diff -r 6d97dbb189a9 -r f4ed10eaaff8 doc-src/TutorialI/preface.tex
--- a/doc-src/TutorialI/preface.tex	Mon May 13 09:02:13 2002 +0200
+++ b/doc-src/TutorialI/preface.tex	Mon May 13 10:40:59 2002 +0200
@@ -52,11 +52,11 @@
 sessions are now run from within David Aspinall's\index{Aspinall, David}
 wonderful user interface, \hfootref{http://www.proofgeneral.org/}{Proof
   General}, even together with the
-\hfootref{http://www.fmi.uni-passau.de/~wedler/x-symbol/}{X-Symbol} package
-for XEmacs.  This book says very little about Proof General, which has its own
-documentation.  In order to run Isabelle, you will need a Standard ML
-compiler.  We recommend \hfootref{http://www.polyml.org/}{Poly/ML}, which is
-free and gives the best performance.  The other fully supported compiler is
+\hfootref{http://x-symbol.sourceforge.net}{X-Symbol} package for XEmacs.  This
+book says very little about Proof General, which has its own documentation.
+In order to run Isabelle, you will need a Standard ML compiler.  We recommend
+\hfootref{http://www.polyml.org/}{Poly/ML}, which is free and gives the best
+performance.  The other fully supported compiler is
 \hfootref{http://cm.bell-labs.com/cm/cs/what/smlnj/index.html}{Standard ML of
   New Jersey}.