[SOLVED] www to non-www redirect not working?

My site used to be on wordpress.com with a non-www domain. Now, after moving to wordpress.org, I have this www in front, and I am trying to do a 301 redirect as in http://forum.bytesforall.com/showthread.php?t=1052, but it doesn't work.

This is how the .htaccess file looks like today:
--------------------
# Use PHP5 as default
AddHandler application/x-httpd-php5 .php

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress
----------------------

How is it supposed to look like after I have added the www to non-www redirect?