--- documentViewer/zpt/toc_thumbs.zpt	2011/08/16 16:27:08	1.3.2.3
+++ documentViewer/zpt/toc_thumbs.zpt	2011/08/24 08:58:20	1.3.2.4
@@ -6,7 +6,7 @@
 </head>
 <body>
   <!-- block used for main content area -->
-  <div class="col_left" metal:define-macro="main"
+  <div class="col-left" metal:define-macro="main"
     tal:define="start pageinfo/start;
                 grpsize pageinfo/groupsize;
                 numgroups pageinfo/numgroups;
