Rails - Apr 2006 - text_field_with_auto_complete and foreign characters

I need a form where the user must enter a city name. I would like to use 
an autocomplete_field for the city name, so I have the following code in 
my view:

<%= text_field_with_auto_complete ''entry'',
''city_name'', :size => 40 %>

and in my controller I have the method:

def auto_complete_for_entry_city_name
  @cities = City.find(:all,
                      :conditions => [ ''LOWER(name) LIKE
?'',
params[:entry][:city_name].downcase + ''%''],
                      :order => ''name ASC'',
                      :limit => 10)
  render :partial => ''cities''
end

This works fine, except when the city name has german umlauts like in 
''Z?rich''. It looks like I get the raw text from the city field
in my
action method.
I then tried to use the observe_field feature like this:

<input type="text" id="city_name"
name="city_name" size="40" />
<%= observe_field(:city_name,
                  :frequency => 0.5,
                  :update => :results,
                  :url => { :controller => ''entries'',
                  :action => :find_city, },
                  :with => "''city_name='' +
escape($F(''city_name''))" )%>
<div class="autocomplete" id="results"></div>

This works fine with umlauts, too. The :with-option does the trick. 
Unfortunately this is not what I need, I want an autocplete field. Is 
there a way to escape the text from my input field using "the 
text_field_with_auto_complete" ?

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