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 show_calendar(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();
	}