Javascript fejl i browser

Kode 

<?php
$TITLE = "Vejret i Silkeborg - Vejrgrafer - vælg dag ud fra kalender";
include("top.php");
include("menu.php");
?>
<div id="main-copy">
<h1>
<a href="grafer.php">Klik for grafer</a>  
<a href="multigraf.php">Klik for multigraf</a>  
<a href="scripts/wdmysql_grafer/grafer_mysql.php">Grafer fra MySQL</a>  
<a href="wunderground.php">Grafer fra Wunderground</a><br />Daglige grafer vælg fra den 28. december 2005 og frem</h1>
<table width="675">
	<tr>
		<td width="197">
		<script type="text/javascript" src="kalender/calendar.js"></script>
		<script type="text/javascript" src="kalender/calendar-da.js"></script>
		<script type="text/javascript" src="kalender/calendar-setup.js"></script>
		<script type="text/javascript">
var oldLink = 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 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(2005, 2008);        // 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;
}


//Enter the url to the graph in this function

function flatSelected(cal, date) {
  var el = document.getElementById("preview");
  el.innerHTML = '<img src="http://www.buskelundtoften.dk/vejret/vejrdata/' + date + '.gif" alt="Graf" />';
}

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;
  cal.setRange(2005, 2008);
  cal.firstDayOfWeek = 1;  

  // We want some dates to be disabled; see function isDisabled above
  // The disabled-function is disabled by comment (cal.setDisabled) it out, huh? ;)
  // You can change the dateformat in this function

  //cal.setDisabledHandler(isDisabled);
  cal.setDateFormat("%Y%m%d");

  // 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();
}
</script>

<!-- This script change the theme, possibles is Aqua,winter,blue,summer,green,
win2k-1,win2k-2,win2k-cold-1,win2k-cold-2,system //-->

<script type="text/javascript">
setActiveStyleSheet(document.getElementById("defaultTheme"), "Aqua");
</script>



<!-- This div shows the almanac //-->

<div id="display"></div>
		</td>
		<td width="465">
		<div id="preview" style="font-size: 80%; text-align: center; padding: 2px"><img src="http://www.buskelundtoften.dk/vejret/vejrdata/curr24hourgraph.gif" alt="Grafen for i dag" /></div>
		</td>
	</tr>
</table>
<?php
$doInclude = true;
include("bundtekst.php"); ?>