function isNumberKey(evt) {
    var charCode = (evt.which) ? evt.which : event.keyCode
    if (charCode > 31 && (charCode < 48 || charCode > 57))
        return false;

    return true;
}
function checkKey(b1, e) {
    if (e.keyCode == 13) {
        document.getElementById(b1).click();
        return false;
    }
}
function valid_field(TypeId, cdate) {

    if (TypeId == "57") {
        if (emptyField(document.getElementById("Apartment_for_rent1_availableFromDate"))) {
            alert("Please enter Arrival Date");
            return false;
        }

        if (isDate(document.getElementById("Apartment_for_rent1_availableFromDate"), 'dd/mm/yyyy')) {
            document.getElementById("Apartment_for_rent1_txtArrivalDate").select();
            document.getElementById("Apartment_for_rent1_txtArrivalDate").focus();
            return false;
        }

        var seldate = document.getElementById("Apartment_for_rent1_availableFromDate").value;
        var date = new Array(3);
        date = seldate.split("/");
        seldate = date[1] + "/" + date[0] + "/" + date[2];
        if (compareDate(cdate, seldate) == false) {
            alert('Please enter greater date than the current date');
            document.getElementById("Apartment_for_rent1_availableFromDate").focus();
            document.getElementById("Apartment_for_rent1_availableFromDate").select();
            return false;
        }

        if (emptyField(document.getElementById("Apartment_for_rent1_availableToDate"))) {
            alert('Please enter No. of Nights');
            return false;
        }
        else {
            if (!isInt(document.getElementById("Apartment_for_rent1_availableToDate").value)) {
                alert('Please enter integer value as a night');
                document.getElementById("Apartment_for_rent1_availableToDate").select();
                document.getElementById("Apartment_for_rent1_availableToDate").focus();
                return false;
            }
        }
    }
}