Moving site from directory to sub domain

[deadhippo]

Hi,
I am about to move a site from a directory to subdomain and I want to redirect a few pages and was wondering what the best way of doing that was. I'm not took worried about losing ranking as it is not the most popular site in the world but I don't want to break people's links to my homepage.

eg. www.mysite.com/directory --> directory.mysite.com

I see lots of redirect codes out there and I guess that is the problem . I can't figure out which would be the right one for me.

What do you think?

[Jon-WebsiteCM]

Mod rewrite something along the lines of:

RewriteEngine On
RewriteCond %{REQUEST_URI} ^/directory/(.*)$
RewriteRule ^(.*)$ http://directory.example.com/$1 [L,R=301]