TR even/odd selector question

New to jQuery so hopefully this isn't too stupid of a question.

I have a html page with nested tables (horrible I know, but none the less what has to be done).

Example:

<caption>Title</caption>

<tr>

<td>

<tr>

<td>Build</td><td>32bit</td><td>64bit</td><td>Date</td>

</tr>

</table>

</td>

</tr>

I am using this jQuery:

$('.parent_table').find('tr:odd').addClass('alt');

However, the alt class is not being added to the parent tr tags...When I just do this:

$('.parent_table').find('tr').addClass('alt');

It successfully adds the alt class to all the parent_table tr tags...Why would that work, but the odd selector does not?

Thanks in advance.

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