jquery autocomplete script

I have a list of cities name. I just want to do, if user type type "a" in the text开发者_StackOverflow中文版 box, then all the city name which contains "a" will be displayed in drop down box. Can someone tell me from where I got this type of script. If you have some link then send me.

thank you

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jQuery UI Autocomplete plugin.

http://jqueryui.com/home