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If you are familiar with using select boxes for categorisation and sub-categories, such as ebay does when selling an item, usually this can require a lot of JavaScript to maintain the select boxes, but jQuery can hugely simplify this task by adding a dash of AJAX.

The Goal

Allow the user to select a top level category from one select box and to automatically populate the sub-category.

Prerequisites

1. Latest copy of jQuery
2. A basic understanding of JSON (don't let this put you off - it's really very, very easy)
3. A server-side script that can respond to the AJAX request (though I've provided a simple example)

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