[jQuery] Autocomplete Plugin help

[jQuery] Autocomplete Plugin help

Hi there,
Would anyone be able to help me out? I'm trying to code a livesearch
widget for Wordpress using G. van den Hoven's Autocomplete plugin.
I've tried to look through the source to try find what I need, but can't.
I have my widget that I initialises the plugin, and an input for where
I accept the user typing in, but what I cannot work out is how to take
each keypress and pass that into a PHP file to do the search. I'd
prefer to wait until at least the first 3 characters have been put in
before firing this off, but this is not essential.
code:
<script type="text/javascript">
        //
        // Page script
        $(document).ready(function() {
            $('input.#livesearch').autoComplete($('#center'), '<?php
bloginfo('template_url'); ?>/search.php');
        });
</script>
    
<div id="search">
    <div>
        <input type="text" name="livesearch" id="livesearch" value="Live Search" />
    </div>
</div>
Can anyone suggest what I do?
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