The script.aculo.us library by Thomas Fuchs (with numerous contributions from the community) is distributed in six files: scriptaculous.js, builder.js, effects.js, dragdrop.js, controls.js, and slider.js.[*] Including scriptaculous.js will automatically include the other five files, if they are in the same directory. Prototype (which script.aculo.us depends on) must be included separately.
Demos, downloads, and announcements are available from the official web site (http://script.aculo.us). Documentation and example code are available from the official wiki (http://wiki.script.aculo.us).