We are seeing and using this more and more recently:
jQuery is a fast and concise JavaScript Library that simplifies HTML document traversing, event handling, animating, and Ajax interactions for rapid web development. jQuery is designed to change the way that you write JavaScript...
Just like CSS separates "display" characteristics from the HTML structure, jQuery separates the "behavior" characteristics from the HTML structure. For example, instead of directly specifying the on-click event handler in the specification of a button element, a jQuery driven page would first identify the button element, and then modify its on-click event handle.
Here is a very good tutorial on jQuery from a 12 year old:
Some additional background:
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