diff -Naur /home/greg/TDevel/cvs/axiom/src/hyper/event.pamphlet ./event.pamphlet
--- /home/greg/TDevel/cvs/axiom/src/hyper/event.pamphlet	2005-01-30 12:49:54.000000000 +0100
+++ ./event.pamphlet	2006-11-10 17:36:45.000000000 +0100
@@ -659,6 +666,19 @@
     HyperDocPage *page = NULL;
     char *page_name;
 
+
+    if (event->window == gWindow->fMainWindow || 
+        event->window == gWindow->fScrollWindow) {
+      if(button == 4){
+        scrollUp();
+        return;
+      }
+      else if (button == 5){
+        scrollDown();
+        return;
+      }
+    }
+
     /* find page name from sub-window handle */
 
     link = get_hyper_link(event);