minor - fixed redeclared files inside chat

main/chat/chat.php

@@ -31,7 +31,9 @@
 */
 
 $language_file = array ('chat');
-include('../inc/global.inc.php');
+
+require_once '../inc/global.inc.php';
+
 $nameTools=get_lang('Chat');
 if ($_GET["origin"] != 'whoisonline') {
 	api_protect_course_script(true);

main/chat/chat_banner.php

@@ -31,7 +31,7 @@
 */
 
 $language_file = array ('chat');
-include('../inc/global.inc.php');
+require_once '../inc/global.inc.php';
 $this_section=SECTION_COURSES;
 require_once api_get_path(LIBRARY_PATH).'groupmanager.lib.php';
 

main/chat/chat_footer.php

@@ -1,5 +1,6 @@
 <?php
-require ('../inc/global.inc.php');
+
+require_once '../inc/global.inc.php';
 
 define('FRAME','footer');
 

main/chat/chat_whoisonline.php

@@ -32,9 +32,9 @@
 define('FRAME','online');
 $language_file = array ('chat');
 
-include('../inc/global.inc.php');
-include('../inc/lib/course.lib.php');
-include('../inc/lib/usermanager.lib.php');
+require_once '../inc/global.inc.php';
+require_once api_get_path(LIBRARY_PATH).'course.lib.php';
+require_once api_get_path(LIBRARY_PATH).'usermanager.lib.php';
 
 $course = api_get_course_id();
 $group_id = intval($_SESSION['_gid']);