function keepDateOrder(isArr) {
  // preserve a logically valid period
  var arr          =  document.FormAdvSearch.Arr.value;
  var dep          =  document.FormAdvSearch.Dep.value;
  var dateArr      =  tBDateNew(arr);
  var dateDep      =  tBDateNew(dep);
  if (dateArr == false || dateDep == false) { return true }
  if (isArr && (dateArr >= dateDep)){
    if (dateArr.valueOf() == tBDateSelectors["FormAdvSearchArr"].end.valueOf()){
      dateArr = tBDecrementDate(dateArr);
    }
    dateDep = tBIncrementDate(dateArr);
    tBDateSelectors["FormAdvSearchDep"].update(tBDateToDMYStr(dateDep));
    tBDateSelectors["FormAdvSearchArr"].update(tBDateToDMYStr(dateArr));
  }
  if (!isArr && (dateArr >= dateDep)){
    if (dateDep.valueOf() == tBDateSelectors["FormAdvSearchArr"].start.valueOf()){
      dateDep = tBIncrementDate(dateDep);
    }
    dateArr = tBDecrementDate(dateDep);
    tBDateSelectors["FormAdvSearchArr"].update(tBDateToDMYStr(dateArr));
    tBDateSelectors["FormAdvSearchDep"].update(tBDateToDMYStr(dateDep));
  }
  return true;
}

function hightlightAdvSearchCategory(strID, boolOn){
  var objRow = document.getElementById(strID);
  if (boolOn){
    document.getElementById(strID).className = "tbRowSelected";
  } else {
    document.getElementById(strID).className = "tbRow2";
  }
}

function redirectNeeded(){
  return location.href.indexOf("SearchResultsOnl.asp") == -1;
}

function refreshAdvancedSearchOptions(){
  var tagID = "advSearchOptions";
  if (document.getElementById(tagID).style.display != "none"){
    var xmlHttp=GetXmlHttpObject();
    if (xmlHttp == null){
        alert ("Browser does not support HTTP Request");
      return false;
    }
    document.getElementById(tagID).innerHTML = PleaseWait;
    var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
    var Arr = document.getElementById("tBDateSelectFormAdvSearchArr").value;
    var Dep = document.getElementById("tBDateSelectFormAdvSearchDep").value;
    var url="/Advs/ajaxRefreshAdvancedSearchOptions.asp";
    url += "?sid=" + Math.random();
    url += "&LocationGeoCodeID=" + LocationGeoCodeID;
    url += "&Arr=" + Arr;
    url += "&Dep=" + Dep;
    url += "&LangID=" + LangID;
    xmlHttp.onreadystatechange = function(){ 
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
        document.getElementById(tagID).innerHTML = xmlHttp.responseText;
      }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  }
}

function refreshCities(CountryID){
  var xmlHttp=GetXmlHttpObject()
  if (xmlHttp == null){
      alert ("Browser does not support HTTP Request");
    return false;
  }
  var tagID = "divLocationGeoCodeID";
  document.getElementById("LocationGeoCodeID").options.length = 1;
  document.getElementById("LocationGeoCodeID").options[0].value = 0;
  document.getElementById("LocationGeoCodeID").options[0].text = PleaseWait;
  var url="/Advs/ajaxRefreshCities.asp";
  url += "?CountryID=" + CountryID;
  url += "&LangID=" + LangID;
  url += "&sid=" + Math.random();
  xmlHttp.onreadystatechange = function(){ 
    if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete"){ 
      document.getElementById(tagID).innerHTML = xmlHttp.responseText;
      if (document.getElementById("advSearchOptions").style.display != "none"){
        swapSearchPane(true);
      }
      resetSearchSettings();
    }
  }
  xmlHttp.open("GET",url,true);
  xmlHttp.send(null);
}

function refreshClassifications(boolOn, strClassifications){
  swapImage(boolOn, "Classification");
  var tagID = "ClassificationPane";
  if (boolOn){
    var xmlHttp=GetXmlHttpObject();
    if (xmlHttp == null){
        alert ("Browser does not support HTTP Request");
      return false;
    }
    document.getElementById(tagID).innerHTML = PleaseWait;
    var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
    var url="/Advs/ajaxRefreshClassifications.asp";
    url += "?sid=" + Math.random();
    url += "&LocationGeoCodeID=" + LocationGeoCodeID;
    url += "&Classifications=" + strClassifications;
    url += "&LangID=" + LangID;  
    xmlHttp.onreadystatechange = function(){ 
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
        document.getElementById(tagID).innerHTML = xmlHttp.responseText;
        document.getElementById("aClassification").onclick = function(){
          refreshClassifications(false, ''); 
          return false; 
        };
      }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  } else {
    document.getElementById(tagID).innerHTML = "";
    document.getElementById("aClassification").onclick = function(){
      refreshClassifications(true, ''); 
      return false; 
    };
  }
}

function refreshMaxDistance(boolOn, maxDistance){
  swapImage(boolOn, "Distance");
  var tagID = "DistancePane";
  if (boolOn){
    var xmlHttp=GetXmlHttpObject();
    if (xmlHttp == null){
        alert ("Browser does not support HTTP Request");
      return false;
    }
    document.getElementById(tagID).innerHTML = PleaseWait;
    var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
    var url="/Advs/ajaxRefreshMaxDistance.asp";
    url += "?sid=" + Math.random();
    url += "&LocationGeoCodeID=" + LocationGeoCodeID;
    url += "&MaxDistance=" + maxDistance;
    url += "&LangID=" + LangID;  
    xmlHttp.onreadystatechange = function(){ 
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
        document.getElementById(tagID).innerHTML = xmlHttp.responseText;
        document.getElementById("aDistance").onclick = function(){
          refreshMaxDistance(false, ''); 
          return false; 
        };
      }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  } else {
    document.getElementById(tagID).innerHTML = "";
    document.getElementById("aDistance").onclick = function(){
      refreshMaxDistance(true, ''); 
      return false; 
    };
  }
}

function refreshFacilityGroup(boolOn, intFacilityGroupID, strFacilities){
  swapImage(boolOn, "FG" + intFacilityGroupID);
  var tagID = "FacilityGroupPane" + intFacilityGroupID;
  if (boolOn){
    var xmlHttp=GetXmlHttpObject();
    if (xmlHttp == null){
        alert ("Browser does not support HTTP Request");
      return false;
    }
    document.getElementById(tagID).innerHTML = PleaseWait;
    var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
    var Arr = document.getElementById("tBDateSelectFormAdvSearchArr").value;
    var Dep = document.getElementById("tBDateSelectFormAdvSearchDep").value;
    var OrderBy = document.getElementById("OrderBy").value;
    var url="/Advs/ajaxRefreshFacilityGroups.asp";
    url += "?sid=" + Math.random();
    url += "&LocationGeoCodeID=" + LocationGeoCodeID;
    url += "&FacilityGroupID=" + intFacilityGroupID;
    url += "&Facilities=" + strFacilities;
    url += "&LangID=" + LangID;
    xmlHttp.onreadystatechange = function(){ 
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
        document.getElementById(tagID).innerHTML = xmlHttp.responseText;
        document.getElementById("aFacilityGroup" + intFacilityGroupID).onclick = function(){
          refreshFacilityGroup(false, intFacilityGroupID, ''); 
          return false; 
        };
      }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  } else {
    document.getElementById(tagID).innerHTML = "";
    document.getElementById("aFacilityGroup" + intFacilityGroupID).onclick = function(){
      refreshFacilityGroup(true, intFacilityGroupID, ''); 
      return false; 
    };
  }
}

function refreshHotels(PageID, pOrderBy){
  if (redirectNeeded()){
    refreshPage();
    return 0;
  }
  var xmlHttp=GetXmlHttpObject();
  if (xmlHttp == null){
      alert ("Browser does not support HTTP Request");
    return false;
  }
  var tagID = "mainPane";
  document.getElementById(tagID).innerHTML = "<div style='display:table; width: 100%; margin: 0px auto; height: 200px'>" +
                                             "  <div style='display:table-cell; text-align: center; vertical-align: middle'>" + 
                                                  PleaseWait + 
                                             "    <br/><img src='/images/loading.gif' title='" + PleaseWait +"' alt='" + PleaseWait +"'/> " + 
                                             "  </div>" +
                                             "</div>";
  PageID = PageID != undefined ? PageID : 0;
  if (pOrderBy != undefined){
    var obj = document.getElementById("OrderBy");
    var maxI = obj.options.length;
    var i = 0;
    while (i < maxI && obj.options[i].value != pOrderBy){
      i++;
    }
    obj.selectedIndex = i < maxI ? i : 0;
  }
  var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
  var CountryID = document.getElementById("CountryID").value;
  var Arr = document.getElementById("tBDateSelectFormAdvSearchArr").value;
  var Dep = document.getElementById("tBDateSelectFormAdvSearchDep").value;
  //var NrOfPersons = document.getElementById("NrOfPersons").value;
  var AvailableOnly = document.getElementById("AvailableOnly").checked ? 1 : 0;
  var OrderBy = document.getElementById("OrderBy").value;
  var ShowMap = document.getElementById("ShowMap").checked ? 1 : 0;
  var MaxDistance = "";
  if (document.getElementById("MaxDistance")){
    var objMaxDistance = document.getElementById("MaxDistance");
    MaxDistance = objMaxDistance.options[objMaxDistance.selectedIndex].value;
  }
  var Buckets = "";
  var Classifications = "";
  var Districts = "";
  
  var FacilityGroup1 = "";
  var FacilityGroup2 = "";
  var FacilityGroup3 = "";
  var FacilityGroup4 = "";
  for (var i = 0; i < document.getElementsByTagName("input").length; i++){
    if  (
              document.getElementsByTagName("input")[i].type == "checkbox" 
          &&  document.getElementsByTagName("input")[i].checked
        ){
      if (document.getElementsByTagName("input")[i].name == "chkAdvBucket"){
        var intID = document.getElementsByTagName("input")[i].id.substring(12);
        Buckets += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name == "chkAdvClass"){
        var intID = document.getElementsByTagName("input")[i].id.substring(11);
        Classifications += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name == "chkAdvDistrict"){
        var intID = document.getElementsByTagName("input")[i].id.substring(14);
        Districts += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup1_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup1 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup2") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup2 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup3_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup3 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup4_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup4 += "," + intID;
      }
    }
  }
  Buckets = Buckets.substring(1);
  Classifications = Classifications.substring(1);
  Districts = Districts.substring(1);
  FacilityGroup1 = FacilityGroup1.substring(1);
  FacilityGroup2 = FacilityGroup2.substring(1);
  FacilityGroup3 = FacilityGroup3.substring(1);
  FacilityGroup4 = FacilityGroup4.substring(1);
  var url="/Advs/ajaxRefreshHotelList.asp";
  url += "?sid=" + Math.random();
  url += "&LocationGeoCodeID=" + LocationGeoCodeID;
  url += "&CountryID=" + CountryID;
  url += "&Arr=" + Arr;
  url += "&Dep=" + Dep;
  url += "&AvailableOnly=" + AvailableOnly;
  url += "&OrderBy=" + OrderBy;
  url += "&ShowMap=" + ShowMap;
  url += "&Buckets=" + Buckets;
  url += "&Classifications=" + Classifications;
  url += "&Districts=" + Districts;
  url += "&MaxDistance=" + MaxDistance;
  url += "&FacilityGroup1=" + FacilityGroup1;
  url += "&FacilityGroup2=" + FacilityGroup2;
  url += "&FacilityGroup3=" + FacilityGroup3;
  url += "&FacilityGroup4=" + FacilityGroup4;
  url += "&PageID=" + PageID;
  url += "&LangID=" + LangID;
  xmlHttp.onreadystatechange = function(){ 
    if (xmlHttp.readyState == 4 || xmlHttp.readyState == "complete"){ 
      document.getElementById(tagID).innerHTML = xmlHttp.responseText;
      if (document.getElementById("ShowMap").checked){
        hlInitMap();
      }
    }
  }
  xmlHttp.open("GET",url,true);
  xmlHttp.send(null);
}

function refreshPage(){
  if (document.getElementById("tBDateSelectFormAdvSearchArr").value == ""){
    alert(AlertNoArr);
    return false;
  }
  if (document.getElementById("tBDateSelectFormAdvSearchDep").value == ""){
    alert(AlertNoDep);
    return false;
  }
  var langTags = new Array();
  langTags[1] = "/";
  langTags[2] = "/fr/";
  langTags[3] = "/de/";
  langTags[4] = "/it/";
  langTags[5] = "/es/";
  langTags[6] = "/it/";
  langTags[7] = "/tr/";
  langTags[8] = "/hu/";
  langTags[9] = "/nl/";
  var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
  var CountryID = document.getElementById("CountryID").value;
  var Arr = document.getElementById("tBDateSelectFormAdvSearchArr").value;
  var Dep = document.getElementById("tBDateSelectFormAdvSearchDep").value;
  var AvailableOnly = document.getElementById("AvailableOnly").checked ? 1 : 0;
  var OrderBy = document.getElementById("OrderBy").value;
  var ShowMap = document.getElementById("ShowMap").checked ? 1 : 0;
  var MaxDistance = "";
  if (document.getElementById("MaxDistance")){
    var objMaxDistance = document.getElementById("MaxDistance");
    MaxDistance = objMaxDistance.options[objMaxDistance.selectedIndex].value;
  }
  var Buckets = "";
  var Classifications = "";
  var Districts = "";
  var FacilityGroup1 = "";
  var FacilityGroup2 = "";
  var FacilityGroup3 = "";
  var FacilityGroup4 = "";
  for (var i = 0; i < document.getElementsByTagName("input").length; i++){
    if  (
              document.getElementsByTagName("input")[i].type == "checkbox" 
          &&  document.getElementsByTagName("input")[i].checked
        ){
      if (document.getElementsByTagName("input")[i].name == "chkAdvBucket"){
        var intID = document.getElementsByTagName("input")[i].id.substring(12);
        Buckets += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name == "chkAdvClass"){
        var intID = document.getElementsByTagName("input")[i].id.substring(11);
        Classifications += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name == "chkAdvDistrict"){
        var intID = document.getElementsByTagName("input")[i].id.substring(14);
        Districts += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup1_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup1 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup2") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup2 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup3_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup3 += "," + intID;
      }
      if (document.getElementsByTagName("input")[i].name.indexOf("chkAdvFacilityGroup4_") != -1){
        var intID = document.getElementsByTagName("input")[i].id.substring(21);
        FacilityGroup4 += "," + intID;
      }
    }
  }
  Buckets = Buckets.substring(1);
  Classifications = Classifications.substring(1);
  Districts = Districts.substring(1);
  FacilityGroup1 = FacilityGroup1.substring(1);
  FacilityGroup2 = FacilityGroup2.substring(1);
  FacilityGroup3 = FacilityGroup3.substring(1);
  FacilityGroup4 = FacilityGroup4.substring(1);
  var url = langTags[LangID] + "SearchResultsOnl.asp";
  url += "?sid=" + Math.random();
  url += "&LocationGeoCodeID=" + LocationGeoCodeID;
  url += "&CountryID=" + CountryID;
  url += "&Arr=" + Arr;
  url += "&Dep=" + Dep;
  url += "&AvailableOnly=" + AvailableOnly;
  url += "&OrderBy=" + OrderBy;
  url += "&ShowMap=" + ShowMap;
  url += "&Buckets=" + Buckets;
  url += "&Classifications=" + Classifications;
  url += "&MaxDistance=" + MaxDistance;
  url += "&Districts=" + Districts;
  url += "&FacilityGroup1=" + FacilityGroup1;
  url += "&FacilityGroup2=" + FacilityGroup2;
  url += "&FacilityGroup3=" + FacilityGroup3;
  url += "&FacilityGroup4=" + FacilityGroup4;
  url += "&FormHotelSearchSubmit=" + "FormHotelSearchSubmit";
  window.location = url;
}

function refreshPriceBuckets(boolOn, strBuckets){
  swapImage(boolOn, "PriceCategory");
  var tagID = "PriceBucketPane";
  if (boolOn){
    var xmlHttp=GetXmlHttpObject();
    if (xmlHttp == null){
        alert ("Browser does not support HTTP Request");
      return false;
    }
    document.getElementById(tagID).innerHTML = PleaseWait;
    var LocationGeoCodeID = document.getElementById("LocationGeoCodeID").value;
    var Arr = document.getElementById("tBDateSelectFormAdvSearchArr").value;
    var Dep = document.getElementById("tBDateSelectFormAdvSearchDep").value;
    var url="/Advs/ajaxRefreshPriceBuckets.asp";
    url += "?sid=" + Math.random();
    url += "&LocationGeoCodeID=" + LocationGeoCodeID;
    url += "&Buckets=" + strBuckets;
    url += "&Arr=" + Arr;
    url += "&Dep=" + Dep;
    url += "&LangID=" + LangID;  
    xmlHttp.onreadystatechange = function(){ 
      if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
        document.getElementById(tagID).innerHTML = xmlHttp.responseText;
        document.getElementById("aPriceCategory").onclick = function(){
          refreshPriceBuckets(false, ''); 
          return false; 
        };
      }
    }
    xmlHttp.open("GET",url,true);
    xmlHttp.send(null);
  } else {
    document.getElementById(tagID).innerHTML = "";
    document.getElementById("aPriceCategory").onclick = function(){
      refreshPriceBuckets(true, ''); 
      return false; 
    };
  }
}

function resetSearchSettings(){
  refreshClassifications(false, '');
  refreshMaxDistance(false, '');
  refreshDistricts(false, '');
  refreshFacilityGroup(false, 1, '');
  refreshFacilityGroup(false, 2, '');
  refreshFacilityGroup(false, 3, '');
  refreshFacilityGroup(false, 4, '');
  refreshPriceBuckets(false, '');
  if (redirectNeeded()){
    if (document.getElementById("tBDateSelectFormAdvSearchArr").value != ""
     && document.getElementById("tBDateSelectFormAdvSearchDep").value != "")
    {
      refreshPage();
    }
  } else if (document.getElementById("mainPane")){
    document.getElementById("mainPane").innerHTML = PleaseWait;
    refreshHotels(0,document.getElementById("OrderBy").value);
  }
}

function swapImage(boolOn, strName){
  objIMG = document.getElementById("img" + strName);
  if (boolOn){
    // right >> down, show 'Search'
    if (objIMG.src.indexOf("-hi") == -1){
      objIMG.src = "/images/blue-down-arrow.gif";
    } else {
      objIMG.src = "/images/blue-down-arrow-hi.gif";
    }
  } else {
    //down >> right, hide 'Search'
    if (objIMG.src.indexOf("-hi") == -1){
      objIMG.src = "/images/blue-right-arrow.gif";
    } else {
      objIMG.src = "/images/blue-right-arrow-hi.gif";
    }
  }
}

function swapPageBarImage(intMode){
  var obj = document.getElementById("imgOrderBy");
  if (intMode == 1){ //blue to orange
    obj.src = obj.src.replace("blue", "orange");
  } else if (intMode == 2){ //orange to blue
    obj.src = obj.src.replace("orange", "blue");
  }
  return 1;
}

function highlightImage(BoolON, strName){
  objIMG = document.getElementById("img" + strName);
  if (BoolON){
    //highlight ON
    if (objIMG.src.indexOf("right") == -1){
      objIMG.src = "/images/blue-down-arrow-hi.gif";
    } else {
      objIMG.src = "/images/blue-right-arrow-hi.gif";
    }
  } else {
    //highlight OFF
    if (objIMG.src.indexOf("right") == -1){
      objIMG.src = "/images/blue-down-arrow.gif";
    } else {
      objIMG.src = "/images/blue-right-arrow.gif";
    }
  }
}

function swapSearchPane(boolOn){
  if (boolOn){
    //simpe to advanced
    document.getElementById("showAdvSearchLink").style.display  = "none";
    document.getElementById("advSearchOptions").style.display   = "block";
    document.getElementById("showSmpSearchLink").style.display  = "block";
    refreshAdvancedSearchOptions();
  } else {
    //advanced to simpe
    document.getElementById("showAdvSearchLink").style.display  = "block";
    document.getElementById("advSearchOptions").style.display   = "none";
    document.getElementById("showSmpSearchLink").style.display  = "none";
    document.getElementById("advSearchOptions").innerHTML = "";
  }
}