// *****************************************************************************
//      Simple Calendar Widget - Cross-Browser Javascript pop-up calendar.
//
//   Copyright (C) 2005-2007  Anthony Garrett
//
//   This library is free software; you can redistribute it and/or
//   modify it under the terms of the GNU Lesser General Public
//   License as published by the Free Software Foundation; either
//   version 2.1 of the License, or (at your option) any later version.
//
//   This library is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
//   Lesser General Public License for more details.
//
//   You should have received a copy of the GNU Lesser General Public
//   License along with this library; if not, it is available at
//   the GNU web site (http://www.gnu.org/) or by writing to the
//   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
//   Boston, MA  02110-1301  USA
//
// *****************************************************************************
//
// Contact:   Sorry, I can't offer support for this but if you find a problem
//            (or just want to tell me how useful you find it), please send
//            me an email at scwfeedback@tarrget.info (Note the two Rs in
//            tarrget).  I will try to fix problems quickly but this is a
//            spare time thing for me.
//
// Credits:   I wrote this from scratch myself but I couldn't have done it
//            without the superb "JavaScript The Definitive Guide" by David
//            Flanagan (Pub. O'Reilly ISBN 0-596-00048-0).  I also recognise
//            a contribution from my experience with PopCalendar 4.1 by
//            Liming(Victor) Weng.
//
// Link back: Please give me credit and link back to my page.  To ensure that
//            search engines give my page a higher ranking you can add the
//            following HTML to any indexed page on your web site:
//
//            <A HREF="http://www.tarrget.info/calendar/scw.htm">
//              Simple Calendar Widget by Anthony Garrett
//            </A>
//
// Features:  Easily customised
//                  (output date format, colours, language, year range and
//                   week start day)
//            Accepts a date as input
//                  (see comments below for formats).
//            Cross-browser code tested against;
//                  Internet Explorer 6.0.28     Mozilla  1.7.1
//                  Opera             7.52+      Firefox  0.9.1+
//                  Konqueror         3.4.0      Flock    0.4.9
//
// How to add the Calendar to your page:
//            This script needs to be defined for your page so, immediately
//            after the BODY tag add the following line;
//
//                  <script type='Text/JavaScript' src='scw.js'></script>
//
//            Your root directory of the web site should also contain an empty
//            file called "scwblank.html". See
//                  http://www.tarrget.info/calendar/IEnightmare.html
//            for a full explanation.
//
// How to use the Calendar once it is defined for your page:
//
//            Simply choose an event to trigger the calendar (like an onClick
//            or an onMouseOver) and an element to work on (for the calendar
//            to take its initial date from and write its output date to) then
//            write it like this;
//
//                  <<event>>="scwShow(<<element>>,event);"
//
//            e.g. onClick="scwShow(scwID('myElement'),event);"
//            or   onMouseOver="scwShow(this,event);"
//
//            NOTE: If you wish to use the calendar with an Anchor tag, do
//                  not use the syntax:   href="javascript:scwShow(...)"
//                  Instead you should use the following;
//
//                  <a href="#" onclick="scwShow(<<element>>,event);return false;">
//                      <<your text>>
//                  </a>
//
//            If you are using a text node then specify the text's parent node
//            in the function call. The date should be the only text under that
//            node;
//
//            e.g.  <p onclick="scwShow(this,event);"><<date>></p>
//
//            You can also disable days of the week by adding arguments to the
//            call to scwShow.  The values should be Sunday = 0 through to
//            Saturday = 6.  A call to scwShow with Friday and Monday disabled
//            would look something like this;
//
//                  scwShow(<<element>>,event,5,1);
//
//            Finally you can use the following technique to run a function
//            when the calendar closes:
//
//                  scwNextAction=<<function>>.runsAfterSCW(this,<<arguments>>);
//                  scwShow(<<element>>,event <<,optional arguments above>>);
//
//            Where <<function>> is a function defined on the calling page
//            and <<arguments>> is the list of arguments being passed to that
//            function.
//
//      No event? No problem!
//
//            Normally the calendar will be triggered by an event but if you wish to
//            control it in code and the event is not available to you, simply pass
//            an element as the second parameter;
//
//            E.G.  scwShow(<<target element>>,<<source element>>);
//                  as in: scwShow(this,this);
//
//            ------------------------------------------------------------------
//            Here's an extremely trivial but fully functioning example page
//            showing two of the ways to trigger the calendar;
//
//            <html>
//                <head><title>Basic Example</title></head>
//                <body>
//                    <script type='text/JavaScript' src='scw.js'></script>
//                    <p onclick='scwShow(this,event);'>06-Dec-2006</p>
//                    <input onclick='scwShow(this,event);' value='07-Dec-2006' />
//                    <br/><br/>
//                    <a href='#' onclick='scwShow(this,event);return false;'>
//                        08-Dec-2006
//                    </a>
//                </body>
//            </html>
//
// *****************************************************************************
//
// See http://www.tarrget.info/calendar/scw.htm for a complete version history
//
// Version   Date        By               Description
// =======   ====        ===============  ===========
//   3.58    2007-04-04  Anthony Garrett  Resolved an error caused when the date
//                                         range does not include the current year.
//                                         Thanks to Steve Davis for letting me know.
//
//                                        Fixed "Today" selector display which
//                                         was incorrectly visible when year range
//                                         ended last year. (Also the result of
//                                         investigations based on Steve Davis'
//                                         feedback).
//
//   3.59    2007-06-13  Anthony Garrett  Added Verdana to font list of
//                                         calendar's CSS.  Resolves rendering
//                                         bug in Safari Beta 3 for Windows.
//
//   3.60    2007-07-31  Anthony Garrett  Fixed javascript error that occurred
//                                         when the target element had no value
//                                         attribute.  The error had no impact
//                                         on the behaviour of the script.  Thanks
//                                         to John Phelps for reporting this bug.
//
//   3.70    2007-09-21  Anthony Garrett  Updated the event trapping to make it
//                                         less intrusive on the page body.
//                                         NOTE: This requires that a calendar's
//                                         second parameter should be the calling
//                                         event (not the calling object as in
//                                         previous versions).
//                                         Thanks to Steve Davis for the bug report
//                                         that led to this change.
//
//                                        Fixed a bug that caused undelimited
//                                         dates to be handled incorrectly. They
//                                         are now parsed against the full date
//                                         output format then checked for validity.
//                                         Thanks to Dan Wood for raising this bug.
//
//                                        Replaced the date input sequence user
//                                         configuration setting with parsing the
//                                         sequence from the full format. New users
//                                         are often confused by the sequence and
//                                         in practice (to allow the calendar's date
//                                         output to be used for input) the sequence
//                                         must always match the full format element
//                                         order.
//
//                                        Extended IFRAME backing to all calendar objects
//                                         in order to improve calendar display over
//                                         some embedded applets and objects.  Thanks to
//                                         Stanko Kupcevic for his feedback on this.
//                                         NOTE: It is not possible to protect any
//                                         JavaScript object displayed over an
//                                         embedded DYNAMIC (and, therefore refreshed)
//                                         object because browsers usually do not
//                                         directly control the screen handling within
//                                         the object.  The best advice therefore remains
//                                         to design pages in such a way that the calendar
//                                         does not overlap embedded objects.
//
//  3.71     2008-12-14  Anthony Garrett  Restored the ability to use an element
//                                         as the second parameter when opening a
//                                         calendar while retaining the option
//                                         of passing an event. Thanks to Thierry Blind
//                                         and Sergey Snovsky for the feedback.
//
//  3.72     2008-02-24  Anthony Garrett  Trapped calls to script with only a
//                                         NAME attribute is set for the target
//                                         element when the script really requires
//                                         an ID attribute.  This is the most
//                                         frequent mistake reported to me.
//
//  3.73     2008-04-11  Anthony Garrett  Corrected the input month name parsing
//                                         so that it set the calendar to the
//                                         right month when long month names used.
//                                         Thanks to Ben Diamand for this bug report.
//
//  3.80     2008-04-29  Anthony Garrett  Added optional auto-positioning of the
//                                         calendar when its normal position would
//                                         go off the visible area.
//                                         Thanks to Chandramouli Iyer for this
//                                         suggestion.
//
//  3.90     2008-05-05  Anthony Garrett  Added an optional "Clear" button for
//                                         use when handling a read-only text
//                                         input element. Thanks to Sanjay Gangwal
//                                         for his suggestion.
// *****************************************************************************

// ************************************
// Start of Simple Calendar Widget Code
// ************************************

// This date is used throughout to determine today's date.

    var scwDateNow = new Date(Date.parse(new Date().toDateString()));

//******************************************************************************
//------------------------------------------------------------------------------
// Customisation section
//------------------------------------------------------------------------------
//******************************************************************************

    // Set the bounds for the calendar here...
    // If you want the year to roll forward you can use something like this...
    //      var scwBaseYear = scwDateNow.getFullYear()-5;
    // alternatively, hard code a date like this...
    //      var scwBaseYear = 1990;

    var scwBaseYear        = scwDateNow.getFullYear()-100;

    // How many years do want to be valid and to show in the drop-down list?

    var scwDropDownYears   = 101;

    // All language-dependent changes can be made here...

    // If you wish to work in a single language (other than English) then
    // just replace the English (in the function scwSetLanguage below) with
    // your own text.

    // Using multiple languages:
    // In order to keep this script to a resonable size I have not included
    // languages here.  You can set language fields in a function that you
    // should call  scwSetLanguage  the script will use your languages.