function cleanErrorMessages(formId) {
    var ul = document.getElementById('fielderror_' + formId);
    if(ul) {
        ul.innerHTML = '';
    }
    return ul;
}
function addErrorMessages(ul, errorText) {
    try {
        var error = document.createTextNode(errorText);
        
        var span = document.createElement('span');
        span.appendChild(error);
                    
        var li = document.createElement('li');
        li.appendChild(span);

        ul.appendChild(li);
    } catch (e) {
        alert(e);
    }
}