Smashing plugin, very thorough work! We highly consider using it on the major pages of a large (500 PI/ second) site! It adds both functionality and coolness.
If I could make a few suggestions: 1) Make the text "Image" and "of" configurable. That way we won't have to edit your plugin if ut's upgraded. 2) Untie the showing of the next-prev-navigation from the showing of the caption. Now if there is no caption (title attribute) the nav links wont be triggered at all. 3) Would you consider making the transitions configurable, at least the speed? Although it's extremely cool, in a lot of everyday situations immediate response would be desireable. I believe this plugin is, and has the potential to be both very useful AND cool at the same time. In my case (the result pages for a major classifieds site) I have the need to add a second attribute to the outer a tag, i.e. the rel attribute, to give the user the possibility to go directly to a detail page about the item he/she is watching. I'd present this link next to the caption below, or perhaps as a href around the caption. It would be a tall order to hand to you, but perhaps you would consider it? Say, if the rel attribute is present, wrap it around the caption as an <a href="[rel]">[caption]</a>. I'm happy to help with the implementation, but it isn't exactly rocket science, and I guess you'll have it done in no time. Best regards and thank you for a great plugin, Erlend Schei :)
