This versatile 1kb horizontal accordion script can be used for menus, images, presentation content and more. I had seen a similar looking feature on the mootools homepage and set out the replicate the functionality as a standalone script and as lightweight as possible. The script will automatically adjust to the number of elements in the accordion and the dimensions of the accordion.

Website: http://www.leigeber.com/2008/05/horizontal-javascript-accordion-menu/