function setFieldsVisibility(ctl,ctl2, ctl3,value) {
    document.getElementById(ctl).style.display = (value == true ? 'inline' : 'none');
    document.getElementById(ctl2).style.display = (value == true ? 'none' : 'inline');
    setToInvisible(ctl3);
}

function setToInvisible(messageLabelName) {
    var messageLabel = document.getElementById(messageLabelName);
    messageLabel.style.display = 'none';
    messageLabel.InnerHTML = '';
   
}

function PopulateDayCombo(month,day) {
    var Month   = document.getElementById(month);
    var Day = document.getElementById(day);
    var numberOfDays;

    if (Month.options[2].selected) {
        numberOfDays = 28;
    }
    else {
        if (Month.options[4].selected || Month.options[6].selected || Month.options[9].selected || Month.options[11].selected) {
            numberOfDays = 30
        }
        else {
            numberOfDays = 31;
        }
    }
    for (i = 0; i < 31; i++) {
        Day.options[i] = null;
    }
    for (var i = 0; i < numberOfDays; i++) {
         var x = String(i + 1);
         Day.options[i] = new Option(x);
    }

}