[jQuery] filtering a multiple select box

[jQuery] filtering a multiple select box


i would like to filter out option on an select box as i type my value
in a textbox. I would work sorf of like autocomplete without the
autocompleting part.
Its implemented here but the code seems is very complex as there are
many other things going on.
http://www.headcircus.com/uiguy/selectboxfactory/selectboxfactory.html
I just want it on a plain select box.
does this sound easy or would it require several lines of code?