var _dynarch_popupCalendar = null;
// 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.
	if (cal.dateClicked && (cal.sel.id == "sel1" || cal.sel.id == "sel3")) {
		// if we add this call we close the calendar on single-click.
		// just to exemplify both cases, we are using this only for the 1st
		// and the 3rd field, while 2nd and 4th will still require double-click.
		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
	//  cal.destroy();
	_dynarch_popupCalendar = null;
}

// 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, showsTime, showsOtherMonths) {
 	var w = window;
	var el = document.getElementById(id);
	_dynarch_popupCalendar = core.calendar;
	if (_dynarch_popupCalendar != null) {
		// we already have some calendar created
		_dynarch_popupCalendar.hide();                 // so we hide it first.
	} else {
		// first-time call, create the calendar.
		var cal = new Calendar(1, null, selected, closeHandler);
		// uncomment the following line to hide the week numbers
		// cal.weekNumbers = false;
		if (typeof showsTime == "string") {
			cal.showsTime = true;
			cal.time24 = (showsTime == "24");
		}
		if (showsOtherMonths) {
			cal.showsOtherMonths = true;
		}
		_dynarch_popupCalendar = cal;                  // remember it in the global var
		core.calendar = cal;                  // remember it in the global var
		cal.setRange(1900, 2070);        // min/max year allowed.
		cal.create();
	}
	_dynarch_popupCalendar.setDateFormat(format);    // set the specified date format
	_dynarch_popupCalendar.parseDate(el.value);      // try to parse the text in field
	_dynarch_popupCalendar.sel = el;                 // inform it what input field we use

	// the reference element that we pass to showAtElement is the button that
	// triggers the calendar.  In this example we align the calendar bottom-right
	// to the button.
	_dynarch_popupCalendar.showAtElement(el);        // show the calendar
	//_dynarch_popupCalendar.showAtElement(el.nextSibling, "Br");        // show the calendar

	return false;
};