To redirect the Non-WWW URL for your site to the WWW version [or vice versa] on an Apache Server, using Apache Mod_rewrite, place this code in your .htaccess file:
[CODE]
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www\.yourdomain\.com [NC]
RewriteRule ^(.*) http://www.yourdomain.com/$1 [L,R=301]
[/CODE]