The c7collapze module, based on jQuery for the Joomla 1.5.x.
If you want to display several essential Joomla modules and save space on your website, this is the extension you are looking for.
The module embeds existing installed modules and displays in a collapsible div structure.
The collapsible divs can be expanded and collapsed as desired, by clicking on the embedded module title.
The c7collapze module for Joomla 1.6 is available in the downloads page.
Installation document and the Module's installation zip format are available in the downloads page.
Please refer here for description of the module features : c7collapze details