var calendar = null; // remember the calendar object so that we reuse it and
                     // avoid creation other calendars.

// This function gets called when the end-user clicks on some date.
function selected(cal, date) {
  cal.sel.value = date; // just update the date in the input field.
  cal.callCloseHandler();
}
// And this gets called when the end-user clicks on the _selected_ date,
// or clicks on the "Close" button.  It just hides the calendar without
// destroying it.
function closeHandler(cal) {
  cal.hide();                        // hide the calendar
  // don't check mousedown on document anymore (used to be able to hide the
  // calendar when someone clicks outside it, see the showCalendar function).
  Calendar.removeEvent(document, "mousedown", checkCalendar);
}
// 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.
function checkCalendar(ev) {
  var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
  for (; el != null; el = el.parentNode)
    // FIXME: allow end-user to click some link without closing the
    // calendar.  Good to see real-time stylesheet change :)
    if (el == calendar.element || el.tagName == "A") break;
  if (el == null) {
    // calls closeHandler which should hide the calendar.
    calendar.callCloseHandler();
    Calendar.stopEvent(ev);
  }
}
// This function shows the calendar under the element having the given id.
// It takes care of catching "mousedown" signals on document and hiding the
// calendar if the click was outside.
function showCalendar(id, format) {
  var el = document.getElementById(id);
  if (calendar != null) {
    // we already have some calendar created
    calendar.hide();                 // so we hide it first.
  } else {
    // first-time call, create the calendar.
    var cal = new Calendar(true, null, selected, closeHandler);
    calendar = cal;                  // remember it in the global var
    cal.setRange(1900, 2070);        // min/max year allowed.
  	//cal.setDisabledHandler(isDisabled); // I enabled all the dates
  	cal.setDisabledHandler(false);
    cal.create();
  }
  calendar.setDateFormat(format);    // set the specified date format
  calendar.parseDate(el.value);      // try to parse the text in field
  calendar.sel = el;                 // inform it what input field we use
  calendar.showAtElement(el);        // show the calendar below it

  // catch "mousedown" on document
  Calendar.addEvent(document, "mousedown", checkCalendar);
  return false;
}

var MINUTE = 60 * 1000;
var HOUR = 60 * MINUTE;
var DAY = 24 * HOUR;
var WEEK = 7 * DAY;

function isDisabled(date) {
  var today = new Date();
  return (Math.abs(date.getTime() <= today.getTime()));
}