не срабатывает appendChild

if (document.getElementsByClassName("message-table").length) {
    var hideLink = document.createElement("a");
    hideLink.className = "hideLink";
    hideLink.innerHTML = "Скрыть";
    hideLink.style.cssFloat = "left";
    hideLink.style.color = "#f33";
    hideLink.addEventListener("click", hideThisTopic);
    
    var topics = document.querySelectorAll('.message-table tbody tr');
    for (var i=0; i<topics.length; i++)
    {
        topics[i].getElementsByTagName("td")[0].appendChild(hideLink);
    }
}