need advice on autocomplete+multiselect

I want to have an input widget with autocompletion for multiple
entries. Similar to the "to:" filed in Outlook email, enter part of a
name, it autocompletes, enter a semicolon and do the same thing in the
same field.

anyone know of a simple way to do this? I looked through a long list
of plugins and didn't see a canned solution there.

Have you tried

   text_field_with_auto_complete :email, :to, {}, :tokens => ';'

?

That rightmost hash (completion_options) is passed to auto_complete_field, see its documentation.

-- fxn