edit

front/static/document.js

@@ -149,7 +149,7 @@ var Document =
         var doc = $('.demeter_document').eq(i);
         doc.hide();
         var url = doc.attr('data-page-url');
-        var parent = do c.parent();
+        var parent = doc.parent();
         var index = layer.load(0, {shade: false});
         $.getJSON(url + '&callback=?', function(t)
         {