[TODO]
 - be able to specify different styling of next / prev arrows for nav

dev : 09/04/08
 - If you set disablePastDate to true and you're in the next month, it does
   not allow you to go back to the month of today. (Kevin Tucker)
 - modification in the visible() call, we now check if the datepicker exists
   in the page, if it does we call the visible() check (Timothy VanFosson)
 - added the showEvent options to new so that you can specify the event on
   which the DOM should trigger the datepicker, by default it's click (Timothy VanFosson)
 - added contentAppend option to new so that you can specify the id to which
   the generated datepicker will be appended, by default content is appended
   to the body tag (Paulo F Nhaia)
 - added option enableYearBrowse to new so that you can see two new arrows in
   the header to jump direclty to next or previous year (Nuno)
 - changed the border : from div.datepicker to div.datepicker table in the css
   file, fixes a bug under IE* when changing the font-size and calendar
   dimension (Filippo Buratti)
 - increase the delay for closeTimer and clear it whe ncalling click (Peter
   Coppinger)
 - fixed a security warning in IE < 7 when calling iframe in secure
   environnement (Marek Wawrzyczny, Matthew Vickers)
 - fixed typos in spanish language (Ignacio Fernandez)
 - added Polish translation (Daniel Czubak)
 - fixed a bug when trying to set the disableFutureDate to false when passed
   through the constructor (Kaspar)
 - added Russian translation (Andrew Shishkov)
 - added Greek translation (Kostantinos Koukopoulos)

v0.9.4 : 12/12/07
 - [INCOMPATIBILITY CHANGE] : there is a new way to set the date formatting,
   it's no longer based on the language choosen, you need to set it in the
   datepicker creation, like : new DatePicker({ dateFormat : [  "yyyy", "mm",
   "dd" ], "/" ]}); or you can call it directly via the setDateFormat method
   with the same arguments : obj.setDateFormat([ "yyyy", "mm", "dd" ], "/"); (thanks to Arturas Slajus for his work on DatePickerFormatter class)
 - [INCOMPATIBILITY CHANGE] : the datepicker is now drawn in a table with
   theader / tbody / tfooter tags, you need to use the new css to keep the
   proper styling of the datepicker.
 - handle the IE-bug on <select /> layer, this will allow the datepicker to be
  properly drawn over the select tag. (Joćo Paulo Madureira Gondim)
 - call load() when the click event is triggered and if the datepicker
   doesn't already exists (Gareth Evans)
 - when the date is provided as a value in input field it must respect the
   dateFormat specified, accordingly the date wasn't set properly as there was
   a bug in the DatePickerFormatter.current_date() method (Masaru Tomimitsu)
 - added Japanese language (Masaru Tomimitsu)
 - added Finnish language (Jarkko Sipilä)
 - added Romanian language (Viorel Irimia)
 - use toPaddedString for date formatting
 - added enableCloseOnBlur if set to true the datepicker will be closed when
   the blur event is triggered on the relative input field (Gareth Evans)
 - [WARNING] : the following options have been added to the object
   instanciation:
   - disablePastDate : set to false by default, this will disable the
     selection of past date
   - disableFutureDate : set to true by default, this will disable the
     selection of future dates
  - the css styles : nclick_outbound and nclick have been added to the css to
    style the unselectable cells triggering the disablePastDate and
    disableFutureDate options. (Viorel Irimia)
 - when disableFutureDate and/or disablePastDate are used, the next/previous
   arrows on the month navigation are not enabled according to current date
   and the settings of options.
 - added Latvian language (Gatis Tomsons)
 - added Swedish language (Johan Fredholm)
 - added Simplified Chinese language (Jackson Chen)

v0.9.3  : 12/11/07
 - added Hungarian language (Gango Vince)
 - added Lithuanian language (Arturas Slajus)
 - added Norwegian language (Vilhelm K. Vardųy)
 - added Danish language (Tobias Hinnerup)
 - added Dutch language (Emil Zegers, Martjin Heesters & Leo van Snippenburg)
 - added options to specify the show / close effects : showEffect,
   showEffectDuration, closeEffect, closeEffectDuration (Damon Toal-Rossi)
 - if the relativePosition option is true, the datepicker will be relatively
   positionned to the parent node, otherwise it will be appended to body (Damon Toal-Rossi)
 - added afterClose option which executes the provided function when the
   close method of the DatePicker is executed. (Antoine Gancel)
 - added option externalControl which can be used to display the datepicker
   by clicking somewhere else than on the input box (Andrew Kaspick)
 - added option cellCallback which allow you to specify a callback function
   when a date is clicked on the datepicker, the cell object which is clicked
   is provided as the first argument of the callback (Andrew Kaspick)
 - added setPositionLeft and setPositionTop options to constructor to be able
   to position the datepicker when we have relativePostion=false (mandatory)
   and we are not able / don't want to call the setPosition method (Franz Junge)
 - added the visible() function which returns the current visibility status of
   the datepicker (Emil Zegers)
 - added enableShowEffect and enableCloseEffect : by default set to true, will
   use the effects provided by Scriptaculous, if you don't want to depend on
   Scriptaculous, set both to false and you will only have hide and show
   effects. (suggestion by Richard Quadling)
 - fixed a bug when 'close' text had UTF-8 characters
 - [INCOMPATIBILITY CHANGE]: you need to upgrade to SAU 1.8.0 & Prototype 1.6.0 
 -- use dom:loaded event for loading datepicker control
 -- use Object.* methods for checking values

v0.9.2 : 11/04/07
 - added options leftOffset et topOffset for relative positionning against
 the relative element (Jonathan Poissant)
 - added setPosition method for absolute positionning (Jonathan Poissant)
 - added relativePosition to activate/desactivate relative positionning
 - some code clean-up

v0.9.1 : 13/03/07
 - replace locale by language (RobG)
 - add support for german language (Kjell Bublitz)
 - add support for portuguese language
 - use Prototype.emptyFunction when clickCallBack not defined, should fix
 possible bug with IE and null objects (Gareth Evans)
 - some code clean-up using Builder.node

v0.9 : 11/03/07
 initial release