Heinrich,
It's frustrating that people don't know a combobox from a select element (or autocomplete text element).
I was finally able to make something like what you're looking for. I used Dan Switzer's Autocomplete as a base, and then had it show all possible options if the text box was either empty or receiving initial focus.
I never use forums for this sort of thing. Let me see if I can upload it....
OK, I think it took.
Set up your options like you normally would with Autocomplete but ADD:
showAll: 1
as one of your options. This is extremely experimental. I just finished it a few hours ago. I've only tested it on FireFox and Safari on Mac.
Shane
jquery.autocomplete.js
