Merge branch 'develop' of http://git.dev.yoho.cn/web/yohobuy into develop

@@ -1027,13 +1027,13 @@ class HelperSearch
                 'order' => 'p_d_asc'
             )));
             $active = '';
-            $desc = true;
+            $desc = '';
         }
         else if (self::$params['order'] == 'p_d_asc') {
             $url = self::buildUrl(array_merge($params, array(
                 'order' => 'p_d_desc'
             )));
-            $desc = false;
+            $desc = true;
             $active = true;
         }
         else {