var HighBW = false;
  var HighBWCheck = true;

  function CheckComplete ()
  {
    if (HighBWCheck)
    {
      if (test.complete) { HighBW = true; }
      else { HighBW = false; }
      HighBWCheck = false;
    }
  }

  if (document.images)
  {
     var imgdir="images/";

     test                    = new Image(100,100);
     var tmp1                = imgdir + "test.jpg?" + Math.random ();
     test.src                = tmp1;

     setTimeout ("CheckComplete ()", 800);
  }