creates the previous and next month objects
 this.previous = new neighborMonthObject(this, 'Previous', this.displayed.date.getTime() - 86400000);
 this.next = new neighborMonthObject(this, 'Next', this.displayed.date.getTime() + (86400000 * (this.displayed.dayCount + 1)));
 // Creates the HTML for the calendar
 if (this.formNumber >= 0) this.getDayTable().innerHTML = this.buildCalendar();
}

// Sets the current selected date
function SetPickedMonth(PickedYear, PickedMonth, PickedDay) {
 this.picked = new storedMonthObject(this.format, PickedYear, PickedMonth, PickedDay);
 this.setHidden(this.picked.formatted);
 this.setDisplayed(PickedYear, PickedMonth);
}

// The calendar object
function calendarObject(DateName, DateFormat, DefaultDate) {

 /* Properties */
 this.hiddenFieldName = DateName;
 this.monthListID = DateName + '_Month_ID';
 this.dayListID = DateName + '_Day_ID';
 this.yearFieldID = DateName + '_Year_ID';
 this.monthDisplayID = DateName + '_Current_ID';
 this.calendarID = DateName + '_ID';
 this.dayTableID = DateName + '_DayTable_ID';
 this.calendarLinkID = this.calendarID + '_Link';
 this.timerID = this.calendarID + '_Timer';
 this.objName = DateName + '_Object';
 this.format = DateFormat;
 this.formNumber = -1;
 this.picked = null;
 this.displayed = null;
 this.previous = null;
 this.next = null;

 /* Methods */
 this.setPicked = SetPickedMonth;
 this.setDisplayed = SetDisplayedMonth;
 this.checkYear = CheckYearInput;
 this.fixYear = FixYearInput;
 this.changeMonth = CheckMonthChange;
 this.changeDay = CheckDayChange;
 this.resetTimer = CalTimerReset;
 this.hideElements = SetElementStatus;
 this.show = ShowCalendar;
 this.handleTimer = DoTimer;
 this.iconHover = CalIconHover;
 this.buildCalendar = BuildCalendarDays;
 this.pickDay = PickDisplayDay;
 this.fixSelects = FixSelectLists;
 this.setHidden = new Function('D','if (this.formNumber >= 0) this.getHiddenField().value=D');
 // Returns a reference to these elements
 this.getHiddenField = new Function('return document.forms[this.formNumber].elements[this.hiddenFieldName]');
 this.getMonthList = new Function('return document.getElementById(this.monthListID)');
 this.getDayList = new Function('return document.getElementById(this.dayListID)');
 this.getYearField = new Function('return document.getElementById(this.yearFieldID)');
 this.getCalendar = new Function('return document.getElementById(this.calendarID)');
 this.getDayTable = new Function('return document.getElementById(this.dayTableID)');
 this.getCalendarLink = new Function('return document.getElementById(this.calendarLinkID)');
 this.getMonthDisplay = new Function('return document.getElementById(this.monthDisplayID)');
 this.isShowing = new Function('return !(this.getCalendar().style.visibility != \'visible\')');

 /* Constructor */
 // Functions used only by the constructor
 function getMonthIndex(MonthAbbr) { // Returns the index (0-11) of the supplied month abbreviation
 for (var MonPos=0;MonPos<MonthNames.length;MonPos++) {
 if (MonthNames[MonPos].substr(0,3).toUpperCase() == MonthAbbr.toUpperCase()) break;
 }
 return MonPos;
 }
 function SetGoodDate(CalObj, Notify) { // Notifies the user about their bad default date, and sets the current system date
 CalObj.setPicked(Today.getFullYear(), Today.getMonth(), Today.getDate());
 if (Notify) alert('WARNING: The supplied date is not in valid \'' + DateFormat + '\' format: ' + DefaultDate + '.\nTherefore, the current system date will be used instead: ' + CalObj.picked.formatted);
 }
 // Main part of the constructor
 if (DefaultDate != '') {
 if ((this.format == 'YYYYMMDD') && (/^(\d{4})(\d{2})(\d{2})$/.test(DefaultDate))) this.setPicked(RegExp.$1, parseInt(RegExp.$2,10)-1, RegExp.$3);
 else {
 // Get the year
 if ((this.format.substr(0,2) == 'YY') && (/^(\d{2,4})(-|\/)/.test(DefaultDate))) { // Year is at the beginning
 var YearPart = GetGoodYear(RegExp.$1);
 // Determine the order of the months and days
 if (/(-|\/)(\w{1,3})(-|\/)(\w{1,3})$/.test(DefaultDate)) {
 var MidPart = RegExp.$2;
 var EndPart = RegExp.$4;
 if (/D$/.test(this.format)) { // Ends with days
 var DayPart = EndPart;
 var MonthPart = MidPart;
 }
 else {
 var DayPart = MidPart;
 var MonthPart = EndPart;
 }
 MonthPart = (/\d{1,2}/i.test(MonthPart)) ? parseInt(MonthPart,10)-1 : getMonthIndex(MonthPart);
 this.setPicked(YearPart, MonthPart, DayPart);
 }
 else SetGoodDate(this, true);
 }
 else if (/(-|\/)(\d{2,4})$/.test(DefaultDate)) { // Year is at the end
 var YearPart = GetGoodYear(RegExp.$2);
 // Determine the order of the months and days
 if (/^(\w{1,3})(-|\/)(\w{1,3})(-|\/)/.test(DefaultDate)) {
 if (this.format.substr(0,1) == 'D') { // Starts with days
 var DayPart = RegExp.$1;
 var MonthPart = RegExp.$3;
 }
 else { // Starts with months
 var MonthPart = RegExp.$1;
 var DayPart = RegExp.$3;
 }
 MonthPart = (/\d{1,2}/i.test(MonthPart)) ? parseInt(MonthPart,10)-1 : getMonthIndex(MonthPart);
 this.setPicked(YearPart, MonthPart, DayPart);
 }
 else SetGoodDate(this, true);
 }
 else SetGoodDate(this, true);
 }
 }
}

// Main function that creates the form elements
function DateInput(DateName, Required, DateFormat, DefaultDate) {
 if (arguments.length == 0) document.writeln('<span style="color:red;font-size:' + FontSize + 'px;font-family:' + FontFamily + ';">ERROR: Missing required parameter in call to \'DateInput\': [name of hidden date field].</span>');
 else {
 // Handle DateFormat
 if (arguments.length < 3) { // The format wasn't passed in, so use default
 DateFormat = DefaultDateFormat;
 if (arguments.length < 2) Required = false;
 }
 else if (/^(Y{2,4}(-|\/)?)?((MON)|(MM?M?)|(DD?))(-|\/)?((MON)|(MM?M?)|(DD?))((-|\/)Y{2,4})?$/i.test(DateFormat)) DateFormat = DateFormat.toUpperCase();
 else { // Passed-in DateFormat was invalid, use default format instead
 var AlertMessage = 'WARNING: The supplied date format for the \'' + DateName + '\' field is not valid: ' + DateFormat + '\nTherefore, the default date format will be used instead: ' + DefaultDateFormat;
 DateFormat = DefaultDateFormat;
 if (arguments.length == 4) { // DefaultDate was passed in with an invalid date format
 var CurrentDate = new storedMonthObject(DateFormat, Today.getFullYear(), Today.getMonth(), Today.getDate());
 AlertMessage += '\n\nThe supplied date (' + DefaultDate + ') cannot be interpreted with the invalid format.\nTherefore, the current system date will be used instead: ' + CurrentDate.formatted;
 DefaultDate = CurrentDate.formatted;
 }
 alert(AlertMessage);
 }
 // Define the current date if it wasn't set already
 if (!CurrentDate) var CurrentDate = new storedMonthObject(DateFormat, Today.getFullYear(), Today.getMonth(), Today.getDate());
 // Handle DefaultDate
 if (arguments.length < 4) { // The date wasn't passed in
 DefaultDate = (Required) ? CurrentDate.formatted : ''; // If required, use today's date
 }
 // Creates the calendar object!
 eval(DateName + '_Object=new calendarObject(\'' + DateName + '\',\'' + DateFormat + '\',\'' + DefaultDate + '\')');
 // Determine initial viewable state of day, year, and calendar icon
 if ((Required) || (arguments.length == 4)) {
 var InitialStatus = '';
 var InitialDate = eval(DateName + '_Object.picked.formatted');
 }
 else {
 var InitialStatus = ' style="visibility:hidden"';
 var InitialDate = '';
 eval(DateName + '_Object.setPicked(' + Today.getFullYear() + ',' + Today.getMonth() + ',' + Today.getDate() + ')');
 }
 // Create the form elements
 with (document) {
 writeln('<input type="hidden" name="' + DateName + '" value="' + InitialDate + '">');
 // Find this form number
 for (var f=0;f<forms.length;f++) {
 for (var e=0;e<forms[f].elements.length;e++) {
 if (typeof forms[f].elements[e].type == 'string') {
 if ((forms[f].elements[e].type == 'hidden') && (forms[f].elements[e].name == DateName)) {
 eval(DateName + '_Object.formNumber='+f);
 break;
 }
 }
 }
 }
 writeln('<table cellpadding="0" cellspacing="2"><tr>' + String.fromCharCode(13) + '<td valign="middle">');
 writeln('<select class="calendarDateInput" id="' + DateName + '_Month_ID" onChange="' + DateName + '_Object.changeMonth(this)" name=ringmonth>');
 if (!Required) {
 var NoneSelected = (DefaultDate == '') ? ' selected' : '';
 writeln('<option value=""' + NoneSelected + '>' + UnselectedMonthText + '</option>');
 }
 for (var i=0;i<12;i++) {
 MonthSelected = ((DefaultDate != '') && (eval(DateName + '_Object.picked.monthIndex') == i)) ? ' selected' : '';
 writeln('<option value="' + i + '"' + MonthSelected + '>' + MonthNames[i]+ '</option>');
 }
 writeln('</select>' + String.fromCharCode(13) + '</td>' + String.fromCharCode(13) + '<td valign="middle">');
 writeln('<select' + InitialStatus + ' class="calendarDateInput" id="' + DateName + '_Day_ID" onChange="' + DateName + '_Object.changeDay(this)" name=ringday>');
 for (var j=1;j<=eval(DateName + '_Object.picked.dayCount');j++) {
 DaySelected = ((DefaultDate != '') && (eval(DateName + '_Object.picked.day') == j)) ? ' selected' : '';
 writeln('<option' + DaySelected + '>' + j + '</option>');
 }
 writeln('</select>' + String.fromCharCode(13) + '</td>' + String.fromCharCode(13) + '<td valign="middle">');
 writeln('<input name=ringyear ' + InitialStatus + ' class="calendarDateInput" type="text" id="' + DateName + '_Year_ID" size="' + eval(DateName + '_Object.picked.yearPad.length') + '" maxlength="' + eval(DateName + '_Object.picked.yearPad.length') + '" title="Year" value="' + eval(DateName + '_Object.picked.yearPad') + '" onKeyPress="return YearDigitsOnly(window.event)" onKeyUp="' + DateName + '_Object.checkYear(this)" onBlur="' + DateName + '_Object.fixYear(this)">');
 write('<td valign="middle">' + String.fromCharCode(13) + '<a' + InitialStatus + ' id="' + DateName + '_ID_Link" href="javascript:' + DateName + '_Object.show()" onMouseOver="return ' + DateName + '_Object.iconHover(true)" onMouseOut="return ' + DateName + '_Object.iconHover(false)">选择日期</a>&nbsp;');
 writeln('<span id="' + DateName + '_ID" style="position:absolute;visibility:hidden;width:' + (CellWidth * 7) + 'px;background-color:' + CalBGColor + ';border:1px solid dimgray;" onMouseOver="' + DateName + '_Object.handleTimer(true)" onMouseOut="' + DateName + '_Object.handleTimer(false)">');
 writeln('<table width="' + (CellWidth * 7) + '" cellspacing="0" cellpadding="1">' + String.fromCharCode(13) + '<tr style="background-color:' + TopRowBGColor + ';">');
 writeln('<td id="' + DateName + '_Previous_ID" style="cursor:default" align="center" class="calendarDateInput" style="height:' + CellHeight + '" onClick="' + DateName + '_Object.previous.go()" onMouseDown="VirtualButton(this,true)" onMouseUp="VirtualButton(this,false)" onMouseOver="return ' + DateName + '_Object.previous.hover(this,true)" onMouseOut="return ' + DateName + '_Object.previous.hover(this,false)" title="' + eval(DateName + '_Object.previous.monthName') + '"> << </td>');
 writeln('<td id="' + DateName + '_Current_ID" style="cursor:pointer" align="center" class="calendarDateInput" style="height:' + CellHeight + '" colspan="5" onClick="' + DateName + '_Object.displayed.goCurrent()" onMouseOver="self.status=\'Click to view ' + CurrentDate.fullName + '\';return true;" onMouseOut="self.status=\'\';return true;" title="Show Current Month">' + eval(DateName + '_Object.displayed.fullName') + '</td>');
 writeln('<td id="' + DateName + '_Next_ID" style="cursor:default" align="center" class="calendarDateInput" style="height:' + CellHeight + '" onClick="' + DateName + '_Object.next.go()" onMouseDown="VirtualButton(this,true)" onMouseUp="VirtualButton(this,false)" onMouseOver="return ' + DateName + '_Object.next.hover(this,true)" onMouseOut="return ' + DateName + '_Object.next.hover(this,false)" title="' + eval(DateName + '_Object.next.monthName') + '"> >></td></tr>' + String.fromCharCode(13) + '<tr>');
 for (var w=0;w<7;w++) writeln('<td width="' + CellWidth + '" align="center" class="calendarDateInput" style="height:' + CellHeight + ';width:' + CellWidth + ';font-weight:bold;border-top:1px solid dimgray;border-bottom:1px solid dimgray;">' + WeekDays[w] + '</td>');
 writeln('</tr>' + String.fromCharCode(13) + '</table>' + String.fromCharCode(13) + '<span id="' + DateName + '_DayTable_ID">' + eval(DateName + '_Object.buildCalendar()') + '</span>' + String.fromCharCode(13) + '</span>' + String.fromCharCode(13) + '</td>' + String.fromCharCode(13) + '</tr>' + String.fromCharCode(13) + '</table>');
 }
 }
}

<script>DateInput('orderdate', true, 'DD-MON-YYYY')</script>