Script-aculo-us, liberia para Prototype a nivel de efectos visuales
http://script.aculo.us/ script.aculo.us provides you with easy-to-use, cross-browser user interface JavaScript libraries to make your web sites and web applications fly
http://script.aculo.us/ script.aculo.us provides you with easy-to-use, cross-browser user interface JavaScript libraries to make your web sites and web applications fly