diff --git a/htdocs/core/class/menubase.class.php b/htdocs/core/class/menubase.class.php
index 584b47a794a..ecdb8752b8a 100644
--- a/htdocs/core/class/menubase.class.php
+++ b/htdocs/core/class/menubase.class.php
@@ -558,7 +558,7 @@ class Menubase
                 if ($menu['enabled'])
                 {
                     $enabled = verifCond($menu['enabled']);
-                    if ($conf->use_javascript_ajax && $conf->global->MAIN_MENU_USE_JQUERY_ACCORDION && preg_match('/^\$leftmenu/',$menu['enabled'])) $enabled=1;
+                    if ($conf->use_javascript_ajax && ! empty($conf->global->MAIN_MENU_USE_JQUERY_ACCORDION) && preg_match('/^\$leftmenu/',$menu['enabled'])) $enabled=1;
                     //print "verifCond rowid=".$menu['rowid']." ".$menu['enabled'].":".$enabled."<br>\n";
                 }
 
diff --git a/htdocs/core/menus/standard/auguria.lib.php b/htdocs/core/menus/standard/auguria.lib.php
index bdaab26bb72..032ea2d500d 100644
--- a/htdocs/core/menus/standard/auguria.lib.php
+++ b/htdocs/core/menus/standard/auguria.lib.php
@@ -270,7 +270,7 @@ function print_left_auguria_menu($db,$menu_array_before,$menu_array_after)
             {
                 if (($alt%2==0))
                 {
-                	if ($conf->use_javascript_ajax && $conf->global->MAIN_MENU_USE_JQUERY_ACCORDION)
+                	if ($conf->use_javascript_ajax && ! empty($conf->global->MAIN_MENU_USE_JQUERY_ACCORDION))
                 	{
                 		print '<div class="blockvmenupair">'."\n";
                 	}
diff --git a/htdocs/main.inc.php b/htdocs/main.inc.php
index cdfbf27cc7d..ff3778025c9 100644
--- a/htdocs/main.inc.php
+++ b/htdocs/main.inc.php
@@ -1095,7 +1095,7 @@ function top_menu($head, $title='', $target='', $disablejs=0, $disablehead=0, $a
 
     if ($conf->use_javascript_ajax)
     {
-        if ($conf->global->MAIN_MENU_USE_JQUERY_LAYOUT)
+        if (! empty($conf->global->MAIN_MENU_USE_JQUERY_LAYOUT))
         {
             print '<script type="text/javascript">
 				jQuery(document).ready(function () {