refocus on text_field

I have this textfield that appears as a drop down section whithin a form
when a link is clicked - so it is it's own partial. The idea is that a
value can be entered within that field and then added to a list, but I
need the cursor to re-focus on that text field so lots and lots of
values can be inputed without having to reclick on that field everytime.

When the form is submitted I clear the textfield by saying:
   :complete => 'document.getElementById("value").value = "";
in my form_remote_tag, but adding this:
doesn't do what I would like it to do. Anyone have an suggestiosn on how
to do this> Thanks,