Easy one

I have the following piece of code in an app:

    @states = LookupValue.find(:all,
                                :conditions => ['record_type = ?',
                                :order => "char_value_1").map {|u|
[u.char_value_1, u.id] }

This builds a list of codes and descriptions from a common values
table. The values are used in a "select" on a page. The page works
fine, however, we would like to have an empty <option> inserted at the
beginning of the list to force the user to actually select an item
from the list. Any suggestions how I can insert an empty/blank code/
description to @states ??