<table><tr>
<td class="delete" new="1">1</td>
<td class="delete" new="2">2</td>
<td class="delete" new="">3</td>
<td class="delete" new="5">4</td>
<td class="delete" new="6">5</td>
</tr>
</table>
$('.delete').remove();
?削除TD
LIVE例:http://jsfiddle.net/xhvMd/
jQueryには適切なドキュメントがあります:http://api.jquery.com/attribute-equals-selector/ –