<!--
/* check first */
if (document.images)
{
/* preload */
po11 = new Image();
po11.src = "graphics/po11.bmp";
po12 = new Image();
po12.src = "graphics/po12.bmp";
po21 = new Image();
po21.src = "graphics/po21.bmp";
po22 = new Image();
po22.src = "graphics/po22.bmp";
po31 = new Image();
po31.src = "graphics/po31.bmp";
po32 = new Image();
po32.src = "graphics/po32.bmp";
po41 = new Image();
po41.src = "graphics/po41.bmp";
po42 = new Image();
po42.src = "graphics/po42.bmp";
po51 = new Image();
po51.src = "graphics/po51.bmp";
po52 = new Image();
po52.src = "graphics/po52.bmp";
po61 = new Image();
po61.src = "graphics/po61.bmp";
po62 = new Image();
po62.src = "graphics/po62.bmp";
}

function On(imageName)
{
 if (document.images)
  {
   document[imageName].src = eval(imageName+"2.src");
  }
}
function Off(imageName)
{
 if (document.images)
  {
   document[imageName].src = eval(imageName+"1.src");
  }
}
// -->