次のようなテーブルがあります。
<table class="schedule-table" cellspacing="1" border="0" style="width:100%;">
<tr class="DataRow" id="DataRow_1">
<td class="resource" style="display:none;">8</td>
<td class="resource">John Smith</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
</tr>
<tr class="DataRow" id="DataRow_2">
<td class="resource" style="display:none;">9</td>
<td class="resource">Huck Fin</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
</tr>
<tr class="DataRow" id="DataRow_3">
<td class="resource" style="display:none;">10</td>
<td class="resource">Tom Sawyer</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
<td class="resource">blah blah blah</td>
</tr>
</table>
#DataRow_2 を選択し、4 番目と 5 番目のセルを次のように置き換えたいと思います。
var newTd = <td class="newclass" colspan="2">Stuff for cell that should span two cells</td>
どうすればこれを達成できますか?