Autocomplete Textfield With AJAX And Php?

I saw a neat demo example of this using script.aculo.us and ruby on rails framework to do autocomplete textfield.
http://demo.script.aculo.us

but was wondering if there is anything to run similar on php platform (with AJAX/scriptalicious also doing same effects)?

My current regular old html dropdown list has thousands of clients currently and it is taking >10 seconds filling the <option> list, hence why i am looking to use a short autocomplete list to let user fill in clientname.
Since this page can be edited, i hope there is a framework that knows that fills the text in the textfield appropriately like all the demos i see online,
but it should also set a hidden form field with the ID of the client chosen.

so if they click Update, then i can use that clientID value to update the database. Also if the user erases the text (or maybe fills in half of the text but doesnt choose a client from drop down), the hidden form field clientID should be removed so i know the user is unsetting the optional field/ or hasnt chosen a client.... and i can accordingly update the clientID field to NULL in database.



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[Code]...

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[Code]....

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