This feature was available beginning with version 2.0. It has been replaced by ColorBox in tw >=4.0 due to licensing issues. This page is here for archives and history, you should not use Shadowbox.
Shadowbox feature allows adding fancy effects on image galleries, images, modules and content once enabled. It requires mootools or jquery enabled also in Admin > Features in order to work.
Requirements
Shadowbox 1.0 is third party LGPL-ed JS library which adds eye candy for displaying images and other documents including multimedia (Please note that Shadowbox 2.0 is not used, because of author's change to incompatible license).
It can be enabled on Admin → Features and requires any JS framework of your choice (it has adapters for jQuery, Mootools, Prototype, ExtJS, etc...).
We recommend Mootools which is already included in Tiki. To make Shadowbox work out of the box just be sure Mootools are enabled as well.
Tiki 2.0+ only In case you are using custom tiki.tpl or header.tpl files from previous 1.9 theme styles, you'll need to upgrade your customized files from the default ones for Tiki 2.0+.