This is the code that i replaced the bootstrap stuff with. It is missing something.

gistfile1.txt

<%-# from users/index.html.erb -%>
<a href="roles#<%= user.id %>" data-reveal-id="roleModal" class="button" type="button">Change role</a>
        <%= render user %>


<%-# from users/_roles.html.erb-%>
<div id="roleModal" class="reveal-modal">
  <%= semantic_form_for user, :url => user_path(user), :html => {:method => :put } do |f| %>
      <h3>Change Role</h3>
    <div class="reveal-modal-body">
      <%= f.input :roles, :as => :check_boxes, :input_html => { :selected => user.role_ids } %>
    </div>
    <a class="close-reveal-modal">&#215;</a> 
      <%= f.submit "Change Role", :class => "button" %>
  <% end %>
</div>