-<tr id="inbox-<%= message_summary.id %>" class="inbox-row<%= "-unread" if not message_summary.message_read? %>">
+<tr id="inbox-<%= message_summary.id %>" class="inbox-row<%= "-unread" unless message_summary.message_read? %>">
<td class="inbox-sender"><%= link_to h(message_summary.sender.display_name), user_path(message_summary.sender) %></td>
<td class="inbox-subject"><%= link_to h(message_summary.title), message_path(message_summary) %></td>
<td class="inbox-sent"><%= l message_summary.sent_on, :format => :friendly %></td>