anchor.diff:  <ul>
     <%if SignUpTopic.find_by_assignment_id(@assignment.id)%>
       <li> 
  -      <% if @participant.special_role != 'reader' %>
  +      <% if @participant.special_role == 'participant' %>
           <%= link_to 'Signup sheet', :controller=>'sign_up_sheet', :action => 'list', :id => @participant.parent_id%>
         <% else %>
           <font color="gray">Signup sheet</font>
  
positive.code:   <% else %>
        Submit or Review work for <%= link_to @assignment.name, @assignment.spec_location %>
    <% end %>
  </h1>
  
  <div class="flash_note">
  
negative.code: to display the label "Your team" in the student assignment tasks-->
    <%if @assignment.team_assignment? %>
      <li> 
        <% if @participant.special_role == 'participant' %>
          <%= link_to 'Your team', view_student_teams_path(student_id: @participant.id) %>
        <% else %>
          <font color="gray">Your team</font>
  