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Why don't my galleries use Multibox when I click on the images?

This plugin only adds the required headers (both JavaScript and CSS) for Multibox, it does not enable content to use Multibox directly. You'll have to use an other plugin for that, or manually edit your content as per the Multibox instructions.

What is Multibox

It's a lightbox-style JavaScript library but with better support for media, including Flash movies. Read more at the Multibox website.