function openPop(windowname, url, width, height, title)
    {
      var m = GetRadWindowManager();
      var w = m.GetWindowByName(windowname);
      w.SetUrl(url);
      
      if (width && height) 
        w.SetSize(width,height);
        
      if (title)
          w.SetTitle(title)
      w.Show();
      w.Center();
    }