require 'rubygems'
require 'mechanize'

a = Mechanize.new
a.get(login_url) do |page|
  login_page = a.click(page.link_with(:text => /Log In/))

  my_page = login_page.form_with(:action => '/Login.action') do |f|
    f.identity   = login
    f.password   = password
  end.click_button

  puts my_page.inspect
end