Check if at root domain

[eluser]Dauntless[/eluser]
My current one is this:

Code:

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [QSA,L]
</IfModule>

(It should be a standard .htaccess script to hide the index.php)


And I would still need to override base_url: I anchor() etc and those are based on base_url. I HAVE to add the subdomain to the baseurl, otherwise every link would go to the splash screen. It this possible ?