Rails spinoffs - Jul 2007 - Autocomplete Issue

Hey, this ones driving me insane! I hope someone can help, ive
downloaded the script.aculo.us version 1.7.0. I put all the javascript
files in a file called javascripts in my asp.net site. I am trying to
get my autocomplete to get values out of a database based on the
letters i have typed into a textbox. I have a textbox input :

<input type="text" id="autocomplete"
name="autocomplete_parameter"/>
and  a div for the autocomplete choices.

<div id="autocomplete_choices"
class="autocomplete"></div>

The javascript behind this is causing me problems. I am not very good
with javascript. i know to call a new ajax autocompletion extender and
tell it to look for the values in the input and display the found
values in the div :
<script language="javascript" type="text/javascript">

new Ajax.Autocompleter("autocomplete",
"autocomplete_choices", "/url/
on/server", {afterUpdateElement : getSelectionId});
function getSelectionId(text, li) {
    alert (li.id);
}</script>

Just a lil bit confused out how :

1) the results work.
2) the SQL statment would work, is it written in javascript or in a
sql statment?

If anyone has made a autocomplete script.aculo.us from database if
they could help me / give me a simple example code that would be
amazing, this has been driving me mad for about a week now! lol thanks
in advance for all help / advice / links / code etc. si!


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