function initHelpers() {
  if ($('ctl00_cphContent_hbSearch_dropArriveDay')) prefix = 'ctl00_cphContent_hbSearch_';
  if ($('ctl00_cphContent_dropArriveDay')) prefix = 'ctl00_cphContent_';
  if ($('ctl00_cphContent_hbQuickbook_dropArriveDay')) prefix = 'ctl00_cphContent_hbQuickbook_';
  if ($('ctl00_cphPopup_hbQuickbook_dropArriveDay')) prefix = 'ctl00_cphPopup_hbQuickbook_';
  if (prefix != '' && YAHOO) initDates();
  initPopup(document);
}

function initDates() {
  addEvent($(prefix + 'dropArriveDay'), 'change', updateDates);
  addEvent($(prefix + 'dropArriveMonth'), 'change', updateDates);
  addEvent($(prefix + 'dropArriveYear'), 'change', updateDates);
  addEvent($(prefix + 'dropLeaveDay'), 'change', updateDates);
  addEvent($(prefix + 'dropLeaveMonth'), 'change', updateDates);
  addEvent($(prefix + 'dropLeaveYear'), 'change', updateDates);

  if ($('arriveCalPop')) {
    YAHOO.namespace("hb.calendar");
    YAHOO.hb.calendar.init = function() {
      YAHOO.hb.calendar.cal1 = new YAHOO.widget.Calendar("cal1", "arriveCalPop", { title: "Arrival date", mindate: "1/1/2008", maxdate: "12/31/2010", close: true });
      YAHOO.hb.calendar.cal1.render();
      YAHOO.hb.calendar.cal1.selectEvent.subscribe(handleSelect1, YAHOO.hb.calendar.cal1, true);
      YAHOO.util.Event.addListener("arriveCalBtn", "click", YAHOO.hb.calendar.cal1.show, YAHOO.hb.calendar.cal1, true);

      YAHOO.hb.calendar.cal2 = new YAHOO.widget.Calendar("cal2", "leaveCalPop", { title: "Leaving date", mindate: "1/1/2008", maxdate: "12/31/2010", close: true });
      YAHOO.hb.calendar.cal2.render();
      YAHOO.hb.calendar.cal2.selectEvent.subscribe(handleSelect2, YAHOO.hb.calendar.cal2, true);
      YAHOO.util.Event.addListener("leaveCalBtn", "click", YAHOO.hb.calendar.cal2.show, YAHOO.hb.calendar.cal2, true);
    }
    YAHOO.hb.calendar.init();
  }

  updateDates(null);
  stayClicked(null);

  if ($(prefix + 'txtLocation') && ($(prefix + 'txtLocation').value == '' | $(prefix + 'txtLocation').value == 'UK')) {
    $(prefix + 'txtLocation').className = 'watermark';
    $(prefix + 'txtLocation').value = 'location or postcode';
    addEvent($(prefix + 'txtLocation'), 'click', locationClicked);
  }

  if ($(prefix + 'chkStay')) {
    addEvent($(prefix + 'chkStay'), 'click', stayClicked);
  }
}

function handleSelect1(type, args, obj) {
  var dates = args[0];
  var date = dates[0];
  var year = date[0], month = date[1], day = date[2];

  setSelectedValue(prefix + 'dropArriveYear', year);
  setSelectedValue(prefix + 'dropArriveMonth', month);
  setSelectedValue(prefix + 'dropArriveDay', day);
  YAHOO.hb.calendar.cal1.hide();
  updateDates(null, 'no');
}

function handleSelect2(type, args, obj) {
  var dates = args[0];
  var date = dates[0];
  var year = date[0], month = date[1], day = date[2];

  setSelectedValue(prefix + 'dropLeaveYear', year);
  setSelectedValue(prefix + 'dropLeaveMonth', month);
  setSelectedValue(prefix + 'dropLeaveDay', day);
  YAHOO.hb.calendar.cal2.hide();
  updateDates(null, 'no');
}

function updateDates(e, updateCal) {
  var dateArrive = new Date(getSelectedValue(prefix + 'dropArriveYear'), getSelectedValue(prefix + 'dropArriveMonth') - 1, getSelectedValue(prefix + 'dropArriveDay'));
  var oneday = 1000 * 60 * 60 * 24; // one day in milliseconds
  var dateLeave = new Date();

  var code = '';
  if ($(prefix + 'txtCode')) code = $(prefix + 'txtCode').value;

  if (getSelectedValue(prefix + 'dropArriveYear') > 0 && getSelectedValue(prefix + 'dropArriveMonth') > 0 && getSelectedValue(prefix + 'dropArriveDay') > 0) {

    if (e) {
      offset = 0;
      var target = getTarget(e);
      if (target.id.indexOf('dropArrive') > 0) {
        if (changedLeave == false && nights > 0 && nights < 100) {
          dateLeave = new Date(dateArrive);
          dateLeave.setDate(dateLeave.getDate() + nights);
          setSelectedValue(prefix + 'dropLeaveYear', dateLeave.getFullYear());
          setSelectedValue(prefix + 'dropLeaveMonth', dateLeave.getMonth() + 1);
          setSelectedValue(prefix + 'dropLeaveDay', dateLeave.getDate());
        }
      } else if (target.id.indexOf('dropLeave') > 0) {
        dateLeave = new Date(getSelectedValue(prefix + 'dropLeaveYear'), getSelectedValue(prefix + 'dropLeaveMonth') - 1, getSelectedValue(prefix + 'dropLeaveDay'));
        changedLeave = true;
      }
      // if ($("mapplaceholder")) ClearAndUpdateMarkers();		
    }
    else {
      dateLeave = new Date(getSelectedValue(prefix + 'dropLeaveYear'), getSelectedValue(prefix + 'dropLeaveMonth') - 1, getSelectedValue(prefix + 'dropLeaveDay'));
    }

    nights = Math.round((dateLeave - dateArrive + 1) / oneday); // +1 is to avoid dividing by zero

    if (nights > 0) {
      if (nights > 1) {
        $('nights').innerHTML = nights + ' nights';
      } else {
        $('nights').innerHTML = nights + ' night';
      }
    } else {
      $('nights').innerHTML = '';
    }

    if ($(prefix + 'hidVendorId') && $('calendar')) {
      new ajax('/ajax/calendar.aspx?&vendorId=' + $(prefix + 'hidVendorId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
    }

    if ($(prefix + 'hidGroupId') && $('calendar')) {
      new ajax('/ajax/group.aspx?&groupId=' + $(prefix + 'hidGroupId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
    }

    if ($('arriveCalPop') && updateCal != 'no') {
      if (dateArrive.getFullYear() > 2001) {
        YAHOO.hb.calendar.cal1.select(dateArrive);
        YAHOO.hb.calendar.cal1.cfg.setProperty("pagedate", (dateArrive.getMonth() + 1) + "/" + dateArrive.getFullYear());
        YAHOO.hb.calendar.cal1.render();
      }
      if (dateLeave.getFullYear() > 2001) {
        YAHOO.hb.calendar.cal2.select(dateLeave);
        YAHOO.hb.calendar.cal2.cfg.setProperty("pagedate", (dateLeave.getMonth() + 1) + "/" + dateLeave.getFullYear());
        YAHOO.hb.calendar.cal2.render();
      }
    }
  }

  if (e) disableNextButton();
}

function disableNextButton() {
  if ($(prefix + 'btnNext')) $(prefix + 'btnNext').disabled = true;
  if ($('message')) $('message').style.visibility = 'visible';
}

function locationClicked(e) {
  if ($(prefix + 'txtLocation').value == 'location or postcode') {
    $(prefix + 'txtLocation').value = '';
    $(prefix + 'txtLocation').className = '';
  }
}

function stayClicked(e) {
  if ($(prefix + 'chkStay')) {
    if ($(prefix + 'chkStay').checked) {
      $('leavingrow').style.visibility = 'visible';
      $('nightsrow').style.visibility = 'visible';
      // $('arrivingcell').innerHTML = 'Arriving:';
    } else {
      $('leavingrow').style.visibility = 'hidden';
      $('nightsrow').style.visibility = 'hidden';
      // $('arrivingcell').innerHTML = 'Date:';
    }
  }
}

function setDate(year, month, day) {
  var dateArrive = new Date(year, month - 1, day);
  setSelectedValue(prefix + 'dropArriveYear', year);
  setSelectedValue(prefix + 'dropArriveMonth', month);
  setSelectedValue(prefix + 'dropArriveDay', day);

  if (nights <= 0) nights = 1;
  offset = 0;

  dateLeave = new Date(dateArrive);
  dateLeave.setDate(dateLeave.getDate() + nights);
  setSelectedValue(prefix + 'dropLeaveYear', dateLeave.getFullYear());
  setSelectedValue(prefix + 'dropLeaveMonth', dateLeave.getMonth() + 1);
  setSelectedValue(prefix + 'dropLeaveDay', dateLeave.getDate());

  var code = '';
  if ($(prefix + 'txtCode')) code = $(prefix + 'txtCode').value;
  
  if ($(prefix + 'hidVendorId') && $('calendar')) {
    new ajax('/ajax/calendar.aspx?&vendorId=' + $(prefix + 'hidVendorId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
  }
  else if ($(prefix + 'hidGroupId') && $('calendar')) {
    new ajax('/ajax/group.aspx?&groupId=' + $(prefix + 'hidGroupId').value + '&dateArrive=' + standardDate(dateArrive) + '&dateLeave=' + standardDate(dateLeave) + '&code=' + code + '&offset=' + offset + '&allowselect=true', { update: 'calendar' });
  }

  disableNextButton();
}


function initPopup(target) {
  var as, popfun;
  as = target.getElementsByTagName('a');
  for (var i = 0; i < as.length; i++) {
    if (as[i].target && as[i].target != '_blank') {

      popfun = function() {
        var width = 700;
        var height = 500;
        var offset = 0;
        var target = this.target;

        if (this.target == 'room') { width = 500; height = 300; }
        if (this.target == 'vendor') { width = 700; height = 500; }
        if (this.target == 'photo') { width = 514; height = 420; offset = 40; }

        var left = 200 + offset;
        var top = 140 + offset;
        var windowAttributes = 'width=' + width + ',height=' + height + ',left=' + left + ',top=' + top + ',scrollbars=yes,location=no,toolbar=no,status=yes,resizable=yes';

        var theWindow = window.open(this.href, target, windowAttributes);
        theWindow.focus();
        return false;
      }
      as[i].onclick = popfun;
    }
  }
}

function showBusy(id) {
  $(id).style.display = 'inline';
}

function bookmark() {
  if (navigator.appName == "Microsoft Internet Explorer") {
    var url = window.location;
    var who = "Historic Britain";
    window.external.AddFavorite(url, who);
  } else {
    alert('Please press Ctrl+D to bookmark this page.');
  }
}

function vendorBook(vendorId, type) {
  if (type == 'Stay') {
    window.opener.location = '/book/rooms.aspx?v=' + vendorId;
  } else {
    window.opener.location = '/book/tickets.aspx?v=' + vendorId;
  }
  window.close();
}

function jumpWeeks(num) {
  offset += num;
  updateDates();
}

function goClick() {
  if (nights <= 0 && $(prefix + 'chkStay').checked) {
    $('nights').innerHTML = '<b>Please check your dates.</b>';
    return false;
  } else {
    return true;
  }
}


// Let's go

var prefix = '';
var offset = 0;
var changedLeave = false;
var nights = 1;
addEvent(window, 'load', initHelpers);



// Utility functions - mostly pinched from elsewhere // 

var Class = {
  create: function() {
    return function() {
      this.initialize.apply(this, arguments);
    }
  }
}

Object.extend = function(destination, source) {
  for (property in source) {
    destination[property] = source[property];
  }
  return destination;
}

Function.prototype.bind = function(object) {
  var __method = this;
  return function() {
    return __method.apply(object, arguments);
  }
}


function addEvent(elm, evType, fn, useCapture) {
  if (elm.addEventListener) {
    elm.addEventListener(evType, fn, useCapture);
    return true;
  } else if (elm.attachEvent) {
    var r = elm.attachEvent('on' + evType, fn);
    return r;
  }
}

function getTarget(e) {
  var targ;
  if (!e) var e = window.event;
  if (e.target) targ = e.target;
  else if (e.srcElement) targ = e.srcElement;
  if (targ.nodeType == 3) // defeat Safari bug
    targ = targ.parentNode;
  return targ;
}

function $(id) {
  return document.getElementById(id);
}

function getSelectedValue(id) {
  var dropdown = $(id);
  if (dropdown.options.length > 0) {
    return dropdown.options[dropdown.selectedIndex].value;
  } else {
    return null;
  }
}

function setSelectedValue(id, value) {
  var dropdown = $(id);
  if (dropdown.options.length > 0) {
    for (var i = 0; i < dropdown.options.length; i++) {
      if (dropdown.options[i].value == value) {
        dropdown.selectedIndex = i;
        break;
      }
    }
  }
}

function standardDate(d) {
  var theMonth = d.getMonth() + 1;
  return (d.getFullYear() + '-' + theMonth + '-' + d.getDate());
}

document.getElementsByClassName = function(className) {
  var children = document.getElementsByTagName('*') || document.all;
  var elements = new Array();

  for (var i = 0; i < children.length; i++) {
    var child = children[i];
    var classNames = child.className.split(' ');
    for (var j = 0; j < classNames.length; j++) {
      if (classNames[j] == className) {
        elements.push(child);
        break;
      }
    }
  }
  return elements;
}

if (!Array.indexOf) {
  Array.prototype.indexOf = function(obj) {
    for (var i = 0; i < this.length; i++) {
      if (this[i] == obj) {
        return i;
      }
    }
    return -1;
  }
}


//-------------------------

ajax = Class.create();
ajax.prototype = {
  initialize: function(url, options) {
    this.transport = this.getTransport();
    this.postBody = options.postBody || '';
    this.method = options.method || 'post';
    this.onComplete = options.onComplete || null;
    this.update = $(options.update) || null;
    this.request(url);
  },

  request: function(url) {
    this.transport.open(this.method, url, true);
    this.transport.onreadystatechange = this.onStateChange.bind(this);
    if (this.method == 'post') {
      this.transport.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');
      if (this.transport.overrideMimeType) this.transport.setRequestHeader('Connection', 'close');
    }
    this.transport.send(this.postBody);
  },

  onStateChange: function() {
    if (this.transport.readyState == 4 && this.transport.status == 200) {
      if (this.onComplete)
        setTimeout(function() { this.onComplete(this.transport); } .bind(this), 10);
      if (this.update)
        setTimeout(function() {
          var response = this.transport.responseText;
          // Remove form tag from response or IE throws a wobbly
          response = response.replace(/<\/?form[^>]*?>/ig, '')
          // Remove viewstate tags to be kind to .Net
          response = response.replace(/<input type="hidden" name="__[^>]*?>/ig, '')
          // Update the target element
          this.update.innerHTML = response;
        } .bind(this), 10);
      this.transport.onreadystatechange = function() { };
    }
  },

  getTransport: function() {
    if (window.ActiveXObject) return new ActiveXObject('Microsoft.XMLHTTP');
    else if (window.XMLHttpRequest) return new XMLHttpRequest();
    else return false;
  }
};