--- a
+++ b/inst/private/get_root.m
@@ -0,0 +1,32 @@
+## Copyright (C) 2008 Soren Hauberg
+##
+## This program is free software; you can redistribute it and/or modify it
+## under the terms of the GNU General Public License as published by
+## the Free Software Foundation; either version 3 of the License, or (at
+## your option) any later version.
+##
+## This program is distributed in the hope that it will be useful, but
+## WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+## General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## THIS FUNCTION SHOULD BE private
+
+function root = get_root (outdir, subdir)
+  web_sep = '/';
+  
+  if (outdir (end) == web_sep)
+    outdir (end) = [];
+  endif
+  
+  if (subdir (end) == web_sep)
+    subdir (end) = [];
+  endif
+  
+  n = sum (subdir == web_sep) - sum (outdir == web_sep);
+  root = repmat ("../", 1, n);
+endfunction