--- galculator-1.2.3/src/callbacks.orig	2004-10-21 18:00:01.000000000 +0200
+++ galculator-1.2.3/src/callbacks.c	2004-10-21 18:01:28.000000000 +0200
@@ -113,6 +113,12 @@
 	gtk_widget_destroy (gtk_widget_get_toplevel ((GtkWidget *)button));
 }
 
+void 
+show_help (void)
+{
+	system("gpe-helpviewer /usr/share/help/calculator/index.html");
+}
+
 /* this callback is called if a button for entering a number is clicked. There are two
  * cases: either starting a new number or appending a digit to the existing number.
  * The decimal point leads to some specialities.