--- loncom/interface/statistics/lonproblemstatistics.pm	2003/11/11 22:14:28	1.61
+++ loncom/interface/statistics/lonproblemstatistics.pm	2003/12/08 19:37:44	1.62
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemstatistics.pm,v 1.61 2003/11/11 22:14:28 matthew Exp $
+# $Id: lonproblemstatistics.pm,v 1.62 2003/12/08 19:37:44 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -51,6 +51,7 @@ package Apache::lonproblemstatistics;
 
 use strict;
 use Apache::lonnet();
+use Apache::loncommon();
 use Apache::lonhtmlcommon;
 use Apache::loncoursedata;
 use Apache::lonstatistics;
@@ -529,7 +530,9 @@ sub output_excel {
     if (length($sheetname) > 31) {
         $sheetname = substr($sheetname,0,31);
     }
-    $excel_sheet = $excel_workbook->addworksheet($sheetname);
+    $excel_sheet = $excel_workbook->addworksheet(
+                       &Apache::loncommon::clean_excel_name($sheetname)
+                                                 );
     #
     # Put the course description in the header
     $excel_sheet->write($rows_output,$cols_output++,