Regarding PDF Writer

Hello guys,
             I have a problem with saving the pdf....
  This is my controller code -------------------

  def getpdf
      pdf = PDF::Writer.new
      @room_event = RoomEvent.find(:all)
      @table=PDF::SimpleTable.new
      @table.column_order = RoomEvent.column_names
      data = []
      @room_event.each do |room_event|
        data.push({"name" => room_event.name, "description" =>
room_event.description, "id" => room_event.id})
      end
      @table.data.replace data
      @table.render_on(pdf)
      pdf.save_as("public/pdf/hello.pdf")
  end

There is one more file called getpdf.rpdf in which i havnt put any
code...

and there is a link in a some other rhtml file which calls this getpdf
action.
<%= link_to "get pdf", :action => "getpdf" %>

Now when i click on that link "get pdf" it asks me where to save this
file. and also it saves the file in pdf folder. but i just want it to
save in that pdf folder and doesnt want it to ask me explicitly.

Can anyone suggest me any ideas how can i do this... i am very new to
these concepts....
Can anyone help??