[jQuery] table tbody tr:last td

[jQuery] table tbody tr:last td


hi
I've a Problem:
I have a table like this:
<table class="sortable" id="res">
    <thead>
        <tr>
            <th>123</th>
            <th>123</th>
            <th>123</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>123</td>
            <td>123</td>
            <td>123</td>
        </tr>
    <tfoot>
        <tr>
            <th>123</th>
            <th>123</th>
            <th>123</th>
        </tr>
    </tfoot>
</table>
Now I made this script:
$(document).ready(function() {
    $("table tbody tr:last td").css("border", "none");
});
But that doesn't work. Does anybody know why?
thank you