Rails 3 with Ajax on Prototype.js can someone help me with this ?

Hi,

It has been 2 hours that I'm stuck on setting up a rails 3 project to
test it with some Ajax with the Prototype Framework, the problem is
that the tutorial I followed is based on rails 2, and from what I
learned Rails 3 has included some JS Frameworks such Prototype and
jQuery which means that the way to implements those is also different.
help with this please