installation of a non-domainroot directory

[shaitan]

Hi! I install simple cms in midomain.net/simple/. i look my site in xttp://midomain.net/simple/. How can I use my website at domain xttp://midomain.net/? This time xttp://midomain.net/ contains blank page.
My htaccess:
'AddDefaultCharset UTF-8
Options -Indexes

# blocks direct access to the XML files - they hold all the data!
<Files ~ "\.xml$">
Order allow,deny
Deny from all
Satisfy All
</Files>
<Files sitemap.xml>
Order allow,deny
Allow from all
Satisfy All
</Files>

RewriteEngine on

# Usually it RewriteBase is just '/', but
# replace it with your subdirectory path
RewriteBase /simpleyoh/

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule /?([A-Za-z0-9_-]+)/?$ index.php?id=$1 [QSA,L]'