How to realize dynamic chained menu in php and jQuery/ajax?

I'm trying to realize the function similar to the website: site. I know it's done with jQuery. But can someone guide me with more details?

Thanks very much.

Edit:

The function i need is the chained menu and a result set 开发者_如何转开发on the right side. I want the chained menu to be generated automatically from mysql.

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How to realize this function in php?

The site you mentioned uses jquery to perform its tasks. If you are looking to build a similar site, then you will also have to use jquery or some other ajax framework, you can't do it with pure php unless you use xajax which is the ajax framework for php.

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You can look at the source of the page to see how it's done. I doubt that the server side part of this website is hard.