Rails - Jun 2007 - Search Form

Hi All
this is driving me batty.
I am trying to do a search, the form I have created has radio buttons
and a text field

_full_search.rhtml
<p>Staff Number<%= radio_button_tag(:search,:staff,0) %>
NI Number<%= radio_button_tag(:search, :staff, 1) %>
File Number<%= radio_button_tag(:search, :staff, 2) %>
name<%= radio_button_tag(:search, :staff, 3) %></p>
<p><%= text_field(:search_text, "",
"size"=>10)%></p>

The controller should then check which button is checked and search as
appropriate, there is placeholder text for this as the moment as no
matter which button I check, I always get the same output!
help!
controller
def staff_search
    @search_text = params[:search]
    @word = params[:search_text]
     if @search_text = "staff0"
       @word = 1
       if @search_text = "staff1"
         @word = 2
         if @search_text = "staff2"
            @word = 3
            else @word = 2
            end
          end
        end
   end


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