thingspeak/app/views/layouts/_header.html.erb

<div id="options">
	<% if current_user %>		
		<span class="action"> <%= link_to t(:signout), logout_path, :method => 'delete' %></span>	
	<% else %>
		<span class="action">
			<%= link_to t(:signup), new_user_path %>
		</span>
		<span class="action"> <%= link_to t(:signin), login_path %></span>
	<% end %>
</div>

<div id="logo"><%= link_to t(:application_name), root_path %></div>