jQuery & jQueryUI Base

HTML

<link rel="stylesheet" href="http://ajax.microsoft.com/ajax/jquery.ui/1.8.7/themes/black-tie/jquery-ui.css">
<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.7/jquery-ui.min.js"></script>
<form id="search_form" method="post" action="/"><input id="search_box" type="text" name="search_box" /></form>

JavaScript

$(document).ready(function() {
    $(function() {
        $("#search_box").autocomplete({
            source: ['Google', 'Yahoo', 'StackOverflow'],
            select: function(event, ui) {
                $(event.target).val(ui.item.value);
                $('#search_form').submit();
                return false;
            },
            minLength: 1
        });
    });
});