You got it on one, you don't have the required [50 reputation][1] to comment on posts that are not your own. That's a very old question, you may want to [ask your own][2] but please have a go yoiurself and tell us what you tried and why it didn't work as you expected. [1]: http://serverfault.com/privileges/comment [2]: http://serverfault.com/questions/ask