JQuery is a great, compact resource available to all whom what to have rich, interactive websites with minimal overhead.

The library is ever expanding, and tying this JavaScript framework into older websites is a breeze.

Not too long ago, creating similar effects took at least double the implementation time, and three times the amount of code to accomplish in JQuery what you can with a single line.

As stated on many blogs and sites, if you have yet to use the JQuery Library, do so.
You will not regret it.