How can you get a poem copyrighted?

Question:

How can you get a poem copyrighted?

I'd like to post my poems on various sites for public view, but of course, I wouldn't want people taking credit for them. :p
So, thanks in advanced for youur help!

Best Answer - Chosen by Asker:

Post them under a Creative Commons License.

www.creativecommons.com

Technically, anything you create is automatically subject to copyright law; meaning you don't have to register it or nothing. The license, though, gives you some level of proof that the work is yours.