Asset folder in root inaccessible

[eluser]Chromana[/eluser]
Actually, I've discovered that it is my .htaccess file which is messing with stuff. I'm using the one described here: http://ellislab.com/codeigniter/user-gui.../urls.html

Code:

RewriteEngine on
RewriteCond $1 !^(index\.php)
RewriteRule ^(.*)$ /index.php/$1 [L]

Once this is removed all asset files can be accessed. However, I'm a complete newbie with htaccess files and have no idea how to fix this.