jquery spellchecker

The plugin comes with an example PHP script that supports two type of spell checking engines: php’s pspell extension for aspell, or google’s spell checking services. If you are able to use pspell, you will have greater control over your dictionary (with the ability to manage your dictionary words). – using pspell requires you to have aspell installed on the server – using google requires minimal server adjustments, should work on most default PHP installations

via Documentation – jquery-spellchecker – Project Hosting on Google Code.