The following patch against view.rb in docdiff is useful if you have
the following kind of elisp, which shows a docdiff of the current file
controlled with svn. Mozilla will jump to the current point.
Enjoy.
	--dancerj (7 Jan 2006, Junichi Uekawa <dancer@debian.org>)

(defun svndocdiff-current ()
  "Invoke svn docdiff for the current buffer,
and run mozilla-firefox -remote openfile(filename)
to preview the diff"
  (interactive)
  (let* ((currentname 
	  (buffer-file-name (current-buffer)))
	 (svnorigname
	  (concat default-directory
		  ".svn/text-base/" 
		  (file-name-nondirectory 
		   (buffer-file-name (current-buffer)))
		  ".svn-base"))
	 (diff-command
	  "/usr/bin/docdiff --html %s %s > %s")
	 (mozilla-command-line
	  "mozilla-firefox -remote 'openurl(file://%s#currentloc)'")
	 (moztmpfile-name
	  (concat default-directory
		  ".svn/.docdifftmp.html")))
    (insert "
")
    (save-buffer)
    (backward-delete-char 1)
    (shell-command
     (format diff-command 
	     svnorigname 
	     currentname
	     moztmpfile-name)
     "*svndocdiff*" "*svndocdiff-err*")
    (shell-command
     (format mozilla-command-line
	     moztmpfile-name)
     "*svndocdiff*" "*svndocdiff-err*")))


--- view.rb.orig	2006-01-07 18:14:08.000000000 +0900
+++ view.rb	2006-01-07 18:15:50.000000000 +0900
@@ -261,7 +261,8 @@
     [(@eol_char||"") + '</body></html>' + (@eol_char||"")]
   end
   HTMLEscapeDic = {'<'=>'&lt;', '>'=>'&gt;', '&'=>'&amp;', '  '=>'&nbsp;&nbsp;',
-                   "\r\n" => "<br />\r\n", "\r" => "<br />\r", "\n" => "<br />\n"}
+                   "\r\n" => "<br />\r\n", "\r" => "<br />\r", "\n" => "<br />\n", 
+                   "
" => "<a name=\"currentloc\"></a>"}
   HTMLEscapePat = /(\r\n|#{HTMLEscapeDic.keys.collect{|k|Regexp.quote(k)}.join('|')})/m
   def html_tags()
     {:outside_escape_dic  => HTMLEscapeDic,