I need URL redirect to www - Anybody HELP me?

i am trying to redirect my without www URL with www URL i mean to say

when anybody open http://mysite.com then URL automatically redirect to http://www.mysite.com

so for this i have to some editing in .htaccess file and i did this way

and after doing this editing when i open site i get msg that "The Site isn't redirecting properly" so anybody who could tell me what's the problem with...Thanks!

 

Here you go

RewriteEngine On

## Defines base
RewriteBase /

RewriteCond %{HTTP_HOST} ^site.com
RewriteRule (.*) http://www.site.com/$1 [R=301,L]

btw, would you be interested in link exchange with my site, darkmindz.com?

 

Thanks for this, i put this code in .htaccess file but it isn't still working

 

whats the error?

 

I found a blog post that describes how to do it:

http://www.dowling.me.uk/blog/adding-www-to-your-domain-with-apache/

I tested it and it seems to work