Help with .htaccess redirect of directory to another domain

I was hoping one of the .htaccess mod_rewrite gurus can provide me with some code/guidance. I am starting to leverage a Content Delivery Network (CDN), and would like any requests made to my www.domain.com/images folder to be remapped to cdn.domain.com/images. Is there a quick/easy way that I can add this rule?

I'd ideally want to do this to several of my images directories. What is the best way to do this? From the root/.htaccess? Or from an .htaccess file placed within the affected directory itself?

I would place a .htaccess in each effected directory personally but then it will depend on how many your talking about, if there is say more than 4 folders then its better to delete the folders and use the root .htaccess

If you are placing one in each folder simply this will work.

RewriteEngine On
RewriteRule (.*) http://cdn.domain.com/images/$1 [L,R=301]

If you are doing it from root it is almost identical but it would be

I would place a .htaccess in each effected directory personally but then it will depend on how many your talking about, if there is say more than 4 folders then its better to delete the folders and use the root .htaccess

If you are placing one in each folder simply this will work.

RewriteEngine On
RewriteRule ^images/(.*) http://cdn.domain.com/images/$1 [L,R=301]
RewriteRule ^img/(.*) http://cdn.domain.com/img/$1[L,R=301]
RewriteRule ^graph/(.*) http://cdn.domain.com/charts/$1[L,R=301]

As an example, if you are adding it to the vBSEO standard .htaccess though you can omit the RewriteEngine On and just make sure the rules go above the vBSEO rules.

Ceri