diff --git a/lib/client/dom.js b/lib/client/dom.js
index 83502ad0..65968a66 100644
--- a/lib/client/dom.js
+++ b/lib/client/dom.js
@@ -1528,7 +1528,7 @@ var CloudCmd, Util, DOM, CloudFunc, Dialog;
                     current     = this.getCurrentFile(),
                     files       = current.parentElement,
                     panel       = files.parentElement,
-                    isLeft      = DOM.isContainClass(panel, 'left');
+                    isLeft      = panel.id === 'js-left';
                     
                 /* if {active : false} getting passive panel */
                 if (pActive && !pActive.active) {