[trikadin]

<style>
.new {
 background: red;
}

#node {
 background: yellow;
}
</style>
<table cellspacing="0" cellpadding="0">
  <tbody>
    <tr>
      <td id="node">Бла бла))</td>
    </tr>
  </tbody>
</table>
<button onclick="get_new()">Ещё</button>

<script>
function get_new() {
 var node=document.getElementById("node");
 var new_td=document.createElement("td");
 new_td.innerHTML="Новый!";
 new_td.className="new";
 node.parentNode.insertBefore(new_td, node);
}
</script>