sending radio button value through auto_complete

I've got an autocomplete field   text_field_with_auto_complete(:query, :text, {}, :skip_style => true, :tokens => ",") and some radio buttons in the same form :   radio_button_tag(:domain, "product", :checked => true)   radio_button_tag(:domain, "user")

but in my controller function "auto_complete_for_query_text" i don't know how to take radio buttons values. someone can help me?

Regards.