function showNewComment(show) {
    elementStyle('divNewComment').display = displayStyle(show);
    elementStyle('divAddComment').display = displayStyle(!show);
}

function displayStyle(show) {
    return show ? "block" : "none";
}

function elementById(elementId) {
    return document.getElementById(elementId);
}

function elementStyle(elementId) {
    return elementById(elementId).style;
}