Index: geshi.php
===================================================================
--- geshi.php	(revision 2486)
+++ geshi.php	(working copy)
@@ -445,13 +445,13 @@
      * The overall style for this code block
      * @var string
      */
-    var $overall_style = 'font-family:monospace;';
+    var $overall_style = 'font-family:monospace, Courier;';
 
     /**
      *  The style for the actual code
      * @var string
      */
-    var $code_style = 'font: normal normal 1em/1.2em monospace; margin:0; padding:0; background:none; vertical-align:top;';
+    var $code_style = 'font: normal normal 1em/1.2em monospace, Courier; margin:0; padding:0; background:none; vertical-align:top;';
 
     /**
      * The overall class for this code block