jquery search custom

See this site http://g1.globo.com/ has a custom se开发者_如何学运维arch field that uses jquery for any of the bottom also if placed a value in less than 2 appears a custom alert.

I am hours here trying to find a solution to copy me and I can not, I am totally a layman and not getting to.

If a friend i know and can get me the code I am grateful.

I thank, Thanks

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http://jqueryui.com/demos/autocomplete/

and check out the minLength attribute