code review by fei.hong : fixes bugs to go boys

@@ -15,10 +15,10 @@ class IndexController extends WebAction
     public function indexAction()
     {
         if (isset($_COOKIE['_Channel'])) {
-            unset($_COOKIE['_Channel']);
+            $this->setCookie('_Channel', '');
         }
         if (isset($_COOKIE['_Gender'])) {
-            unset($_COOKIE['_Gender']);
+            $this->setCookie('_Gender', '');
         }
         
         $this->go('http://www.yohobuy.com');