var days = [];
days[0] = '';
days[1] = '1';
days[2] = '2';
days[3] = '3';
days[4] = '4';
days[5] = '5';
days[6] = '6';
days[7] = '7';
days[8] = '8';
days[9] = '9';
days[10] = '10';
days[11] = '11';
days[12] = '12';
days[13] = '13';
days[14] = '14';
days[15] = '15';
days[16] = '16';
days[17] = '17';
days[18] = '18';
days[19] = '19';
days[20] = '20';
days[21] = '21';
days[22] = '22';
days[23] = '23';
days[24] = '24';
days[25] = '25';
days[26] = '26';
days[27] = '27';
days[28] = '28';
days[29] = '29';
days[30] = '30';
days[31] = '31';


function checkleapyear(datea) {
    datea = parseInt(datea);
    if (datea % 4 == 0) {
        if (datea % 100 != 0) {
            return true;
        }
        else {
            if (datea % 400 == 0)
                return true;
            else
                return false;
        }
    }
    return false;
}

function addOption(selectbox, text, value) {
    var optn = document.createElement("OPTION");
    optn.text = text;
    optn.value = value;
    selectbox.options.add(optn);
}