diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index 1d70d4cbf0a..bfef30294fe 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1484,7 +1484,7 @@ function top_menu($head, $title='', $target='', $disablejs=0, $disablehead=0, $a
 	{
 		print "\n".'<!-- Start top horizontal -->'."\n";
 
-		print '<div class="side-nav-vert"><div id="id-top">';
+		print '<div class="side-nav-vert'.(GETPOST('dol_invisible_topmenu','int')?' hidden':'').'"><div id="id-top">';		// dol_invisible_topmenu differs from dol_hide_topmenu. dol_invisible_topmenu means we output menu but we make it invisible.
 
 		// Show menu entries
 		print '<div id="tmenu_tooltip'.(empty($conf->global->MAIN_MENU_INVERT)?'':'invert').'" class="tmenu">'."\n";