Tutorials and tips for ajax effects

i am working on my first rails project. it’s a task manager for my
workplace so users can get on create tasks and assign them to other
users.

they can also add notes to each task they have been assigned to give
updates and whatnot. for the part where the user adds nots, i would like
to keep it on the same page and use scriptaculous or something to have
the comments form slide in underneath each task on the list when
clicked.

i know it’s capable of doing this, and i would imagine it’s pretty easy,
but i’m not sure where to look. are there any tutorials or anything that
explain something like this? i tried looking at the api, but i’m still a
little confused.