+<form id=eval method=post style="<%= param('code') ? '' : 'display:none' %>">
+<input type=hidden name=name value="<%= $name %>">
+<div style="float: right">
+Eval code on each facet <tt>$value</tt> and <tt>$count</tt>
+<pre>
+$out->{sum} += $value * $count;
+$out->{sum}->{ $checked ? 'on' : 'off' } += $count;
+$checked = 1 if $count > 10;
+</pre>
+</div>
+% if ( my $out = stash('out') ) {
+<pre id=out><%= dumper $out %></pre>
+% }
+% my $rows = scalar split(/\n/,param('code'));
+<textarea name=code rows=<%= $rows %>><%= param('code') %></textarea>
+<input type=submit value="Eval on facet values">
+<input id=close name=close type=button value="Close" style="float: right">