diff -aburN --exclude='CVS*' --exclude='.svn*' phpgroupware.old/wiki/lib/defaults.php phpgroupware/wiki/lib/defaults.php
--- phpgroupware.old/wiki/lib/defaults.php	2003-03-19 23:57:14.000000000 +0100
+++ phpgroupware/wiki/lib/defaults.php	2005-07-25 12:21:16.000000000 +0200
@@ -164,6 +164,7 @@
                  'parse_wikiname',
                  'parse_bold',
                  'parse_italic',
+                 'parse_strike',
                  'parse_teletype',
                  'parse_heading',
                  'parse_table',
@@ -191,6 +192,7 @@
                 'parse_wikiname',
                 'parse_bold',
                 'parse_italic',
+                'parse_strike',
                 'parse_teletype',
                 'parse_newline',
                 'parse_elements'
@@ -203,6 +205,8 @@
                    'bold_end'     => 'html_bold_end',
                    'italic_start' => 'html_italic_start',
                    'italic_end'   => 'html_italic_end',
+                   'strike_start' => 'html_strike_start',
+                   'strike_end'   => 'html_strike_end',
                    'tt_start'     => 'html_tt_start',
                    'tt_end'       => 'html_tt_end',
                    'head_start'   => 'html_head_start',
diff -aburN --exclude='CVS*' --exclude='.svn*' phpgroupware.old/wiki/parse/html.php phpgroupware/wiki/parse/html.php
--- phpgroupware.old/wiki/parse/html.php	2003-04-17 15:18:55.000000000 +0200
+++ phpgroupware/wiki/parse/html.php	2005-07-25 11:24:40.000000000 +0200
@@ -6,6 +6,10 @@
 //   to generate appropriate HTML.  Together with the template scripts, they
 //   constitue the sole generators of HTML in this script, and are thus the
 //   sole means of customizing appearance.
+function html_strike_start()
+  { return '<strike>'; }
+function html_strike_end()
+  { return '</strike>'; }
 function html_bold_start()
   { return '<strong>'; }
 function html_bold_end()
diff -aburN --exclude='CVS*' --exclude='.svn*' phpgroupware.old/wiki/parse/transforms.php phpgroupware/wiki/parse/transforms.php
--- phpgroupware.old/wiki/parse/transforms.php	2004-09-03 12:46:24.000000000 +0200
+++ phpgroupware/wiki/parse/transforms.php	2005-07-25 11:37:24.000000000 +0200
@@ -233,6 +233,13 @@
                       $text, -1);
 }
 
+function parse_strike($text)
+{
+  return preg_replace("/&lt;strike>(()|[^'].*)&lt;\/strike>/Ue", "pair_tokens('strike', q1('\\1'))",
+                      $text, -1);
+}
+
+
 function parse_teletype($text)
 {
   return preg_replace("/{{({*?.*}*?)}}/Ue",
