As NEO said, it is JavaScript and XML. The 30,000 foot view is that you create an XMLHTTPRequest object inside Javascript and then do something with it.
Read something as requesting part of an rss feed, making a call to a database, etc etc etc.
There are many books and tutorials out on the net, googling Ajax - Tutorial yeilds about 18,500,000 results.
--Stole this from a moderator
I will only tell you how to do it, not do it for you.
Unless, of course, you want to hire me to do work for you.
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