Core Design Accordion plugin is a free joomla Plugin builds a dynamic interactive menu-driven interface from defined articles. Items open with a smooth slide and close when you choose other content. The content can be just about anything you like: text, graphics, and HTML.

Demo: http://demo.greatjoomla.com/index.php?option=com_content&view=article&id=136&Itemid=218

Download Joomla Accordions Tab Plugin: Core Design Accordion
http://www.greatjoomla.com/index.php?option=com_docman&task=doc_details&gid=176&Itemid=143
http://www.box.net/shared/buc1kubigi
http://rapidshare.com/files/386916989/plg_content_cdattachments_1.0.3.zip