diff --git a/sai/modules/saimod_sys_login/js/sai_sys_login_submit.js b/sai/modules/saimod_sys_login/js/sai_sys_login_submit.js
index 7edcf26..e6d9627 100644
--- a/sai/modules/saimod_sys_login/js/sai_sys_login_submit.js
+++ b/sai/modules/saimod_sys_login/js/sai_sys_login_submit.js
@@ -1,3 +1,13 @@
+function getParameterByName(name, url) {
+    if (!url) url = window.location.href;
+    name = name.replace(/[\[\]]/g, "\\$&");
+    var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
+        results = regex.exec(url);
+    if (!results) return null;
+    if (!results[2]) return '';
+    return decodeURIComponent(results[2].replace(/\+/g, " "));
+}
+
 function init_saimod_sys_login() {  
     //jqBootstrapValidation
     $("#login_form input").not("[type=submit]").jqBootstrapValidation({