<% form_tag session_path do -%>

Login
<%= text_field_tag 'login' %>

Password
<%= password_field_tag 'password' %>

<%= submit_tag 'Log in' %>

<% end -%> switch to open-id login

<% form_tag session_path do -%>

OpenId
<%= text_field_tag 'openid_url' %>

<%= submit_tag 'Log in' %>

<% end -%> switch to username/password login