<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /~$USERNAME/sucssite
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_URI} !^/index\.php.*
RewriteRule ^(.*)$ index.php/$1 [QSA,L]
</IfModule>