hello ... I have a non-JS question, but nevertheless I figure I'll ask ...

I have a server:
-- root_directory
---- a_domain.com // a sub directory with a domain name

my server is set up ( via my webhost admin control panel ) to direct:
- a_domain.com --> root_directory/a_domain.com
- a_domain.eu --> root_directory/a_domain.com

every thing works fine, but...

now I want any www.a_domain.eu requests to re-direct to www.a_domain.com.

I have spent about an hour trying various htaccess methods but I have not been successful.

any thoughts?