anchor.diff:              <% if !@selected_topics.nil? && @selected_topics.size != 0 %>
                   <% for selected_topic in @selected_topics %>
                       <% if selected_topic.topic_id == topic.id %>
  -                        <td align="center"><%= link_to image_tag('delete_icon.png', :border => 0, :title => 'Leave Topic', :align => 'middle'), :controller=>'sign_up_sheet', :action=> 'delete_signup', :id => topic.id, :assignment_id => params[:id] %></td>
  +                        <td align="center" bgcolor = "yellow"><%= link_to image_tag('delete_icon.png', :border => 0, :title => 'Leave Topic', :align => 'middle'), :controller=>'sign_up_sheet', :action=> 'delete_signup', :id => topic.id, :assignment_id => params[:id] %></td>
                           <%action_symbol_added = true%>
                       <% end %>
                   <% end %>
  
positive.code: 
    <% i=1 %>
    <% for topic in @sign_up_topics %>
        <tr>
          <td><%=topic.topic_identifier%></td>
          <td><%= topic.topic_name %></td>
          <td align="center"><%= topic.max_choosers %></td>
  
negative.code: <h1>Signup sheet for <%= Assignment.find(params[:id]).name %> assignment</h1>
  	<table class="general">
  	  <tr>
  	    <th width="5%">Topic #</th>
  	    <th width="75%">Topic name(s)</th>
  	    <th width="5%">Max choosers</th>
  	    <th width="5%">Available slots</th>
  	    <th width="5%">Waitlist</th>
  	    <%if @show_actions%>
  	    <th width="5%">Action</th>
  	    <%end%>
  	  </tr>
  
    <% if !@selected_topics.nil? && @selected_topics.size != 0 %>
        <b>Your topic(s):</b>
  