What in the heck is JSONP and why would you use it? | InsideRIA
http://www.insideria.com/2009/03/what-in-the-heck-is-jsonp-and.html
<html> <head> <script src="/jquery/jquery.js"></script> <script> $(function() { var req = 'http://search.yahooapis.com/WebSearchService/V1/webSearch?appid=YahooDemo&query=finances&format=pdf&output=json' $.getJSON(req,{}, function(data) { console.dir(data) }); }); </script> </head> <body> </body> </html>Cross-domain communications with JSONP, Part 1: Combine JSONP and jQuery to quickly build powerful mashups
&callback=?How to build a web widget (using jQuery) - Alex Marandon
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