function view_point_window()
{
  var popw = (screen.width - 720) / 2; 
  var poph = (screen.height - 650) / 2; 
  window.open('/mp/win_mypoint.php','view_point','width=720,height=650,resizable=yes,scrollbars=yes,left='+popw+',top='+poph);
}