[Plugin: NextGEN Gallery] Missing CSS files via wp_head(); ?

Hi,

I integrated WP in a PHP website. Plugins like “FancyBox for WordPress” are working right — the nextgen plugin, too — but the CSS files are missing.

Do I have to put some more code except of “wp_head()” to output the css links esp. for nextgen?

Thanks, carlos

http://wordpress.org/extend/plugins/nextgen-gallery/