WordPress MU

Hello,

I'm trying to use wordpress mu and normal wordpress on the same domain.

Normal wordpress is in /dir directory and wordpress MU is in the root /

I'm trying to use subdomains but I can live with only the subdirectories.

The problem is located in the htaccess I'm using. It's located in / and it contains:

Redirect 301 /index.html http://www.domain.tld/dir/

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.domain\.tld$
RewriteRule ^(.*) http://www.domain.tld/$1 [R=301,L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^dir/ /dir/index.php [L]
</IfModule>

# END WordPress

How I can have:

http://www.domain.tld redirects to http://www.domain.tld/dir
domain.tld redirects to http://www.domain.tld

and use

subdomains blog.domain.tld or subdir: http://www.domain.tld/blog for wordpress mu?

Thanks in advance :)

Too many redirects. I'd install WPMU in the /blog/ folder if that's what I wanted.