JQuery.js problem

Hello,

In my view, I am showing password strength. I had added jquery.js in
assets/javascripts. It worked. Then in the UI :- :confirm stopped
working
in button_to. I was wondering why. But today I came to know that in
rails
3.0 & above jquery.js is not required. So I deleted it. But something
wrong
happened. now my password strength seems not to be working. & not
redirecting.

Any solutions ?
Thanks