adding isset function to the session class

data/script/furatalog.sessions.php

@@ -34,6 +34,10 @@ class furatalogSessions {
         unset($this->dataObj->{$varName});
     }
 
+    public function issetSessionData() {
+        return isset($this->dataObj->{$varName});
+    }
+
     public function destroy() {
         $this->deleteData($this->cookieKey);
         $this->deleteCookie();