<%= product.description %>
<div class="price-line">
<span class="price"><%= number_to_currency product.price, :unit => "£" %></span>
- <%= button_to "Add to cart", :action => "add_to_cart", :id => product %>
+ <% form_remote_tag :url => {:action => 'add_to_cart', :id => product} do %>
+ <%= submit_tag "Add to cart" %>
+ <% end %>
</div>
</div>
<% end %>