<IfModule mod_rewrite.c>
    RewriteEngine On
    RewriteRule ^img/thumb/(.*)$ thumb.php?url=$1 [QSA,L]
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]
</IfModule>

AddType application/x-javascript .js
AddType text/css .css