/*  Copyright Mihai Bazon, 2002, 2003  |  http://students.infoiasi.ro/~mishoo
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar, version 0.9.3 "It's still alive & keeps rocking"
 *
 * Details and latest version at:
 * http://students.infoiasi.ro/~mishoo/site/calendar.epl
 *
 * Feel free to use this script under the terms of the GNU Lesser General
 * Public License, as long as you do not remove or alter this notice.
 */

// $Id: calendar.js,v 1.2 2008/03/04 08:44:36 andrew Exp $

/** The Calendar object constructor. */
Calendar = function (mondayFirst, dateStr, onSelected, onClose) {
  // member variables
  this.activeDiv = null;
  this.currentDateEl = null;
  this.checkDisabled = null;
  this.timeout = null;
  this.onSelected = onSelected || null;
  this.onClose = onClose || null;
  this.dragging = false;
  this.hidden = false;
  this.minYear = 1970;
  this.maxYear = 2050;
  this.dateFormat = Calendar._TT["DEF_DATE_FORMAT"];
  this.ttDateFormat = Calendar._TT["TT_DATE_FORMAT"];
  this.isPopup = true;
  this.weekNumbers = true;
  this.mondayFirst = mondayFirst;
  this.dateStr = dateStr;
  this.ar_days = null;
  // HTML elements
  this.table = null;
  this.element = null;
  this.tbody = null;
  this.firstdayname = null;
  // Combo boxes
  this.monthsCombo = null;
  this.yearsCombo = null;
  this.hilitedMonth = null;
  this.activeMonth = null;
  this.hilitedYear = null;
  this.activeYear = null;
  // Information
  this.dateClicked = false;

  // one-time initializations
  if (!Calendar._DN3) {
    // table of short day names
    var ar = new Array();
    for (var i = 8; i > 0;) {
      ar[--i] = Calendar._DN[i].substr(0, 3);
    }
    Calendar._DN3 = ar;
    // table of short month names
    ar = new Array();
    for (var i = 12; i > 0;) {
      ar[--i] = Calendar._MN[i].substr(0, 3);
    }
    Calendar._MN3 = ar;
  }
};

// ** constants

/// "static", needed for event handlers.
Calendar._C = null;

/// detect a special case of "web browser"
Calendar.is_ie = ( /msie/i.test(navigator.userAgent) &&
       !/opera/i.test(navigator.userAgent) );

// short day names array (initialized at first constructor call)
Calendar._DN3 = null;

// short month names array (initialized at first constructor call)
Calendar._MN3 = null;

// BEGIN: UTILITY FUNCTIONS; beware that these might be moved into a separate
//        library, at some point.

Calendar.getAbsolutePos = function(el) {
  //alert(el.offsetLeft)
  var r = { x: el.offsetLeft, y: el.offsetTop };
  if (el.offsetParent) {
    var tmp = Calendar.getAbsolutePos(el.offsetParent);
    r.x += tmp.x;
    r.y += tmp.y;
  }
  return r;
};

Calendar.isRelated = function (el, evt) {
  var related = evt.relatedTarget;
  if (!related) {
    var type = evt.type;
    if (type == "mouseover") {
      related = evt.fromElement;
    } else if (type == "mouseout") {
      related = evt.toElement;
    }
  }
  while (related) {
    if (related == el) {
      return true;
    }
    related = related.parentNode;
  }
  return false;
};

Calendar.removeClass = function(el, className) {
  if (!(el && el.className)) {
    return;
  }
  var cls = el.className.split(" ");
  var ar = new Array();
  for (var i = cls.length; i > 0;) {
    if (cls[--i] != className) {
      ar[ar.length] = cls[i];
    }
  }
  el.className = ar.join(" ");
};

Calendar.addClass = function(el, className) {
  Calendar.removeClass(el, className);
  el.className += " " + className;
};

Calendar.getElement = function(ev) {
  if (Calendar.is_ie) {
    return window.event.srcElement;
  } else {
    return ev.currentTarget;
  }
};

Calendar.getTargetElement = function(ev) {
  if (Calendar.is_ie) {
    return window.event.srcElement;
  } else {
    return ev.target;
  }
};

Calendar.stopEvent = function(ev) {
  if (Calendar.is_ie) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  } else {
    ev.preventDefault();
    ev.stopPropagation();
  }
  return false;
};

Calendar.addEvent = function(el, evname, func) {
  if (el.attachEvent) { // IE
    el.attachEvent("on" + evname, func);
  } else if (el.addEventListener) { // Gecko / W3C
    el.addEventListener(evname, func, true);
  } else { // Opera (or old browsers)
    el["on" + evname] = func;
  }
};

Calendar.removeEvent = function(el, evname, func) {
  if (el.detachEvent) { // IE
    el.detachEvent("on" + evname, func);
  } else if (el.removeEventListener) { // Gecko / W3C
    el.removeEventListener(evname, func, true);
  } else { // Opera (or old browsers)
    el["on" + evname] = null;
  }
};

Calendar.createElement = function(type, parent) {
  var el = null;
  if (document.createElementNS) {
    // use the XHTML namespace; IE won't normally get here unless
    // _they_ "fix" the DOM2 implementation.
    el = document.createElementNS("http://www.w3.org/1999/xhtml", type);
  } else {
    el = document.createElement(type);
  }
  if (typeof parent != "undefined") {
    parent.appendChild(el);
  }
  return el;
};

// END: UTILITY FUNCTIONS

// BEGIN: CALENDAR STATIC FUNCTIONS

/** Internal -- adds a set of events to make some element behave like a button. */
Calendar._add_evs = function(el) {
  with (Calendar) {
    addEvent(el, "mouseover", dayMouseOver);
    addEvent(el, "mousedown", dayMouseDown);
    addEvent(el, "mouseout", dayMouseOut);
    if (is_ie) {
      addEvent(el, "dblclick", dayMouseDblClick);
      el.setAttribute("unselectable", true);
    }
  }
};

Calendar.findMonth = function(el) {
  if (typeof el.month != "undefined") {
    return el;
  } else if (typeof el.parentNode.month != "undefined") {
    return el.parentNode;
  }
  return null;
};

Calendar.findYear = function(el) {
  if (typeof el.year != "undefined") {
    return el;
  } else if (typeof el.parentNode.year != "undefined") {
    return el.parentNode;
  }
  return null;
};

Calendar.showMonthsCombo = function () {
  var cal = Calendar._C;
  if (!cal) {
    return false;
  }
  var cal = cal;
  var cd = cal.activeDiv;
  var mc = cal.monthsCombo;
  if (cal.hilitedMonth) {
    Calendar.removeClass(cal.hilitedMonth, "hilite");
  }
  if (cal.activeMonth) {
    Calendar.removeClass(cal.activeMonth, "active");
  }
  var mon = cal.monthsCombo.getElementsByTagName("div")[cal.date.getMonth()];
  Calendar.addClass(mon, "active");
  cal.activeMonth = mon;
  mc.style.left = cd.offsetLeft + "px";
  mc.style.top = (cd.offsetTop + cd.offsetHeight) + "px";
  mc.style.display = "block";
};

Calendar.showYearsCombo = function (fwd) {
  var cal = Calendar._C;
  if (!cal) {
    return false;
  }
  var cal = cal;
  var cd = cal.activeDiv;
  var yc = cal.yearsCombo;
  if (cal.hilitedYear) {
    Calendar.removeClass(cal.hilitedYear, "hilite");
  }
  if (cal.activeYear) {
    Calendar.removeClass(cal.activeYear, "active");
  }
  cal.activeYear = null;
  var Y = cal.date.getFullYear() + (fwd ? 1 : -1);
  var yr = yc.firstChild;
  var show = false;
  for (var i = 12; i > 0; --i) {
    if (Y >= cal.minYear && Y <= cal.maxYear) {
      yr.firstChild.data = Y;
      yr.year = Y;
      yr.style.display = "block";
      show = true;
    } else {
      yr.style.display = "none";
    }
    yr = yr.nextSibling;
    Y += fwd ? 2 : -2;
  }
  if (show) {
    yc.style.left = cd.offsetLeft + "px";
    yc.style.top = (cd.offsetTop + cd.offsetHeight) + "px";
    yc.style.display = "block";
  }
};

// event handlers

Calendar.tableMouseUp = function(ev) {
  var cal = Calendar._C;
  if (!cal) {
    return false;
  }
  if (cal.timeout) {
    clearTimeout(cal.timeout);
  }
  var el = cal.activeDiv;
  if (!el) {
    return false;
  }
  var target = Calendar.getTargetElement(ev);
  Calendar.removeClass(el, "active");
  if (target == el || target.parentNode == el) {
    Calendar.cellClick(el);
  }
  var mon = Calendar.findMonth(target);
  var date = null;
  if (mon) {
    date = new Date(cal.date);
    if (mon.month != date.getMonth()) {
      date.setMonth(mon.month);
      cal.setDate(date);
      cal.dateClicked = false;
      cal.callHandler();
    }
  } else {
    var year = Calendar.findYear(target);
    if (year) {
      date = new Date(cal.date);
      if (year.year != date.getFullYear()) {
        date.setFullYear(year.year);
        cal.setDate(date);
        cal.dateClicked = false;
        cal.callHandler();
      }
    }
  }
  with (Calendar) {
    removeEvent(document, "mouseup", tableMouseUp);
    removeEvent(document, "mouseover", tableMouseOver);
    removeEvent(document, "mousemove", tableMouseOver);
    cal._hideCombos();
    _C = null;
    return stopEvent(ev);
  }
};

Calendar.tableMouseOver = function (ev) {
  var cal = Calendar._C;
  if (!cal) {
    return;
  }
  var el = cal.activeDiv;
  var target = Calendar.getTargetElement(ev);
  if (target == el || target.parentNode == el) {
    Calendar.addClass(el, "hilite active");
    Calendar.addClass(el.parentNode, "rowhilite");
  } else {
    Calendar.removeClass(el, "active");
    Calendar.removeClass(el, "hilite");
    Calendar.removeClass(el.parentNode, "rowhilite");
  }
  var mon = Calendar.findMonth(target);
  if (mon) {
    if (mon.month != cal.date.getMonth()) {
      if (cal.hilitedMonth) {
        Calendar.removeClass(cal.hilitedMonth, "hilite");
      }
      Calendar.addClass(mon, "hilite");
      cal.hilitedMonth = mon;
    } else if (cal.hilitedMonth) {
      Calendar.removeClass(cal.hilitedMonth, "hilite");
    }
  } else {
    var year = Calendar.findYear(target);
    if (year) {
      if (year.year != cal.date.getFullYear()) {
        if (cal.hilitedYear) {
          Calendar.removeClass(cal.hilitedYear, "hilite");
        }
        Calendar.addClass(year, "hilite");
        cal.hilitedYear = year;
      } else if (cal.hilitedYear) {
        Calendar.removeClass(cal.hilitedYear, "hilite");
      }
    }
  }
  return Calendar.stopEvent(ev);
};

Calendar.tableMouseDown = function (ev) {
  if (Calendar.getTargetElement(ev) == Calendar.getElement(ev)) {
    return Calendar.stopEvent(ev);
  }
};

Calendar.calDragIt = function (ev) {
  var cal = Calendar._C;
  if (!(cal && cal.dragging)) {
    return false;
  }
  var posX;
  var posY;
  if (Calendar.is_ie) {
    posY = window.event.clientY + document.body.scrollTop;
    posX = window.event.clientX + document.body.scrollLeft;
  } else {
    posX = ev.pageX;
    posY = ev.pageY;
  }
  cal.hideShowCovered();
  var st = cal.element.style;
  st.left = (posX - cal.xOffs) + "px";
  st.top = (posY - cal.yOffs) + "px";
  return Calendar.stopEvent(ev);
};

Calendar.calDragEnd = function (ev) {
  var cal = Calendar._C;
  if (!cal) {
    return false;
  }
  cal.dragging = false;
  with (Calendar) {
    removeEvent(document, "mousemove", calDragIt);
    removeEvent(document, "mouseover", stopEvent);
    removeEvent(document, "mouseup", calDragEnd);
    tableMouseUp(ev);
  }
  cal.hideShowCovered();
};

Calendar.dayMouseDown = function(ev) {
  var el = Calendar.getElement(ev);
  if (el.disabled) {
    return false;
  }
  var cal = el.calendar;
  cal.activeDiv = el;
  Calendar._C = cal;
  if (el.navtype != 300) with (Calendar) {
    addClass(el, "hilite active");
    addEvent(document, "mouseover", tableMouseOver);
    addEvent(document, "mousemove", tableMouseOver);
    addEvent(document, "mouseup", tableMouseUp);
  } else if (cal.isPopup) {
    cal._dragStart(ev);
  }
  if (el.navtype == -1 || el.navtype == 1) {
    cal.timeout = setTimeout("Calendar.showMonthsCombo()", 250);
  } else if (el.navtype == -2 || el.navtype == 2) {
    cal.timeout = setTimeout((el.navtype > 0) ? "Calendar.showYearsCombo(true)" : "Calendar.showYearsCombo(false)", 250);
  } else {
    cal.timeout = null;
  }
  return Calendar.stopEvent(ev);
};

Calendar.dayMouseDblClick = function(ev) {
  Calendar.cellClick(Calendar.getElement(ev));
  if (Calendar.is_ie) {
    document.selection.empty();
  }
};

Calendar.dayMouseOver = function(ev) {
  var el = Calendar.getElement(ev);
  if (Calendar.isRelated(el, ev) || Calendar._C || el.disabled) {
    return false;
  }
  if (el.ttip) {
    if (el.ttip.substr(0, 1) == "_") {
      var date = null;
      with (el.calendar.date) {
        date = new Date(getFullYear(), getMonth(), el.caldate);
      }
      el.ttip = date.print(el.calendar.ttDateFormat) + el.ttip.substr(1);
    }
    el.calendar.tooltips.firstChild.data = el.ttip;
  }
  if (el.navtype != 300) {
    Calendar.addClass(el, "hilite");
    if (el.caldate) {
      Calendar.addClass(el.parentNode, "rowhilite");
    }
  }
  return Calendar.stopEvent(ev);
};

Calendar.dayMouseOut = function(ev) {
  with (Calendar) {
    var el = getElement(ev);
    if (isRelated(el, ev) || _C || el.disabled) {
      return false;
    }
    removeClass(el, "hilite");
    if (el.caldate) {
      removeClass(el.parentNode, "rowhilite");
    }
    el.calendar.tooltips.firstChild.data = _TT["SEL_DATE"];
    return stopEvent(ev);
  }
};

/**
 *  A generic "click" handler :) handles all types of buttons defined in this
 *  calendar.
 */
Calendar.cellClick = function(el) {
  var cal = el.calendar;
  var closing = false;
  var newdate = false;
  var date = null;
  if (typeof el.navtype == "undefined") {
    Calendar.removeClass(cal.currentDateEl, "selected");
    Calendar.addClass(el, "selected");
    closing = (cal.currentDateEl == el);
    if (!closing) {
      cal.currentDateEl = el;
    }
    cal.date.setDate(el.caldate);
    date = cal.date;
    newdate = true;
    // a date was clicked
    cal.dateClicked = true;
  } else {
    if (el.navtype == 200) {
      Calendar.removeClass(el, "hilite");
      cal.callCloseHandler();
      return;
    }
    date = (el.navtype == 0) ? new Date() : new Date(cal.date);
    // unless "today" was clicked, we assume no date was clicked so
    // the selected handler will know not to close the calenar when
    // in single-click mode.
    cal.dateClicked = (el.navtype == 0);
    var year = date.getFullYear();
    var mon = date.getMonth();
    function setMonth(m) {
      var day = date.getDate();
      var max = date.getMonthDays(m);
      if (day > max) {
        date.setDate(max);
      }
      date.setMonth(m);
    };
    switch (el.navtype) {
        case -2:
      if (year > cal.minYear) {
        date.setFullYear(year - 1);
      }
      break;
        case -1:
      if (mon > 0) {
        setMonth(mon - 1);
      } else if (year-- > cal.minYear) {
        date.setFullYear(year);
        setMonth(11);
      }
      break;
        case 1:
      if (mon < 11) {
        setMonth(mon + 1);
      } else if (year < cal.maxYear) {
        date.setFullYear(year + 1);
        setMonth(0);
      }
      break;
        case 2:
      if (year < cal.maxYear) {
        date.setFullYear(year + 1);
      }
      break;
        case 100:
      cal.setMondayFirst(!cal.mondayFirst);
      return;
        case 0:
      // TODAY will bring us here
      if ((typeof cal.checkDisabled == "function") && cal.checkDisabled(date)) {
        // remember, "date" was previously set to new
        // Date() if TODAY was clicked; thus, it
        // contains today date.
        return false;
      }
      break;
    }
    if (!date.equalsTo(cal.date)) {
      cal.setDate(date);
      newdate = true;
    }
  }
  if (newdate) {
    cal.callHandler();
  }
  if (closing) {
    Calendar.removeClass(el, "hilite");
    cal.callCloseHandler();
  }
  //calendar.hide();
};

// END: CALENDAR STATIC FUNCTIONS

// BEGIN: CALENDAR OBJECT FUNCTIONS

/**
 *  This function creates the calendar inside the given parent.  If _par is
 *  null than it creates a popup calendar inside the BODY element.  If _par is
 *  an element, be it BODY, then it creates a non-popup calendar (still
 *  hidden).  Some properties need to be set before calling this function.
 */
Calendar.prototype.create = function (_par) {
  var parent = null;
  if (! _par) {
    // default parent is the document body, in which case we create
    // a popup calendar.
    parent = document.getElementsByTagName("body")[0];
    this.isPopup = true;
  } else {
    parent = _par;
    this.isPopup = false;
  }
  this.date = this.dateStr ? new Date(this.dateStr) : new Date();

  var table = Calendar.createElement("table");
  this.table = table;
  table.cellSpacing = 0;
  table.cellPadding = 0;
  table.calendar = this;
  Calendar.addEvent(table, "mousedown", Calendar.tableMouseDown);

  var div = Calendar.createElement("div");
  this.element = div;
  div.className = "calendar";
  if (this.isPopup) {
    div.style.position = "absolute";
    div.style.display = "none";
  }
  div.appendChild(table);

  var thead = Calendar.createElement("thead", table);
  var cell = null;
  var row = null;

  var cal = this;
  var hh = function (text, cs, navtype) {
    cell = Calendar.createElement("td", row);
    cell.colSpan = cs;
    cell.className = "button";
    Calendar._add_evs(cell);
    cell.calendar = cal;
    cell.navtype = navtype;
    if (text.substr(0, 1) != "&") {
      cell.appendChild(document.createTextNode(text));
    }
    else {
      // FIXME: dirty hack for entities
      cell.innerHTML = text;
    }
    return cell;
  };

  row = Calendar.createElement("tr", thead);
  var title_length = 6;
  (this.isPopup) && --title_length;
  (this.weekNumbers) && ++title_length;

  hh("-", 1, 100).ttip = Calendar._TT["TOGGLE"];
  this.title = hh("", title_length, 300);
  this.title.className = "title";
  if (this.isPopup) {
    this.title.ttip = Calendar._TT["DRAG_TO_MOVE"];
    this.title.style.cursor = "move";
    hh("&#x00d7;", 1, 200).ttip = Calendar._TT["CLOSE"];
  }

  row = Calendar.createElement("tr", thead);
  row.className = "headrow";

  this._nav_py = hh("&#x00ab;", 1, -2);
  this._nav_py.ttip = Calendar._TT["PREV_YEAR"];

  this._nav_pm = hh("&#x2039;", 1, -1);
  this._nav_pm.ttip = Calendar._TT["PREV_MONTH"];

  this._nav_now = hh(Calendar._TT["TODAY"], this.weekNumbers ? 4 : 3, 0);
  this._nav_now.ttip = Calendar._TT["GO_TODAY"];

  this._nav_nm = hh("&#x203a;", 1, 1);
  this._nav_nm.ttip = Calendar._TT["NEXT_MONTH"];

  this._nav_ny = hh("&#x00bb;", 1, 2);
  this._nav_ny.ttip = Calendar._TT["NEXT_YEAR"];

  // day names
  row = Calendar.createElement("tr", thead);
  row.className = "daynames";
  if (this.weekNumbers) {
    cell = Calendar.createElement("td", row);
    cell.className = "name wn";
    cell.appendChild(document.createTextNode(Calendar._TT["WK"]));
  }
  for (var i = 7; i > 0; --i) {
    cell = Calendar.createElement("td", row);
    cell.appendChild(document.createTextNode(""));
    if (!i) {
      cell.navtype = 100;
      cell.calendar = this;
      Calendar._add_evs(cell);
    }
  }
  this.firstdayname = (this.weekNumbers) ? row.firstChild.nextSibling : row.firstChild;
  this._displayWeekdays();

  var tbody = Calendar.createElement("tbody", table);
  this.tbody = tbody;

  for (i = 6; i > 0; --i) {
    row = Calendar.createElement("tr", tbody);
    if (this.weekNumbers) {
      cell = Calendar.createElement("td", row);
      cell.appendChild(document.createTextNode(""));
    }
    for (var j = 7; j > 0; --j) {
      cell = Calendar.createElement("td", row);
      cell.appendChild(document.createTextNode(""));
      cell.calendar = this;
      Calendar._add_evs(cell);
    }
  }

  var tfoot = Calendar.createElement("tfoot", table);

  row = Calendar.createElement("tr", tfoot);
  row.className = "footrow";

  cell = hh(Calendar._TT["SEL_DATE"], this.weekNumbers ? 8 : 7, 300);
  cell.className = "ttip";
  if (this.isPopup) {
    cell.ttip = Calendar._TT["DRAG_TO_MOVE"];
    cell.style.cursor = "move";
  }
  this.tooltips = cell;

  div = Calendar.createElement("div", this.element);
  this.monthsCombo = div;
  div.className = "combo";
  for (i = 0; i < Calendar._MN.length; ++i) {
    var mn = Calendar.createElement("div");
    mn.className = "label";
    mn.month = i;
    mn.appendChild(document.createTextNode(Calendar._MN3[i]));
    div.appendChild(mn);
  }

  div = Calendar.createElement("div", this.element);
  this.yearsCombo = div;
  div.className = "combo";
  for (i = 12; i > 0; --i) {
    var yr = Calendar.createElement("div");
    yr.className = "label";
    yr.appendChild(document.createTextNode(""));
    div.appendChild(yr);
  }

  this._init(this.mondayFirst, this.date);
  parent.appendChild(this.element);
};

/** keyboard navigation, only for popup calendars */
Calendar._keyEvent = function(ev) {
  if (!window.calendar) {
    return false;
  }
  (Calendar.is_ie) && (ev = window.event);
  var cal = window.calendar;
  var act = (Calendar.is_ie || ev.type == "keypress");
  if (ev.ctrlKey) {
    switch (ev.keyCode) {
        case 37: // KEY left
      act && Calendar.cellClick(cal._nav_pm);
      break;
        case 38: // KEY up
      act && Calendar.cellClick(cal._nav_py);
      break;
        case 39: // KEY right
      act && Calendar.cellClick(cal._nav_nm);
      break;
        case 40: // KEY down
      act && Calendar.cellClick(cal._nav_ny);
      break;
        default:
      return false;
    }
  } else switch (ev.keyCode) {
      case 32: // KEY space (now)
    Calendar.cellClick(cal._nav_now);
    break;
      case 27: // KEY esc
    act && cal.hide();
    break;
      case 37: // KEY left
      case 38: // KEY up
      case 39: // KEY right
      case 40: // KEY down
    if (act) {
      var date = cal.date.getDate() - 1;
      var el = cal.currentDateEl;
      var ne = null;
      var prev = (ev.keyCode == 37) || (ev.keyCode == 38);
      switch (ev.keyCode) {
          case 37: // KEY left
        (--date >= 0) && (ne = cal.ar_days[date]);
        break;
          case 38: // KEY up
        date -= 7;
        (date >= 0) && (ne = cal.ar_days[date]);
        break;
          case 39: // KEY right
        (++date < cal.ar_days.length) && (ne = cal.ar_days[date]);
        break;
          case 40: // KEY down
        date += 7;
        (date < cal.ar_days.length) && (ne = cal.ar_days[date]);
        break;
      }
      if (!ne) {
        if (prev) {
          Calendar.cellClick(cal._nav_pm);
        } else {
          Calendar.cellClick(cal._nav_nm);
        }
        date = (prev) ? cal.date.getMonthDays() : 1;
        el = cal.currentDateEl;
        ne = cal.ar_days[date - 1];
      }
      Calendar.removeClass(el, "selected");
      Calendar.addClass(ne, "selected");
      cal.date.setDate(ne.caldate);
      cal.callHandler();
      cal.currentDateEl = ne;
    }
    break;
      case 13: // KEY enter
    if (act) {
      cal.callHandler();
      cal.hide();
    }
    break;
      default:
    return false;
  }
  return Calendar.stopEvent(ev);
};

/**
 *  (RE)Initializes the calendar to the given date and style (if mondayFirst is
 *  true it makes Monday the first day of week, otherwise the weeks start on
 *  Sunday.
 */
Calendar.prototype._init = function (mondayFirst, date) {
  var today = new Date();
  var year = date.getFullYear();
  if (year < this.minYear) {
    year = this.minYear;
    date.setFullYear(year);
  } else if (year > this.maxYear) {
    year = this.maxYear;
    date.setFullYear(year);
  }
  this.mondayFirst = mondayFirst;
  this.date = new Date(date);
  var month = date.getMonth();
  var mday = date.getDate();
  var no_days = date.getMonthDays();
  date.setDate(1);
  var wday = date.getDay();
  var MON = mondayFirst ? 1 : 0;
  var SAT = mondayFirst ? 5 : 6;
  var SUN = mondayFirst ? 6 : 0;
  if (mondayFirst) {
    wday = (wday > 0) ? (wday - 1) : 6;
  }
  var iday = 1;
  var row = this.tbody.firstChild;
  var MN = Calendar._MN3[month];
  var hasToday = ((today.getFullYear() == year) && (today.getMonth() == month));
  var todayDate = today.getDate();
  var week_number = date.getWeekNumber();
  var ar_days = new Array();
  for (var i = 0; i < 6; ++i) {
    if (iday > no_days) {
      row.className = "emptyrow";
      row = row.nextSibling;
      continue;
    }
    var cell = row.firstChild;
    if (this.weekNumbers) {
      cell.className = "day wn";
      cell.firstChild.data = week_number;
      cell = cell.nextSibling;
    }
    ++week_number;
    row.className = "daysrow";
    for (var j = 0; j < 7; ++j) {
      cell.className = "day";
      if ((!i && j < wday) || iday > no_days) {
        // cell.className = "emptycell";
        cell.innerHTML = "&nbsp;";
        cell.disabled = true;
        cell = cell.nextSibling;
        continue;
      }
      cell.disabled = false;
      cell.firstChild.data = iday;
      if (typeof this.checkDisabled == "function") {
        date.setDate(iday);
        if (this.checkDisabled(date)) {
          cell.className += " disabled";
          cell.disabled = true;
        }
      }
      if (!cell.disabled) {
        ar_days[ar_days.length] = cell;
        cell.caldate = iday;
        cell.ttip = "_";
        if (iday == mday) {
          cell.className += " selected";
          this.currentDateEl = cell;
        }
        if (hasToday && (iday == todayDate)) {
          cell.className += " today";
          cell.ttip += Calendar._TT["PART_TODAY"];
        }
        if (wday == SAT || wday == SUN) {
          cell.className += " weekend";
        }
      }
      ++iday;
      ((++wday) ^ 7) || (wday = 0);
      cell = cell.nextSibling;
    }
    row = row.nextSibling;
  }
  this.ar_days = ar_days;
  this.title.firstChild.data = Calendar._MN[month] + ", " + year;
  // PROFILE
  // this.tooltips.firstChild.data = "Generated in " + ((new Date()) - today) + " ms";
};

/**
 *  Calls _init function above for going to a certain date (but only if the
 *  date is different than the currently selected one).
 */
Calendar.prototype.setDate = function (date) {
  if (!date.equalsTo(this.date)) {
    this._init(this.mondayFirst, date);
  }
};

/**
 *  Refreshes the calendar.  Useful if the "disabledHandler" function is
 *  dynamic, meaning that the list of disabled date can change at runtime.
 *  Just * call this function if you think that the list of disabled dates
 *  should * change.
 */
Calendar.prototype.refresh = function () {
  this._init(this.mondayFirst, this.date);
};

/** Modifies the "mondayFirst" parameter (EU/US style). */
Calendar.prototype.setMondayFirst = function (mondayFirst) {
  this._init(mondayFirst, this.date);
  this._displayWeekdays();
};

/**
 *  Allows customization of what dates are enabled.  The "unaryFunction"
 *  parameter must be a function object that receives the date (as a JS Date
 *  object) and returns a boolean value.  If the returned value is true then
 *  the passed date will be marked as disabled.
 */
Calendar.prototype.setDisabledHandler = function (unaryFunction) {
  this.checkDisabled = unaryFunction;
};

/** Customization of allowed year range for the calendar. */
Calendar.prototype.setRange = function (a, z) {
  this.minYear = a;
  this.maxYear = z;
};

/** Calls the first user handler (selectedHandler). */
Calendar.prototype.callHandler = function () {
  if (this.onSelected) {
    this.onSelected(this, this.date.print(this.dateFormat));
  }
};

/** Calls the second user handler (closeHandler). */
Calendar.prototype.callCloseHandler = function () {
  if (this.onClose) {
    this.onClose(this);
  }
  this.hideShowCovered();
};

/** Removes the calendar object from the DOM tree and destroys it. */
Calendar.prototype.destroy = function () {
  var el = this.element.parentNode;
  el.removeChild(this.element);
  Calendar._C = null;
};

/**
 *  Moves the calendar element to a different section in the DOM tree (changes
 *  its parent).
 */
Calendar.prototype.reparent = function (new_parent) {
  var el = this.element;
  el.parentNode.removeChild(el);
  new_parent.appendChild(el);
};

// This gets called when the user presses a mouse button anywhere in the
// document, if the calendar is shown.  If the click was outside the open
// calendar this function closes it.
Calendar._checkCalendar = function(ev) {
  if (!window.calendar) {
    return false;
  }
  var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
  for (; el != null && el != calendar.element; el = el.parentNode);
  if (el == null) {
    // calls closeHandler which should hide the calendar.
    window.calendar.callCloseHandler();
    return Calendar.stopEvent(ev);
  }
};

/** Shows the calendar. */
Calendar.prototype.show = function () {
  var rows = this.table.getElementsByTagName("tr");
  for (var i = rows.length; i > 0;) {
    var row = rows[--i];
    Calendar.removeClass(row, "rowhilite");
    var cells = row.getElementsByTagName("td");
    for (var j = cells.length; j > 0;) {
      var cell = cells[--j];
      Calendar.removeClass(cell, "hilite");
      Calendar.removeClass(cell, "active");
    }
  }
  this.element.style.display = "block";
  this.hidden = false;
  if (this.isPopup) {
    window.calendar = this;
    Calendar.addEvent(document, "keydown", Calendar._keyEvent);
    Calendar.addEvent(document, "keypress", Calendar._keyEvent);
    Calendar.addEvent(document, "mousedown", Calendar._checkCalendar);
  }
  this.hideShowCovered();
};

/**
 *  Hides the calendar.  Also removes any "hilite" from the class of any TD
 *  element.
 */
Calendar.prototype.hide = function () {
  if (this.isPopup) {
    Calendar.removeEvent(document, "keydown", Calendar._keyEvent);
    Calendar.removeEvent(document, "keypress", Calendar._keyEvent);
    Calendar.removeEvent(document, "mousedown", Calendar._checkCalendar);
  }
  this.element.style.display = "none";
  this.hidden = true;
  this.hideShowCovered();
};

/**
 *  Shows the calendar at a given absolute position (beware that, depending on
 *  the calendar element style -- position property -- this might be relative
 *  to the parent's containing rectangle).
 */
Calendar.prototype.showAt = function (x, y) {
  var s = this.element.style;
  s.left = x + "px";
  s.top = y + "px";
  this.show();
};

/** Shows the calendar near a given element. */
Calendar.prototype.showAtElement = function (el, opts) {

  var p = Calendar.getAbsolutePos(el);
  if (!opts || typeof opts != "string") {
    this.showAt(p.x, p.y + el.offsetHeight);
    return true;
  }
  this.show();
  var w = this.element.offsetWidth;
  var h = this.element.offsetHeight;
  this.hide();
  var valign = opts.substr(0, 1);
  var halign = "l";
  if (opts.length > 1) {
    halign = opts.substr(1, 1);
  }
  // vertical alignment
        switch (valign) {
      case "T": p.y -= h; break;
      case "B": p.y += el.offsetHeight; break;
      case "C": p.y += (el.offsetHeight - h) / 2; break;
      case "t": p.y += el.offsetHeight - h; break;
      case "b": break; // already there
        }
  // horizontal alignment
  switch (halign) {
      case "L": p.x -= w; break;
      case "R": p.x += el.offsetWidth; break;
      case "C": p.x += (el.offsetWidth - w) / 2; break;
      case "r": p.x += el.offsetWidth - w; break;
      case "l": break; // already there
  }
  //this.showAt(el.offsetLeft+300,el.offsetTop);
  this.showAt(p.x, p.y);
};

/** Customizes the date format. */
Calendar.prototype.setDateFormat = function (str) {
  this.dateFormat = str;
};

/** Customizes the tooltip date format. */
Calendar.prototype.setTtDateFormat = function (str) {
  this.ttDateFormat = str;
};

/**
 *  Tries to identify the date represented in a string.  If successful it also
 *  calls this.setDate which moves the calendar to the given date.
 */
Calendar.prototype.parseDate = function (str, fmt) {
  var y = 0;
  var m = -1;
  var d = 0;
  var a = str.split(/\W+/);
  if (!fmt) {
    fmt = this.dateFormat;
  }
  var b = fmt.split(/\W+/);
  var i = 0, j = 0;
  for (i = 0; i < a.length; ++i) {
    if (b[i] == "D" || b[i] == "DD") {
      continue;
    }
    if (b[i] == "d" || b[i] == "dd") {
      d = parseInt(a[i], 10);
    }
    if (b[i] == "m" || b[i] == "mm") {
      m = parseInt(a[i], 10) - 1;
    }
    if ((b[i] == "y") || (b[i] == "yy")) {
      y = parseInt(a[i], 10);
      (y < 100) && (y += (y > 29) ? 1900 : 2000);
    }
    if (b[i] == "M" || b[i] == "MM") {
      for (j = 0; j < 12; ++j) {
        if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { m = j; break; }
      }
    }
  }
  if (y != 0 && m != -1 && d != 0) {
    this.setDate(new Date(y, m, d));
    return;
  }
  y = 0; m = -1; d = 0;
  for (i = 0; i < a.length; ++i) {
    if (a[i].search(/[a-zA-Z]+/) != -1) {
      var t = -1;
      for (j = 0; j < 12; ++j) {
        if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { t = j; break; }
      }
      if (t != -1) {
        if (m != -1) {
          d = m+1;
        }
        m = t;
      }
    } else if (parseInt(a[i], 10) <= 12 && m == -1) {
      m = a[i]-1;
    } else if (parseInt(a[i], 10) > 31 && y == 0) {
      y = parseInt(a[i], 10);
      (y < 100) && (y += (y > 29) ? 1900 : 2000);
    } else if (d == 0) {
      d = a[i];
    }
  }
  if (y == 0) {
    var today = new Date();
    y = today.getFullYear();
  }
  if (m != -1 && d != 0) {
    this.setDate(new Date(y, m, d));
  }
};

Calendar.prototype.hideShowCovered = function () {
  function getStyleProp(obj, style){
    var value = obj.style[style];
    if (!value) {
      if (document.defaultView && typeof (document.defaultView.getComputedStyle) == "function") { // Gecko, W3C
        value = document.defaultView.
          getComputedStyle(obj, "").getPropertyValue(style);
      } else if (obj.currentStyle) { // IE
        value = obj.currentStyle[style];
      } else {
        value = obj.style[style];
      }
    }
    return value;
  };

  var tags = new Array("applet", "iframe", "select");
  var el = this.element;

  var p = Calendar.getAbsolutePos(el);
  var EX1 = p.x;
  var EX2 = el.offsetWidth + EX1;
  var EY1 = p.y;
  var EY2 = el.offsetHeight + EY1;

  for (var k = tags.length; k > 0; ) {
    var ar = document.getElementsByTagName(tags[--k]);
    var cc = null;

    for (var i = ar.length; i > 0;) {
      cc = ar[--i];

      p = Calendar.getAbsolutePos(cc);
      var CX1 = p.x;
      var CX2 = cc.offsetWidth + CX1;
      var CY1 = p.y;
      var CY2 = cc.offsetHeight + CY1;

      if (this.hidden || (CX1 > EX2) || (CX2 < EX1) || (CY1 > EY2) || (CY2 < EY1)) {
        if (!cc.__msh_save_visibility) {
          cc.__msh_save_visibility = getStyleProp(cc, "visibility");
        }
        cc.style.visibility = cc.__msh_save_visibility;
      } else {
        if (!cc.__msh_save_visibility) {
          cc.__msh_save_visibility = getStyleProp(cc, "visibility");
        }
        cc.style.visibility = "hidden";
      }
    }
  }
};

/** Internal function; it displays the bar with the names of the weekday. */
Calendar.prototype._displayWeekdays = function () {
  var MON = this.mondayFirst ? 0 : 1;
  var SUN = this.mondayFirst ? 6 : 0;
  var SAT = this.mondayFirst ? 5 : 6;
  var cell = this.firstdayname;
  for (var i = 0; i < 7; ++i) {
    cell.className = "day name";
    if (!i) {
      cell.ttip = this.mondayFirst ? Calendar._TT["SUN_FIRST"] : Calendar._TT["MON_FIRST"];
      cell.navtype = 100;
      cell.calendar = this;
      Calendar._add_evs(cell);
    }
    if (i == SUN || i == SAT) {
      Calendar.addClass(cell, "weekend");
    }
    cell.firstChild.data = Calendar._DN3[i + 1 - MON];
    cell = cell.nextSibling;
  }
};

/** Internal function.  Hides all combo boxes that might be displayed. */
Calendar.prototype._hideCombos = function () {
  this.monthsCombo.style.display = "none";
  this.yearsCombo.style.display = "none";
};

/** Internal function.  Starts dragging the element. */
Calendar.prototype._dragStart = function (ev) {
  if (this.dragging) {
    return;
  }
  this.dragging = true;
  var posX;
  var posY;
  if (Calendar.is_ie) {
    posY = window.event.clientY + document.body.scrollTop;
    posX = window.event.clientX + document.body.scrollLeft;
  } else {
    posY = ev.clientY + window.scrollY;
    posX = ev.clientX + window.scrollX;
  }
  var st = this.element.style;
  this.xOffs = posX - parseInt(st.left);
  this.yOffs = posY - parseInt(st.top);
  with (Calendar) {
    addEvent(document, "mousemove", calDragIt);
    addEvent(document, "mouseover", stopEvent);
    addEvent(document, "mouseup", calDragEnd);
  }
};

// BEGIN: DATE OBJECT PATCHES

/** Adds the number of days array to the Date object. */
Date._MD = new Array(31,28,31,30,31,30,31,31,30,31,30,31);

/** Constants used for time computations */
Date.SECOND = 1000 /* milliseconds */;
Date.MINUTE = 60 * Date.SECOND;
Date.HOUR   = 60 * Date.MINUTE;
Date.DAY    = 24 * Date.HOUR;
Date.WEEK   =  7 * Date.DAY;

/** Returns the number of days in the current month */
Date.prototype.getMonthDays = function(month) {
  var year = this.getFullYear();
  if (typeof month == "undefined") {
    month = this.getMonth();
  }
  if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
    return 29;
  } else {
    return Date._MD[month];
  }
};

/** Returns the number of the week.  The algorithm was "stolen" from PPK's
 * website, hope it's correct :) http://www.xs4all.nl/~ppk/js/week.html */
Date.prototype.getWeekNumber = function() {
  var now = new Date(this.getFullYear(), this.getMonth(), this.getDate(), 0, 0, 0);
  var then = new Date(this.getFullYear(), 0, 1, 0, 0, 0);
  var time = now - then;
  var day = then.getDay();
  (day > 3) && (day -= 4) || (day += 3);
  return Math.round(((time / Date.DAY) + day) / 7);
};

/** Checks dates equality (ignores time) */
Date.prototype.equalsTo = function(date) {
  return ((this.getFullYear() == date.getFullYear()) &&
    (this.getMonth() == date.getMonth()) &&
    (this.getDate() == date.getDate()));
};

/** Prints the date in a string according to the given format. */
Date.prototype.print = function (frm) {
  var str = new String(frm);
  var m = this.getMonth();
  var d = this.getDate();
  var y = this.getFullYear();
  var wn = this.getWeekNumber();
  var w = this.getDay();
  var s = new Array();
  s["d"] = d;
  s["dd"] = (d < 10) ? ("0" + d) : d;
  s["m"] = 1+m;
  s["mm"] = (m < 9) ? ("0" + (1+m)) : (1+m);
  s["y"] = y;
  s["yy"] = new String(y).substr(2, 2);
  s["w"] = wn;
  s["ww"] = (wn < 10) ? ("0" + wn) : wn;
  with (Calendar) {
    s["D"] = _DN3[w];
    s["DD"] = _DN[w];
    s["M"] = _MN3[m];
    s["MM"] = _MN[m];
  }
  var re = /(.*)(\W|^)(d|dd|m|mm|y|yy|MM|M|DD|D|w|ww)(\W|$)(.*)/;
  while (re.exec(str) != null) {
    str = RegExp.$1 + RegExp.$2 + s[RegExp.$3] + RegExp.$4 + RegExp.$5;
  }
  return str;
};

// END: DATE OBJECT PATCHES

// global object that remembers the calendar
window.calendar = null;