Fix some layout problems, and caching issues.

session.lib.php

@@ -1,6 +1,8 @@
 <?
 require_once(realpath(dirname(__FILE__) . '/open_db.lib.php'));
 
+$is_admin = FALSE;
+
 if (isset($_SERVER['HTTPS'])) {
   session_cache_limiter('private');
   session_set_cookie_params(strtotime('+1 year'), '/', '.xxx.org.za', TRUE, TRUE);
@@ -10,12 +12,16 @@ if (isset($_SERVER['HTTPS'])) {
     $is_admin = TRUE;
     $username = $_SESSION['editor'];
   } elseif (check_persistent_login()) {
-    // check_persistent_login() sets $_SESSION['editor']
+    // Note that check_persistent_login() sets $_SESSION['editor']
     $is_admin = TRUE;
     $username = $_SESSION['editor'];
   } else {
     $is_admin = FALSE;
   }
+  // Don't cache if $is_admin is set
+  header( 'Cache-Control: no-store, no-cache, must-revalidate' );
+  header( 'Cache-Control: post-check=0, pre-check=0', false );
+  header( 'Pragma: no-cache' ); 
 }
 
 function check_persistent_login() {