<!-- a obtenir -->
<div class="content-box">
  <div class="content-box-header">
    <h3 style="cursor: s-resize;">  <%= title %></h3>
  </div>
  <div class="content-box-content">
    <div class="tab-content default-tab" style="display: block;">
# BLOCK
    </div>
  </div>
</div>

<!-- .erb -->
<%= block do %>
#BLOCK
<% end %>

<!-- helper -->
def block(&block)
   content_tag :div, :class => "content_box" do
	content_tag :div, :class => "content-box-header" do
        	content_tag :h3, "huhu", :style => "cursor: s-resize;"
	end
	content_tag :div , :class =>  "content-box-content" do
		content_tag :div, :class => "tab-content default-tab", :style=>"display: block;" do
			capture(&block)
		end
	end
   end
end



<!--  obtenu ds le navigateur -->
	<div class="content_box">
            <div class="content-box-content">
               <div style="display: block;" class="tab-content default-tab">
<!-- BLOCK -->
              </div>
           </div>
       </div>