randomize hello interval to avoid synced hello
diff --git a/chatdialog.h b/chatdialog.h
index 9a64ad0..8846a4b 100644
--- a/chatdialog.h
+++ b/chatdialog.h
@@ -80,6 +80,7 @@
   boost::mutex m_msgMutex;
   boost::mutex m_sceneMutex;
   time_t m_lastMsgTime;
+  int m_randomizedInterval;
 
   // icon related
   QAction *minimizeAction;