script.aculo.us is built upon Prototype's Ajax objects. Version 1.5 of script.aculo.us, for example, depends on Prototype v1.4. Thus, to use script.aculo.us's collection of widget controls and special effects, you must import prototype.js along with scriptaculous.js. Simply use script tags in your web pages to include these two files; scriptaculous.js itself then loads its associated dependent code files, such as controls.js and effects.js.
script.aculo.us includes dozens of effects and tools. The following hacks will help you get started with this versatile library.