var GREENWATT = {

    checkSubmitForm: function (fields) {
        
        var validated = true;
        var message = 'Please, fill in following fields:\n';

        for (var i = 0; i < fields.length; i++) {
            var field = document.getElementById(fields[i][0]);
            if (field.value == '') {
                message += fields[i][1] + '\n';
                validated = false;
            }
        }
        
        if (validated) {
            document.getElementById('contact-form').submit();
        } else {
            alert(message);
        }
    }
}