Simple redirect problem - apache

I want to redirect
http://xxx.abc.com/any/thing/here
to
http://kkk.xxx.abc.com/any/thing/here

if the user is using an iphone or ipod
Here is my code

RewriteCond %{HTTP_USER_AGENT} (ipod|iphone) [NC]
RewriteRule ^(.*) http://kkk.xxx.abc.com/$1? [R=301,L]


Gives me the following error

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

Please help

Thanks guys, I fixed it myself :)

What was the solution?