Add the four latex2html output directories:  api, ext, lib, tut.
diff --git a/Doc/.cvsignore b/Doc/.cvsignore
index d749f42..acf2f71 100755
--- a/Doc/.cvsignore
+++ b/Doc/.cvsignore
@@ -8,3 +8,7 @@
 *.ps
 *.idx
 *.ilg
+api
+ext
+lib
+tut