How to add nofollow in a script

Please tell me how can I add nofollow to a script like this :

<div style='float:right; margin-left:10px;'>
<script type='text/javascript'>
digg_url=&quot;<data: post.url/>&quot;;
</script>
<script src='http://digg.com/tools/diggthis.js' type='text/javascript'/>
</div>
<p><data: post.body/></p>

 

you have to option. first is, you can add Re="nofollow" in url or link. second is, you can use robot.txt file.

 

I am using this script in blogspot, so robots.txt will not added there probably , please explain the first option in detail.

 

The best option is Doing manually No follow....