Name: Password Protect wp-admin
Version: 1.4
Description: Requires a valid user/pass to access any non-static (css, js, images) file in this directory...
Rules: 
%generate_auth%
<FilesMatch "\.(ico|pdf|flv|jpg|jpeg|mp3|mpg|mp4|mov|wav|wmv|png|gif|swf|css|js)$">
Allow from All
</FilesMatch>
<FilesMatch "(async-upload|admin-ajax)\.php$">
<IfModule mod_security.c>
SecFilterEngine Off
</IfModule>
Allow from All
</FilesMatch>