Select options question

Right now the select I needed looks like this:

<%=
options_from_collection_for_select @states, :id, :name,
@canlocation_options[0] %>
I want to add in :prompt => , or :blank => but then I’m exceding the
parameters, 5 for 4.
Any maybe this is an HTML question, but is there somewhere I can add in
a
blank selection ?

TIA
Stuart