gistfile1.rhtml

<% form_tag(params[:acs_url], :id => '3dform') do %>
  <%= hidden_field_tag :PaReq, params[:pa_req] %>
  <%= hidden_field_tag :MD, params[:md] %>
  <%= hidden_field_tag :TermUrl, three_d_complete_order_payment_url(@order) %>
  <noscript>
    <p>Click the button below to continue with verification.</p>
    <%= submit_tag 'Continue with Card Verfication' %>
  </noscript>
<% end %>

<% javascript_tag do %>
  window.onload=function(){
    document.getElementById('3dform').submit();
  }
<% end %>