How RoR extract a http parameterfrom arequest?

This is request made from the client: new Ajax.Updater("sip_tab_content",            "/rails/test_modules/show/"+$F"boardid"),                     {method :'get',                       onFailure:displaySIPTabFailure,                       onComplete:displaySIPTabFailure                     });

This is controller from the ROR controller acting as server: class TestModulesController < ApplicationController def index     @test_modules = TestModule.find(:all)

    respond_to do |format|       format.html # index.html.erb       format.xml { render :xml => @test_modules }     end   end def show     @test_module = TestModule.find(params[:id]) #TestModule is a module class accessing database     respond_to do |format|       format.html # show.html.erb       format.xml { render :xml => @test_module }     end   end end # index.html.erb:

The parameter value "($F"boardid")" passed by Ajax.Updater is taken by "id". I'm a newbie and didn't know how the "($F"boardid")" is passed into "id". If I want to add one para after "($F"boardid")" , how to pick it from controller?