var oldLink = null;
	// code to change the active stylesheet
	function setActiveStyleSheet(link, title) {
		var i;
		var a;
		var main;
		for(i=0; (a = document.getElementsByTagName("link")[i]); i++) {
			if(a.getAttribute("rel").indexOf("style") != -1 && a.getAttribute("title")) {
				a.disabled = true;
				if(a.getAttribute("title") == title) a.disabled = false;
			}
		}
		if (oldLink) oldLink.style.fontWeight = 'normal';
		oldLink = link;
		link.style.fontWeight = 'bold';
		return false;
	}

// 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 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;
	}

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

// If this handler returns true then the "date" given as
// parameter will be disabled.  In this example we enable
// only days within a range of 10 days from the current
// date.
// You can use the functions date.getFullYear() -- returns the year
// as 4 digit number, date.getMonth() -- returns the month as 0..11,
// and date.getDate() -- returns the date of the month as 1..31, to
// make heavy calculations here.  However, beware that this function
// should be very fast, as it is called for each day in a month when
// the calendar is (re)constructed.
	function isDisabled(date) {
	  var today = new Date();
	  return (Math.abs(date.getTime() - today.getTime()) / DAY) > 10;
	}

	function flatSelected(cal, date) {
	  var el = document.getElementById("preview");
	  el.innerHTML = date;
	}

	function showFlatCalendar() {
	  var parent = document.getElementById("display");

	  // construct a calendar giving only the "selected" handler.
	  var cal = new Calendar(0, null, flatSelected);

	  // hide week numbers
	  cal.weekNumbers = false;

	  // We want some dates to be disabled; see function isDisabled above
	  cal.setDisabledHandler(isDisabled);
	  cal.setDateFormat("%A, %B %e");

	  // this call must be the last as it might use data initialized above; if
	  // we specify a parent, as opposite to the "showCalendar" function above,
	  // then we create a flat calendar -- not popup.  Hidden, though, but...
	  cal.create(parent);

	  // ... we can show it here.
	  cal.show();
	}