NS_IMETHODIMP 
  CBrowserImpl::OnStateChange(nsIWebProgress *progress, nsIRequest *request,
    PRInt32 state, PRUint32 status) {
   
   if ((state & STATE_START) && (state & STATE_IS_DOCUMENT))
   {
     // Navigation has begun
     if(m_pBrowserFrameGlue)
       m_pBrowserFrameGlue->UpdateBusyState(PR_TRUE);
   }

   if ((state & STATE_STOP) && (state & STATE_IS_DOCUMENT))
   {
     // We've completed the navigation
     m_pBrowserFrameGlue->UpdateBusyState(PR_FALSE);
     m_pBrowserFrameGlue->UpdateProgress(0, 100);       // Clear the prog bar
     m_pBrowserFrameGlue->UpdateStatusBarText(nsnull);  // Clear the status bar
   }
   return NS_OK;
  }