-<div id="panel<%= panel.id -%>" class="pettanr-comic-panel" style="width:<%= panel.width %>px;height:<%= panel.height %>px;border-style: solid;border-width: <%= panel.border %>px;border-color:black; background-color:white;">
+<div id="panel<%= panel.id -%>" trace="pettanr-panel_<%= panel.id -%>" class="pettanr-comic-panel" style="width:<%= panel.width %>px;height:<%= panel.height %>px;border-style: solid;border-width: <%= panel.border %>px;border-color:black; background-color:white;">
<% panel.panel_elements.each do |elm| %>
<% case elm.class.to_s %>
<% when 'PanelPicture' %>