Index: /trunk/dns.cgi
===================================================================
--- /trunk/dns.cgi	(revision 757)
+++ /trunk/dns.cgi	(revision 758)
@@ -1968,4 +1968,6 @@
 # fill in general URL-to-self
   $page->param(script_self => "$ENV{SCRIPT_NAME}?");
+# fill in the generalized path-to-instance
+  $page->param(webpath => ($ENV{SCRIPT_NAME} =~ m|(/.+)/[^/]+$|)[0]);
 }