var Maximum = 10;
function setOptions(chosen){
    frm = document.flightSearch;
    var selbox = frm.NUM_OF_CHD;
    selbox.options.length = 0;
    var selbox2 = frm.NUM_OF_INFS;
    selbox2.options.length = 0;
    var box1 = frm.NUM_OF_ADTS.options[frm.NUM_OF_ADTS.selectedIndex].value;
    for (q = 0; q <= box1; q++) {
        selbox2.options[selbox2.options.length] = new Option(q, q);
    }
    for (i = 0; i < Maximum; i++) {
        if (chosen == i) {
            selbox.options[selbox.options.length] = new Option(0, 0);
            for (z = 1; z < (Maximum - i); z++) {
                selbox.options[selbox.options.length] = new Option(z, z);
            }
        }
    }
}

var monthDays = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
var months = new Array(new month(0, "Jan"), new month(1, "Feb"), new month(2, "Mär"), new month(3, "Apr"), new month(4, "Mai"), new month(5, "Jun"), new month(6, "Jul"), new month(7, "Aug"), new month(8, "Sep"), new month(9, "Okt"), new month(10, "Nov"), new month(11, "Dez"));

function month(i, name){
    rightnow = new Date();
    var thisyear = rightnow.getFullYear();
    var nextyear = thisyear + 1;
    var a = "<option value=\"";
    (i < rightnow.getMonth()) ? a += nextyear : a += thisyear;
    (i < 9) ? a += "0" + (i + 1) : a += (i + 1);
    a += "\">" + name + " ";
    (i < rightnow.getMonth()) ? a += (nextyear - 2000) : a += (thisyear - 2000);
    a += "</option>\n";
    this.option = a;
}

function validReturnDate(formName, elementArray){
    firstDay = eval('document.' + formName + '.' + elementArray[0] + ".options[" + 'document.' + formName + '.' + elementArray[0] + '.selectedIndex].value');
    firstMonth = eval('document.' + formName + '.' + elementArray[1] + ".options[" + 'document.' + formName + '.' + elementArray[1] + '.selectedIndex].value');
    firstYear = firstMonth.substr(0, 4);
    secondDay = eval('document.' + formName + '.' + elementArray[2] + ".options[" + 'document.' + formName + '.' + elementArray[2] + '.selectedIndex].value');
    secondMonth = eval('document.' + formName + '.' + elementArray[3] + ".options[" + 'document.' + formName + '.' + elementArray[3] + '.selectedIndex].value');
    secondYear = secondMonth.substr(0, 4);
    if ((validMonthDay(firstDay, firstMonth, firstYear)) && (validMonthDay(secondDay, secondMonth, secondYear))) {
        outboundDate = createDate(firstDay, firstMonth);
        returnDate = createDate(secondDay, secondMonth);
        return ((outboundDate.valueOf() <= returnDate.valueOf()) && (outboundDate.valueOf() > rightnow.valueOf())) ? true : false;
    }
    else {
        return false;
    }
}

function isLeapYear(year){
    return (((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0));
}

function validMonthDay(dayVal, monthVal, yearVal){
    var error = 0;
    if ((monthVal.substr(4, 2) == 4) || (monthVal.substr(4, 2) == 6) || (monthVal.substr(4, 2) == 9) || (monthVal.substr(4, 2) == 11)) {
        if (dayVal > 30) 
            error = 1;
    }
    else 
        if (monthVal.substr(4, 2) == 2) {
            if (isLeapYear(yearVal)) {
                if (dayVal > 29) 
                    error = 1;
            }
            else {
                if (dayVal > 28) 
                    error = 1;
            }
        }
        else {
            if (dayVal > 31) 
                error = 1;
        }
    return (error == 1) ? false : true;
}

function createDate(day, monthYear){
    dayVal = day;
    monthYearVal = monthYear;
    x = dayVal.substr(0, 1);
    (x == "0") ? day = parseInt(dayVal.substr(1, 1)) : day = parseInt(dayVal.substr(0, 2));
    
    y = monthYearVal.substr(4, 1);
    (y == "0") ? month = parseInt(monthYearVal.substr(5, 1)) : month = parseInt(monthYearVal.substr(4, 2));
    
    year = parseInt(monthYearVal.substr(0, 4));
    if (year < 1900) 
        year = year + 1900;
    newDate = new Date(year, month - 1, day);
    return newDate;
}

var monthLengths = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

function isLeapYear(year){
    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}

var rightnow = new Date();

function isNull(val){
    return (val == null);
}

function changeDate(objMonth, objDate, adoptMonth, adoptDate, difference){
    maxDays = monthLengths[(rightnow.getMonth() + objMonth.selectedIndex) % 12];
    if ((objMonth.selectedIndex == 1) && (isLeapYear(objMonth.value.substring(0, 4)))) 
        maxDays = "29";
    
    var oldSelect = objDate.selectedIndex;
    if (oldSelect > maxDays - 1) 
        oldSelect = maxDays - 1;
    
    objDate.length = 0;
    for (d = 0; d < maxDays; d++) {
        objDate[d] = new Option((d + 1), (((d + 1) < 10) ? "0" + (d + 1) : d + 1));
    }
    
    objDate.selectedIndex = oldSelect;
    
    if (difference > 0 || difference == undefined) {
        var priMonth = objMonth;
        var priDate = objDate;
        var secMonth = adoptMonth;
        var secDate = adoptDate;
    }
    else {
        var secMonth = objMonth;
        var secDate = objDate;
        var priMonth = adoptMonth;
        var priDate = adoptDate;
    }
    
    if (secMonth != undefined) {
        if (priMonth.value > secMonth.value) {
            secMonth.selectedIndex = priMonth.selectedIndex;
        }
        if (priMonth.value == secMonth.value && priDate.value > secDate.value) {
            secDate.selectedIndex = priDate.selectedIndex;
        }
    }
    
}


// flights /////////////////////////////////////////////////////////////////////////////////////////
function flightSearchSubmit(buttonValue){


    if (submitform == false) 
        return false;
    
    
    //		document.flightSearch.whereTo.value = buttonValue;
    //		document.flightSearch.BE_QUICK_SEARCH_FLAG.value = true;
    
    var datesArray = new Array('departureDay', 'departureMonth', 'returnDay', 'returnMonth');
    var formName = 'flightSearch';
    firstDay = eval('document.' + formName + '.' + datesArray[0] + ".options[" + 'document.' + formName + '.' + datesArray[0] + '.selectedIndex].value');
    firstMonth = eval('document.' + formName + '.' + datesArray[1] + ".options[" + 'document.' + formName + '.' + datesArray[1] + '.selectedIndex].value');
    firstYear = firstMonth.substr(0, 4);
    secondDay = eval('document.' + formName + '.' + datesArray[2] + ".options[" + 'document.' + formName + '.' + datesArray[2] + '.selectedIndex].value');
    secondMonth = eval('document.' + formName + '.' + datesArray[3] + ".options[" + 'document.' + formName + '.' + datesArray[3] + '.selectedIndex].value');
    secondYear = secondMonth.substr(0, 4);
    
    if ((document.flightSearch.departureAirport.value.length > 0 && document.flightSearch.arrivalAirport.value.length > 0)) {
        if (!validMonthDay(firstDay, firstMonth, firstYear)) {
        
            alert("Bitte geben Sie ein gültiges Abflugdatum ein");
            return false;
        }
        else {
            if (!validMonthDay(secondDay, secondMonth, secondYear)) {
                alert("Bitte geben Sie ein gültiges Abflug/Rückflugdatum ein");
                return false;
            }
            else {
                if (validReturnDate(formName, datesArray)) {
                    return true;
                }
                else {
                    alert("Bitte geben Sie ein gültiges Abflug/Rückflugdatum ein");
                    return false;
                }
            }
        }
    }
    else {
        alert("Bitte geben Sie einen Hinflug/Rückflugort ein");
        return false;
    }
}

// set week day
var days = ["So", "Mo", "Di", "Mi", "Do", "Fr", "Sa", ];
var mDays = new Array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
function calcDay(frm, nm, nm2, day){
    dateVal = document.forms[frm].elements[nm].options[document.forms[frm].elements[nm].selectedIndex].value;
    monthVal = document.forms[frm].elements[nm2].options[document.forms[frm].elements[nm2].selectedIndex].value;
    var isLeapYear = (((monthVal.substr(0, 4) % 4 == 0) && (monthVal.substr(0, 4) % 100 != 0)) || (monthVal.substr(0, 4) % 400 == 0));
    mDays[1] = (isLeapYear) ? 29 : 28;
    if (dateVal > mDays[monthVal.substr(4, 2) - 1]) {
        setDDValue(document.forms[frm].elements[nm], mDays[monthVal.substr(4, 2) - 1]);
        dateVal = document.forms[frm].elements[nm].options[document.forms[frm].elements[nm].selectedIndex].value;
    }
    newDate = new Date(Date.UTC(monthVal.substr(0, 4), parseInt(monthVal.substr(4, 2) - 1), dateVal));
    document.forms[frm].elements[day].value = days[newDate.getDay()];
}

function initFlights(){
    tomorrow = new Date(rightnow.getTime() + (86400000));
    document.flightSearch.departureDay.selectedIndex = tomorrow.getDate() - 1;
    then = new Date(tomorrow.getTime() + (604800000))
    document.flightSearch.returnDay.selectedIndex = then.getDate() - 1;
    document.flightSearch.returnMonth.selectedIndex = (then.getMonth() - tomorrow.getMonth()) % 12;
    var oldDepartIndex = document.flightSearch.departureDay.selectedIndex;
    document.flightSearch.departureDay.selectedIndex = oldDepartIndex;
    var oldReturnIndex = document.flightSearch.returnDay.selectedIndex;
    document.flightSearch.returnDay.selectedIndex = oldReturnIndex;
    if (tomorrow.getDate() - 1 == 0) {
        document.flightSearch.departureMonth.selectedIndex = (then.getMonth() + 1 - tomorrow.getMonth())
        document.flightSearch.returnMonth.selectedIndex = (then.getMonth() + 1 - tomorrow.getMonth())
    }
}


function flightPrepSubmit(){
    if (document.getElementById('departureAirport_hidden').value == '' && 
		document.getElementById('departureAirport').value.length == 3) 
        document.getElementById('departureAirport_hidden').value 	= document.getElementById('departureAirport').value;
    if (document.getElementById('arrivalAirport_hidden').value == '' && 
		document.getElementById('arrivalAirport').value.length == 3) 
        document.getElementById('arrivalAirport_hidden').value 		= document.getElementById('arrivalAirport').value;
    
	submitform = true;    
}

function dateChangeTrigger(){
}

// set preferred Airlines
function fillSelect(field, codeArray, nameArray, selectedValue){
    var selectedIndex = -1;
    for (var i = 0; i < codeArray.length; i++) {
        if (selectedValue == codeArray[i]) 
            selectedIndex = field.length;
        field[field.length] = new Option(nameArray[i], codeArray[i]);
    }
    if (selectedIndex != -1) 
        field.selectedIndex = selectedIndex;
}

var airlines = new Array("American Airlines", "Air Berlin", "Air Canada", "Air France", "Alitalia", "British Airways", "China Airlines", "Continental Airlines", "Cathay Pacific", "Condor", "Delta Air Lines", "Emirates", "Etihad Airways", "Finnair", "Icelandair", "Gulf Air", "Iberia", "Spanair", "KLM", "Lufthansa", "LOT", "LTU", "SWISS", "All Nippon Airways", "Czech Airlines", "Austrian Airlines", "South African Airways", "SAS", "Brussels Airlines", "Air Transat", "Thai Airways", "Turkish Airlines", "TAP", "United Airlines", "US Airways", "Virgin Atlantic");
var airlineCodes = new Array("AA", "AB", "AC", "AF", "AZ", "BA", "CI", "CO", "CX", "DE", "DL", "EK", "EY", "AY", "FI", "GF", "IB", "JK", "KL", "LH", "LO", "LT", "LX", "NH", "OK", "OS", "SA", "SK", "SN", "TA", "TG", "TK", "TP", "UA", "US", "VS");