/**This is a JavaScript library that will allow you to easily add some basic DHTMLdrop-down datepicker functionality to your Notes forms. This script is not asfull-featured as others you may find on the Internet, but it's free, it's easy tounderstand, and it's easy to change.You'll also want to include a stylesheet that makes the datepicker elementslook nice. An example one can be found in the database that this script wasoriginally released with, at:http://www.nsftools.com/tips/NotesTips.htm#datepickerI've tested this lightly with Internet Explorer 6 and Mozilla Firefox. I have no ideahow compatible it is with other browsers.version 1.5December 4, 2005Julian Robichaux -- http://www.nsftools.comHISTORY--  version 1.0 (Sept. 4, 2004):Initial release.--  version 1.1 (Sept. 5, 2004):Added capability to define the date format to be used, either globally (using thedefaultDateSeparator and defaultDateFormat variables) or when the displayDatePickerfunction is called.--  version 1.2 (Sept. 7, 2004):Fixed problem where datepicker x-y coordinates weren't right inside of a table.Fixed problem where datepicker wouldn't display over selection lists on a page.Added a call to the datePickerClosed function (if one exists) after the datepickeris closed, to allow the developer to add their own custom validation after a datehas been chosen. For this to work, you must have a function called datePickerClosedsomewhere on the page, that accepts a field object as a parameter. See theexample in the comments of the updateDateField function for more details.--  version 1.3 (Sept. 9, 2004)Fixed problem where adding the <div> and <iFrame> used for displaying the datepickerwas causing problems on IE 6 with global variables that had handles to objects onthe page (I fixed the problem by adding the elements using document.createElement()and document.body.appendChild() instead of document.body.innerHTML += ...).--  version 1.4 (Dec. 20, 2004)Added "targetDateField.focus();" to the updateDateField function (as suggestedby Alan Lepofsky) to avoid a situation where the cursor focus is at the top of theform after a date has been picked. Added "padding: 0px;" to the dpButton CSSstyle, to keep the table from being so wide when displayed in Firefox.-- version 1.5 (Dec 4, 2005)Added display=none when datepicker is hidden, to fix problem where cursor isnot visible on input fields that are beneath the date picker. Added additional nulldate handling for date errors in Safari when the date is empty. Added additionalerror handling for iFrame creation, to avoid reported errors in Opera. AddedonMouseOver event for day cells, to allow color changes when the mouse hoversover a cell (to make it easier to determine what cell you're over). Added commentsin the style sheet, to make it more clear what the different style elements are for.*/var datePickerDivID = "datepicker";var iFrameDivID = "datepickeriframe";var dayArrayShort = new Array('日', '一', '二', '三', '四', '五', '六');var dayArrayMed = new Array('日', '一', '二', '三', '四', '五', '六');var dayArrayLong = new Array('周日', '周一', '周二', '周三', '周四', '周五', '周六');var monthArrayShort = new Array('一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月');var monthArrayMed = new Array('一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月');var monthArrayLong = new Array('一月', '二月', '三月', '四月', '五月', '六月', '七月', '八月', '九月', '十月', '十一月', '十二月'); // these variables define the date formatting we're expecting and outputting.// If you want to use a different format by default, change the defaultDateSeparator// and defaultDateFormat variables either here or on your HTML page.var defaultDateSeparator = "/";        // common values would be "/" or "."var defaultDateFormat = "mdy"    // valid values are "mdy", "dmy", and "ymd"var dateSeparator = defaultDateSeparator;var dateFormat = defaultDateFormat;/**This is the main function you'll call from the onClick event of a button.Normally, you'll have something like this on your HTML page:Start Date: <input name="StartDate"><input type=button value="select" onclick="displayDatePicker('StartDate');">That will cause the datepicker to be displayed beneath the StartDate field andany date that is chosen will update the value of that field. If you'd rather have thedatepicker display beneath the button that was clicked, you can code the buttonlike this:<input type=button value="select" onclick="displayDatePicker('StartDate', this);">So, pretty much, the first argument (dateFieldName) is a string representing thename of the field that will be modified if the user picks a date, and the secondargument (displayBelowThisObject) is optional and represents an actual nodeon the HTML document that the datepicker should be displayed below.In version 1.1 of this code, the dtFormat and dtSep variables were added, allowingyou to use a specific date format or date separator for a given call to this function.Normally, you'll just want to set these defaults globally with the defaultDateSeparatorand defaultDateFormat variables, but it doesn't hurt anything to add them as optionalparameters here. An example of use is:<input type=button value="select" onclick="displayDatePicker('StartDate', false, 'dmy', '.');">This would display the datepicker beneath the StartDate field (because thedisplayBelowThisObject parameter was false), and update the StartDate field withthe chosen value of the datepicker using a date format of dd.mm.yyyy*/function displayDatePicker(dateFieldName, displayBelowThisObject, dtFormat, dtSep){  var targetDateField = document.getElementsByName (dateFieldName).item(0);   // if we weren't told what node to display the datepicker beneath, just display it  // beneath the date field we're updating  if (!displayBelowThisObject)    displayBelowThisObject = targetDateField;   // if a date separator character was given, update the dateSeparator variable  if (dtSep)    dateSeparator = dtSep;  else    dateSeparator = defaultDateSeparator;   // if a date format was given, update the dateFormat variable  if (dtFormat)    dateFormat = dtFormat;  else    dateFormat = defaultDateFormat;   var x = displayBelowThisObject.offsetLeft;  var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;   // deal with elements inside tables and such  var parent = displayBelowThisObject;  while (parent.offsetParent) {    parent = parent.offsetParent;    x += parent.offsetLeft;    y += parent.offsetTop ;  }   drawDatePicker(targetDateField, x, y);}/**Draw the datepicker object (which is just a table with calendar elements) at thespecified x and y coordinates, using the targetDateField object as the input tagthat will ultimately be populated with a date.This function will normally be called by the displayDatePicker function.*/function drawDatePicker(targetDateField, x, y){  var dt = getFieldDate(targetDateField.value );   // the datepicker table will be drawn inside of a <div> with an ID defined by the  // global datePickerDivID variable. If such a div doesn't yet exist on the HTML  // document we're working with, add one.  if (!document.getElementById(datePickerDivID)) {    // don't use innerHTML to update the body, because it can cause global variables    // that are currently pointing to objects on the page to have bad references    //document.body.innerHTML += "<div id='" + datePickerDivID + "' class='dpDiv'></div>";    var newNode = document.createElement("div");    newNode.setAttribute("id", datePickerDivID);    newNode.setAttribute("class", "dpDiv");    newNode.setAttribute("style", "visibility: hidden;");    document.body.appendChild(newNode);  }   // move the datepicker div to the proper x,y coordinate and toggle the visiblity  var pickerDiv = document.getElementById(datePickerDivID);  pickerDiv.style.position = "absolute";  pickerDiv.style.left = x + "px";  pickerDiv.style.top = y + "px";  pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");  pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");  pickerDiv.style.zIndex = 10000;   // draw the datepicker table  refreshDatePicker(targetDateField.name, dt.getFullYear(), dt.getMonth(), dt.getDate());}/**This is the function that actually draws the datepicker calendar.*/function refreshDatePicker(dateFieldName, year, month, day){  // if no arguments are passed, use today's date; otherwise, month and year  // are required (if a day is passed, it will be highlighted later)  var thisDay = new Date();   if ((month >= 0) && (year > 0)) {    thisDay = new Date(year, month, 1);  } else {    day = thisDay.getDate();    thisDay.setDate(1);  }   // the calendar will be drawn as a table  // you can customize the table elements with a global CSS style sheet,  // or by hardcoding style and formatting elements below  var crlf = "\r\n";  var TABLE = "<table cols=7 class='dpTable'>" + crlf;  var xTABLE = "</table>" + crlf;  var TR = "<tr class='dpTR'>";  var TR_title = "<tr class='dpTitleTR'>";  var TR_days = "<tr class='dpDayTR'>";  var TR_todaybutton = "<tr class='dpTodayButtonTR'>";  var xTR = "</tr>" + crlf;  var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event  var TD_title = "<td colspan=5 class='dpTitleTD'>";  var TD_buttons = "<td class='dpButtonTD'>";  var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";  var TD_days = "<td class='dpDayTD'>";  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event  var xTD = "</td>" + crlf;  var DIV_title = "<div class='dpTitleText'>";  var DIV_selected = "<div class='dpDayHighlight'>";  var xDIV = "</div>";   // start generating the code for the calendar table  var html = TABLE;   // this is the title bar, which displays the month and the buttons to  // go back to a previous month or forward to the next month  html += TR_title;  html += TD_buttons + getButtonCode(dateFieldName, thisDay, -1, "&lt;") + xTD;  html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;  html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&gt;") + xTD;  html += xTR;   // this is the row that indicates which day of the week we're on  html += TR_days;  for(i = 0; i < dayArrayShort.length; i++)    html += TD_days + dayArrayShort[i] + xTD;  html += xTR;   // now we'll start populating the table with days of the month  html += TR;   // first, the leading blanks  for (i = 0; i < thisDay.getDay(); i++)    html += TD + "&nbsp;" + xTD;   // now, the days of the month  do {    dayNum = thisDay.getDate();    TD_onclick = " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";