var oldLink = null;
		// code to change the active stylesheet
		function setActiveStyleSheet(link, title) {
		  var i, a, 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();
		}