Index: branches/5.1.x/core/admin_templates/js/script.js
===================================================================
diff -u -N -r13545 -r13658
--- branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 13545)
+++ branches/5.1.x/core/admin_templates/js/script.js	(.../script.js)	(revision 13658)
@@ -161,11 +161,11 @@
 
 	var $form = document.getElementById($form_name);
 
-	if (typeof $form.onsubmit == 'function') {
+	if ($.isFunction($form.onsubmit)) {
 		$form.onsubmit();
 	}
 
-	$form.submit();
+	$($form).submit();
 
 	$form.target = '';
 	set_hidden_field('t', t);