[Dimme]

Allt du behöver är detta som fixar både "/" och alla undersidor:

.htaccess

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

index.php

<?php
header( "HTTP/1.1 301 Moved Permanently" );
header( "Status: 301 Moved Permanently" );
header( "Location: http://www.ny-url.se".$_SERVER['REQUEST_URI'] );
exit(0);
?>