NoIndex all the single posts

Hi everybody,

I would like to add a NoIndex in all of my Single Posts only, not in my category pages and posts listing pages.

The reason is I use a plugin to agregate a RSS feed and title post link to the original Web site http://www.getlawyerusa.com/jobs/ and I dont know how but this morning a saw post page on google: http://www.getlawyerusa.com/2010/01/30/litigation-attorney-atlanta/ and I dont want Google see this like duplicate contents.

I saw this stuff on a site for disable only specific post:

<?php if ($post->ID == 17) {
    echo '<meta name="robots" content="noindex">';
}

I need the same thing but for all my single post.

Thanks