--- weblib.php	Fri Nov 17 12:27:47 2006
+++ weblib-CHANGED.php	Fri Nov 24 23:11:01 2006
@@ -4871,7 +4871,11 @@
             $pagenum = $page - 1;
             $output .= '&nbsp;(<a  href="'. $baseurl . $pagevar .'='. $pagenum .'">'. get_string('previous') .'</a>)&nbsp;';
         }
-        $lastpage = ceil($totalcount / $perpage);
+        if ($perpage >0) {
+          $lastpage = ceil($totalcount / $perpage);
+        } else {
+          $lastpage = 1;  
+        }
         if ($page > 15) {
             $startpage = $page - 10;
             $output .= '&nbsp;<a href="'. $baseurl . $pagevar .'=0">1</a>&nbsp;...';