Index: includes/theme.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/theme.inc,v
retrieving revision 1.385
diff -u -p -r1.385 theme.inc
--- includes/theme.inc	25 Sep 2007 12:43:18 -0000	1.385
+++ includes/theme.inc	4 Oct 2007 13:10:17 -0000
@@ -1282,20 +1282,23 @@ function theme_table($header, $rows, $at
     drupal_add_js('misc/tableheader.js');
 
     $ts = tablesort_init($header);
-    $output .= ' <thead><tr>';
+    // HTML requires that the thead tag has tr tags in it follwed by tbody
+    // tags. Using ternary operator to check and see if we have any rows.
+    $output .= (count($rows) ? ' <thead><tr>' : ' <tr>');
     foreach ($header as $cell) {
       $cell = tablesort_header($cell, $header, $ts);
       $output .= _theme_table_cell($cell, TRUE);
     }
-    $output .= " </tr></thead>\n";
+    // Using ternary operator to close the tags based on whether or not there are rows
+    $output .= (count($rows) ? " </tr></thead>\n" : "</tr>\n");
   }
   else {
     $ts = array();
   }
 
   // Format the table rows:
-  $output .= "<tbody>\n";
   if (count($rows)) {
+    $output .= "<tbody>\n";
     $flip = array('even' => 'odd', 'odd' => 'even');
     $class = 'even';
     foreach ($rows as $number => $row) {
@@ -1335,9 +1338,10 @@ function theme_table($header, $rows, $at
         $output .= " </tr>\n";
       }
     }
+    $output .= "</tbody>\n";
   }
 
-  $output .= "</tbody></table>\n";
+  $output .= "</table>\n";
   return $output;
 }