If you use GoDaddy as your domain registrar; here are some steps that allow you to do a 301 redirect of your non-www to www domain or vice-versa using your GoDaddy DNS management console: http://eltonvinson.com/blog/301-redirects-wild-apricot
Other registrars allow you to do similar tasks also. Hope this helps!
Elton
If you use GoDaddy as your domain registrar; here are some steps that allow you to do a 301 redirect of your non-www to www domain or vice-versa using your GoDaddy DNS management console: http://eltonvinson.com/blog/301-redirects-wild-apricot
Other registrars allow you to do similar tasks also. Hope this helps!