<% unless @trace.public? %>
<td><%= button_to 'Make this track public permanently', :controller => 'trace', :action => 'make_public', :id => @trace.id %></td>
<% end %>
<% unless @trace.public? %>
<td><%= button_to 'Make this track public permanently', :controller => 'trace', :action => 'make_public', :id => @trace.id %></td>
<% end %>