Note: The secret is in the colon ( : ) in the post_type. This is not a valid character for post types, so we can invent pseudo post types before the colon and do what we like.
This is a simple test of the oik-nivo-slider version 1.2, which is dependent upon oik version 1.2 In the new version I have added some logic to display slideshows of plugin screenshots.The main reason for doing this is to be able to give an example of the oik nivo slider without changing the content of your site. The screenshot-n.png files that are displayed are already installed in your website. All we ask oik-nivo-slider to do is to display them. The code has been written so that you can control how many of the images are display. [nivo post_type=screenshot:oik-nivo-slider offset=3 numberposts=6] With a bit of luck this shortcode should display screenshot-4 to screenshot-6 of the screenshots for version 1.2