SO - 15860851

by Arun P Johny

HTML

<table>
<tr>
<td>
A
</td>
<td>
B
</td>
</tr>
<tr>
<td>
C
</td>
<td>
D
</td>
</tr>
</table>

JavaScript

$('table td:odd').each(function(i, v){
    var $this = $(this);
    var parent = $this.parent();
    $this.detach().wrap('<tr></tr>').insertAfter(parent)
})