CC-2460: popup doesn't popup again after press X

- fixed

airtime_mvc/application/controllers/PreferenceController.php

@@ -113,6 +113,13 @@ class PreferenceController extends Zend_Controller_Action
     	Application_Model_Preference::SetRemindMeDate($now);
     	die();
     }
+    
+    public function deletesessionvarAction()
+    {
+    	// unset session
+    	Zend_Session::namespaceUnset('referrer');
+    	die();
+    }
 
     public function directoryConfigAction()
     {

airtime_mvc/public/js/airtime/nowplaying/register.js

@@ -1,6 +1,10 @@
 $(document).ready(function(){
 	var dialogGlob;
 	
+	function deleteSessionVar(){
+		$.get("/Preference/deletesessionvar");
+	}
+	
     $.get("/Preference/register", {format:"json"}, function(json){
         var dialog = $(json.dialog);
         dialogGlob = dialog;
@@ -11,6 +15,7 @@ $(document).ready(function(){
             resizable: false,
             modal: true,
             position:['center',50],
+            close: deleteSessionVar,
             buttons: [
                 {
                 	id: "remind_me",