// 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 (cal.dateClicked )
			// 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 el = document.getElementById(id);
		  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
			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.nextSibling, "Br");        // show the calendar
		
		  return false;
		}