var rndNum 
  var imgA
  var imgB

  rndNum = Math.round(Math.random() * 11) + 1;
  imgA = "<img src=/images/ushome/rotate/art_" + rndNum + "a.jpg>";
  imgB = "<img src=/images/ushome/rotate/art_" + rndNum + "b.gif width=21 height=481 border=0>";