Index: includes/tablesort.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/tablesort.inc,v
retrieving revision 1.30
diff -u -F^f -r1.30 tablesort.inc
--- includes/tablesort.inc	21 Nov 2004 08:25:17 -0000	1.30
+++ includes/tablesort.inc	27 Jan 2005 16:56:32 -0000
@@ -1,3 +1,8 @@
+From killesreiter@physik.uni-freiburg.de Thu Jan 27 17:55:38 2005
+Date: Thu, 27 Jan 2005 14:37:12 +0100
+From: killesreiter@physik.uni-freiburg.de
+To: gerhard@killesreiter.de
+
 <?php
 // $Id: tablesort.inc,v 1.30 2004/11/21 08:25:17 dries Exp $
 
@@ -74,7 +79,8 @@ function tablesort_sql($header, $before 
  */
 function tablesort_header($cell, $header, $ts) {
   // Special formatting for the currently sorted column header.
-  if (is_array($cell) && $cell['field']) {
+  if (is_array($cell) && isset($cell['field'])) {
+    $title = t('sort by %s', array('%s' => $cell['data']));
     if ($cell['data'] == $ts['name']) {
       $ts['sort'] = (($ts['sort'] == 'asc') ? 'desc' : 'asc');
       $cell['class'] = 'active';
@@ -84,8 +90,8 @@ function tablesort_header($cell, $header
     else {
       // If the user clicks a different header, we want to sort ascending initially.
       $ts['sort'] = 'asc';
+      $image = '';
     }
-    $title = t('sort by %s', array('%s' => $cell['data']));
     $cell['data'] = l($cell['data'] . $image, $_GET['q'], array('title' => $title), 'sort='. $ts['sort'] .'&amp;order='. urlencode($cell['data']). $ts['query_string']);
 
     unset($cell['field'], $cell['sort']);
@@ -110,7 +116,7 @@ function tablesort_header($cell, $header
  *   A properly formatted cell, ready for _theme_table_cell().
  */
 function tablesort_cell($cell, $header, $ts, $i) {
-  if ($header[$i]['data'] == $ts['name'] && $header[$i]['field']) {
+  if (isset($header[$i]) && $header[$i]['data'] == $ts['name'] && $header[$i]['field']) {
     if (is_array($cell)) {
       if (isset($cell['class'])) {
         $cell['class'] .= ' active';
@@ -135,6 +141,7 @@ function tablesort_cell($cell, $header, 
  */
 function tablesort_get_querystring() {
   $cgi = $_SERVER['REQUEST_METHOD'] == 'GET' ? $_GET : $_POST;
+  $query_string = '';
   foreach ($cgi as $key => $val) {
     if ($key != 'order' && $key != 'sort' && $key != 'q') {
       $query_string .= '&amp;'. $key .'='. $val;
@@ -154,18 +161,18 @@ function tablesort_get_querystring() {
  *   - "sql": The name of the database field to sort on.
  */
 function tablesort_get_order($headers) {
-  $order = $_GET['order'];
+  $order = isset($_GET['order']) ? $_GET['order'] : '';
   foreach ($headers as $header) {
-    if ($order == $header['data']) {
+    if (isset($header['data']) && $order == $header['data']) {
       return array('name' => $header['data'], 'sql' => $header['field']);
     }
 
-    if ($header['sort'] == 'asc' || $header['sort'] == 'desc') {
+    if (isset($header['sort']) && ($header['sort'] == 'asc' || $header['sort'] == 'desc')) {
       $default = array('name' => $header['data'], 'sql' => $header['field']);
     }
   }
 
-  if ($default) {
+  if (isset($default)) {
     return $default;
   }
   else {
@@ -188,7 +195,7 @@ function tablesort_get_order($headers) {
  *   The current sort direction ("asc" or "desc").
  */
 function tablesort_get_sort($headers) {
-  if ($_GET['sort']) {
+  if (isset($_GET['sort'])) {
     return ($_GET['sort'] == 'desc') ? 'desc' : 'asc';
   }
   // User has not specified a sort. Use default if specified; otherwise use "asc".