Force WWW with htaccess

[itx]

Hello,

I am trying to force the www version of a website and I'm trying doing this with .htaccess but it simply doesn't work I don't know what Im doing wrong :S

Currently using this code in .htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^(.*)\.domain\.com$ [NC]
RewriteRule ^(.*)$ http://www.domain.com/ [R=301,L]
</IfModule>

[thebedshark]

This is what I use in my htaccess

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

[itx]

Your code works in the .htaccess, Thanks