Show and Hide Form Fields with Jquery

Hello, for a time now Ive been trying to find an easy to use (im not a javascript/jquery programmer) and well documented script that allows me to show and hide form elements dynamically using jquery.

Until now Ive used this one: http://www.quirksmode.org/dom/usableforms.html

But despite that it works well, the last version was released a few years ago and I rather have a more recent jquery script.

Any ideas? thanks a lot