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diff --git a/octave_packages/m/help/doc.m b/octave_packages/m/help/doc.m
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+## Copyright (C) 2005-2012 Søren Hauberg
+##
+## This file is part of Octave.
+##
+## Octave 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.
+##
+## Octave 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 Octave; see the file COPYING.  If not, see
+## <http://www.gnu.org/licenses/>.
+
+## -*- texinfo -*-
+## @deftypefn {Command} {} doc @var{function_name}
+## Display documentation for the function @var{function_name}
+## directly from an on-line version of
+## the printed manual, using the GNU Info browser.  If invoked without
+## any arguments, the manual is shown from the beginning.
+##
+## For example, the command @kbd{doc rand} starts the GNU Info browser
+## at the @code{rand} node in the on-line version of the manual.
+##
+## Once the GNU Info browser is running, help for using it is available
+## using the command @kbd{C-h}.
+## @seealso{help}
+## @end deftypefn
+
+## Author: Soren Hauberg <soren@hauberg.org>
+## Adapted-by: jwe
+
+function retval = doc (fname)
+
+  if (nargin == 0 || nargin == 1)
+
+    ftype = 0;
+
+    if (nargin == 1)
+      ## Get the directory where the function lives.
+      ## FIXME -- maybe we should have a better way of doing this.
+
+      if (ischar (fname))
+        ftype = exist (fname);
+      else
+        error ("doc: expecting argument to be a character string");
+      endif
+    else
+      fname = "";
+    endif
+
+    if (ftype == 2 || ftype == 3)
+      ffile = which (fname);
+    else
+      ffile = "";
+    endif
+
+    if (isempty (ffile))
+      info_dir = octave_config_info ("infodir");
+    else
+      info_dir = fileparts (ffile);
+    endif
+
+    ## Determine if a file called doc.info exist in the same
+    ## directory as the function.
+
+    info_file_name = fullfile (info_dir, "doc.info");
+
+    [stat_info, err] = stat (info_file_name);
+
+    if (err < 0)
+      info_file_name = info_file ();
+    endif
+
+    ## FIXME -- don't change the order of the arguments below because
+    ## the info-emacs-info script currently expects --directory DIR as
+    ## the third and fourth arguments.  Someone should fix that.
+
+    cmd = sprintf ("\"%s\" --file \"%s\" --directory \"%s\"",
+                   info_program (), info_file_name, info_dir);
+
+    have_fname = ! isempty (fname);
+
+    if (have_fname)
+      status = system (sprintf ("%s --index-search %s", cmd, fname));
+    endif
+
+    if (! (have_fname && status == 0))
+      status = system (cmd);
+      if (status == 127)
+        warning ("unable to find info program `%s'", info_program ());
+      endif
+    endif
+
+    if (nargout > 0)
+      retval = status;
+    endif
+
+  else
+    print_usage ();
+  endif
+
+endfunction
+
+%!test if exist( info_file ()) != 2 && exist (sprintf ("%s.gz", info_file ())) != 2
+%!       error ("Info file %s or %s.gz does not exist!", info_file (), info_file ());
+%!     endif