[jQuery] Insert class into td in a nested div.

[jQuery] Insert class into td in a nested div.


I have a series of td's that reside within a nested div. the <td> has
no class value and I would like to inject a css class value.
<div class=x>
<div class=y>
<div class=z>
<table><tr>
<td>x</td> want a class in these tds
how can I do this with jquery?