Removed warning

htdocs/main.inc.php

@@ -1145,7 +1145,7 @@ function top_menu($head, $title='', $target='', $disablejs=0, $disablehead=0, $a
     		</script>';
 		}
 
-		if ($conf->global->MAIN_MENU_USE_JQUERY_ACCORDION)
+		if (! empty($conf->global->MAIN_MENU_USE_JQUERY_ACCORDION))
 		{
 			print "\n".'<script type="text/javascript">
 					jQuery(document).ready(function () {