/**
This is a JavaScript library that will allow you to easily add some basic DHTML
drop-down datepicker functionality to your Notes forms. This script is not as
full-featured as others you may find on the Internet, but it's free, it's easy to
understand, and it's easy to change.

You'll also want to include a stylesheet that makes the datepicker elements
look nice. An example one can be found in the database that this script was
originally released with, at:

http://www.nsftools.com/tips/NotesTips.htm#datepicker

I've tested this lightly with Internet Explorer 6 and Mozilla Firefox. I have no idea
how compatible it is with other browsers.

version 1.5
December 4, 2005
Julian Robichaux -- http://www.nsftools.com

HISTORY
--  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 the
defaultDateSeparator and defaultDateFormat variables) or when the displayDatePicker
function 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 datepicker
is closed, to allow the developer to add their own custom validation after a date
has been chosen. For this to work, you must have a function called datePickerClosed
somewhere on the page, that accepts a field object as a parameter. See the
example 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 datepicker
was causing problems on IE 6 with global variables that had handles to objects on
the 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 suggested
by Alan Lepofsky) to avoid a situation where the cursor focus is at the top of the
form after a date has been picked. Added "padding: 0px;" to the dpButton CSS
style, 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 is
not visible on input fields that are beneath the date picker. Added additional null
date handling for date errors in Safari when the date is empty. Added additional
error handling for iFrame creation, to avoid reported errors in Opera. Added
onMouseOver event for day cells, to allow color changes when the mouse hovers
over a cell (to make it easier to determine what cell you're over). Added comments
in the style sheet, to make it more clear what the different style elements are for.
*/

var datePickerDivID = "datepicker";
var iFrameDivID = "datepickeriframe";