[Plugin: NextGEN Gallery] How do I style NGG Default Image Thumbnails

I always assign a ‘Use default image’ to my posts, which renders a standard thumbnail on both my news summary index.php and primary single.php post pages. Now this works fine if I use the default WP thumbnail method, but that’s not good enough for my site.

However, when I select a ‘Use default image’ from NGG it overwrites my custom class call and outputs like this for both the summary and primary post images:

class=”wp-post-image ngg-image-?”

The ? changes to the image ID number. So, a simple question, and I’m probably missing something here but..

1) How can I change the general style for “ngg-image-?” if the ID number is always changing for the CSS style? I can’t very well make 1000 identical styles for my 1000 images 🙂

2) How can I add a differnt CSS style on my single.php post pages, where NGG adopts the same CLASS= line above for both the summary thumbnail and the larger thumbnailed output on single.php posts. I want to present the images with different CSS.

Any help? I must be missing something obvious but can’t figure it out.

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