/***********************************************
 Fool-Proof Date Input Script with DHTML Calendar
 by Jason Moon - calendar@moonscript.com
 ************************************************/

// Customizable variables
//var DefaultDateFormat = 'YYYY-MM-DD'; // If no date format is supplied, this will be used instead
var DefaultDateFormat = 'DD/MM/YYYY';
var HideWait = 1; // 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 StyleURL = '/js/calendar/style.css';
var ImageURL = '/js/calendar/calendar.jpg';
var NextURL = '/js/calendar/next.gif';
var PrevURL = '/js/calendar/prev.gif';

var CellHeight = 16;

// Global variables
var ZCounter = 100;
var Today = new Date();
var WeekDays = new Array('Su','Mo','Tu','We','Th','Fr','Sa');
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');


// 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 + CalDiv.offsetHeight;
      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)) {
               if ((document.forms[j].elements[i].type == 'text') && (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, ClassName, HoveredDay) {
    if (Over) {
        Cell.className += ' calDateDayFocus';

        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 {
        Cell.className = ClassName;
        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="100%" border="0" cellspacing="0" cellpadding="2">';

            HTML += '<tr class="calDateWeekDay">';
            for (var w=0;w<7;w++) HTML += '<td>' + WeekDays[w] + '</td>';
            HTML += '</tr>';

    for (var j=0;j<Rows;j++) {
        HTML += '<tr class="calDateDay">';
        for (var i=1;i<=7;i++) {
            TextClass = '';
            if (i==1 || i==7)
            TextClass += ' calDateWeekEnd';

            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)) {
                    TextClass += ' calDateDaySelect';
                }

                if ((this.displayed.yearValue == Today.getFullYear()) && (this.displayed.monthIndex == Today.getMonth()) && (Day == Today.getDate())) {
                    TextClass += ' calDateDayCurrent';
                }

                HTML += '<td class="'+TextClass+'" onClick="' + this.objName + '.pickDay(' + Day + ');" onMouseOver="return ' + this.objName + '.displayed.dayHover(this,true,\'' + TextClass + '\',' + Day + ');" onMouseOut="return ' + this.objName + '.displayed.dayHover(this,false,\'' + TextClass + '\');">' + Day + '</td>' + String.fromCharCode(13);
            }
            else {
                HTML += '<td class="'+TextClass+'">&nbsp;</td>' + String.fromCharCode(13);
            }
        }
        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.fixSelects(!StopTimer);
      this.getCalendar().style.zIndex = --ZCounter;
      this.getCalendar().style.visibility = 'hidden';
   }
   else {
      var StopTimer = false;
      this.fixSelects(!StopTimer);
      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 */
   var fld_DateName = DateName;
   var obj_DateName = DateName.replace(/(\W)+/g, '_');
       obj_DateName = obj_DateName.replace(/^[^A-Za-z]/, '');
       obj_DateName = obj_DateName.replace(/[^A-Za-z]$/, '');

   this.hiddenFieldName = fld_DateName;
   this.monthListID     = fld_DateName + '_Month_ID';
   this.dayListID       = fld_DateName + '_Day_ID';
   this.yearFieldID     = fld_DateName + '_Year_ID';
   this.monthDisplayID  = fld_DateName + '_Current_ID';
   this.dayTableID      = fld_DateName + '_DayTable_ID';
   this.calendarLinkID  = fld_DateName + '_Link_ID';

   this.calendarID = fld_DateName + '_ID';
//   this.calendarLinkID = this.calendarID + '_Link';
//   this.timerID = this.calendarID + '_Timer';
   this.timerID = obj_DateName + '_ID_Timer';
   this.objName = obj_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 class="ErrorStyle">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 || DefaultDate=='') { // The date wasn't passed in
           DefaultDate = (Required) ? CurrentDate.formatted : ''; // If required, use today's date
        }

        // Creates the calendar object!
        var fld_DateName = DateName;
        var obj_DateName = DateName.replace(/(\W)+/g, '_');
            obj_DateName = obj_DateName.replace(/^[^A-Za-z]/, '');
            obj_DateName = obj_DateName.replace(/[^A-Za-z]$/, '');

        eval(obj_DateName + '_Object=new calendarObject("' + DateName + '","' + DateFormat + '","' + DefaultDate + '");');

        // Determine initial viewable state of day, year, and calendar icon
//        if ((Required) || (arguments.length == 4)) {
        if (DefaultDate!='') {
            var InitialStatus = '';
            var InitialDate = eval(obj_DateName + '_Object.picked.formatted;');
        }
        else {
            var InitialStatus = 'style="visibility:hidden"';
            var InitialDate = '';
            eval(obj_DateName + '_Object.setPicked(' + Today.getFullYear() + ',' + Today.getMonth() + ',' + Today.getDate() + ');');
        }

        // Create the form elements
        with (document) {
            writeln('<link rel="stylesheet" href="' + StyleURL + '" type="text/css" />' + String.fromCharCode(13));
//            writeln('<input type="hidden" name="' + fld_DateName + '" value="' + InitialDate + '">');

            writeln('<table border="0" cellpadding="0" cellspacing="0"><tr>' + String.fromCharCode(13));
            writeln('<td nowrap><input type="text" name="' + fld_DateName + '" value="' + InitialDate + '" readonly style="width:37px;">&nbsp;</td>' + String.fromCharCode(13));

            writeln('<td nowrap style="display:none;"><select id="' + fld_DateName + '_Month_ID" onChange="' + obj_DateName + '_Object.changeMonth(this);">');
            if (!Required) {
                var NoneSelected = (DefaultDate == '') ? 'selected' : '';
                writeln('<option value="" ' + NoneSelected + '>' + UnselectedMonthText + '</option>');
            }
            for (var i=0;i<12;i++) {
                MonthSelected = ((DefaultDate != '') && (eval(obj_DateName + '_Object.picked.monthIndex') == i)) ? 'selected' : '';
                writeln('<option value="' + i + '" ' + MonthSelected + '>' + MonthNames[i].substr(0,3) + '</option>');
            }
            writeln('</select>&nbsp;</td>' + String.fromCharCode(13));

            writeln('<td nowrap style="display:none;"><select ' + InitialStatus + ' id="' + fld_DateName + '_Day_ID" onChange="' + obj_DateName + '_Object.changeDay(this);">');
            for (var j=1;j<=eval(obj_DateName + '_Object.picked.dayCount');j++) {
               DaySelected = ((DefaultDate != '') && (eval(obj_DateName + '_Object.picked.day') == j)) ? 'selected' : '';
               writeln('<option ' + DaySelected + '>' + j + '</option>');
            }
            writeln('</select>&nbsp;</td>' + String.fromCharCode(13));

            writeln('<td nowrap style="display:none;"><input ' + InitialStatus + ' type="text" id="' + fld_DateName + '_Year_ID" size="' + eval(obj_DateName + '_Object.picked.yearPad.length') + '" maxlength="' + eval(obj_DateName + '_Object.picked.yearPad.length') + '" title="Year" value="' + eval(obj_DateName + '_Object.picked.yearPad') + '" onKeyPress="return YearDigitsOnly(window.event);" onKeyUp="' + obj_DateName + '_Object.checkYear(this);" onBlur="' + obj_DateName + '_Object.fixYear(this);">&nbsp;</td>' + String.fromCharCode(13));

            writeln('<td nowrap><a ' + InitialStatus + ' id="' + fld_DateName + '_Link_ID" href="javascript:' + obj_DateName + '_Object.show();" onMouseOver="return ' + obj_DateName + '_Object.iconHover(true);" onMouseOut="return ' + obj_DateName + '_Object.iconHover(false);"><img src="' + ImageURL + '" title="Calendar" border="0" vspace="3"></a>&nbsp;');

            writeln('<span id="' + fld_DateName + '_ID" class="calDateBlock" onMouseOver="' + obj_DateName + '_Object.handleTimer(true);" onMouseOut="' + obj_DateName + '_Object.handleTimer(false);">');
            writeln('<table class="calDateMonth" width="100%" border="0" cellspacing="0" cellpadding="1"><tr>' + String.fromCharCode(13));
            writeln('<td id="' + fld_DateName + '_Previous_ID" title="' + eval(obj_DateName + '_Object.previous.monthName') + '" class="calDateMonthImg" onClick="' + obj_DateName + '_Object.previous.go();"         onMouseOver="return ' + obj_DateName + '_Object.previous.hover(this,true);"               onMouseOut="return ' + obj_DateName + '_Object.previous.hover(this,false);" onMouseDown="VirtualButton(this,true);" onMouseUp="VirtualButton(this,false);"><img src="' + PrevURL + '" border="0" hspace="3"></td>' + String.fromCharCode(13));
            writeln('<td id="' + fld_DateName + '_Current_ID"  title="Show Current Month" nowrap                                 class="calDateMonth"    onClick="' + obj_DateName + '_Object.displayed.goCurrent();" onMouseOver="self.status=\'Click to view ' + CurrentDate.fullName + '\';return true;"     onMouseOut="self.status=\'\';return true;">' + eval(obj_DateName + '_Object.displayed.fullName') + '</td>' + String.fromCharCode(13));
            writeln('<td id="' + fld_DateName + '_Next_ID"     title="' + eval(obj_DateName + '_Object.next.monthName') + '"     class="calDateMonthImg" onClick="' + obj_DateName + '_Object.next.go();"             onMouseOver="return ' + obj_DateName + '_Object.next.hover(this,true);"                   onMouseOut="return ' + obj_DateName + '_Object.next.hover(this,false);"     onMouseDown="VirtualButton(this,true);" onMouseUp="VirtualButton(this,false);"><img src="' + NextURL + '" border="0" hspace="3"></td>' + String.fromCharCode(13));
            writeln('</tr></table>' + String.fromCharCode(13));
/*
            writeln('<table class="calDateWeekDay" width="100%" border="0" cellspacing="0" cellpadding="2"><tr>' + String.fromCharCode(13));
            for (var w=0;w<7;w++) writeln('<td class="calDateWeekDay">' + WeekDays[w] + '</td>');
            writeln('</tr></table>' + String.fromCharCode(13));
*/
            writeln('<span id="' + fld_DateName + '_DayTable_ID">' + eval(obj_DateName + '_Object.buildCalendar();') + '</span>' + String.fromCharCode(13));

            writeln('</span></td></tr></table>' + String.fromCharCode(13));

        }

            // Find this form number
            eval('var formNumber = ' + obj_DateName + '_Object.formNumber;');

            var forms = document.forms;
            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 == fld_DateName)) {
                        if ((forms[f].elements[e].type == 'text') && (forms[f].elements[e].name == fld_DateName)) {
//                            eval(obj_DateName + '_Object.formNumber='+f);
                            formNumber = f;
                            break;
                        }
                    }
                }
            }

            eval(obj_DateName + '_Object.formNumber='+(formNumber>=0 ? formNumber : 0));
    }
}