app/views/unattached_interventions/_participant.html.erb
<%= div_for participant do %>
<% if participant.user %>
<span <%="style='color:red'" unless participant.intervention.student.belongs_to_user? participant.user %> >
<%="#{participant.fullname}" %></span>
<%= link_to_remote("X", unattached_intervention_path(participant),:method=>:delete) %>
<% end %>
<% end %>