Using ajax, all you need to do is is create an XML object and submit the text of the javascript box to an aspx page, that will take the values of the text box (appended to a query string) and have it query the database and write it back to the ajax page.
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Read this if you want to know how to get a correct reply for your question:
http://www.catb.org/~esr/faqs/smart-questions.html
^^Took that from planoie's profile^^
^^Modified text taken from gbianchi profile^^
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Technical Editor for:
Professional Search Engine Optimization with ASP.NET
http://www.wiley.com/WileyCDA/WileyT...470131470.html
Discussion:
http://p2p.wrox.com/topic.asp?TOPIC_ID=56429