function BtTM(flag, position)
{
if ((navigator.userAgent.indexOf("a/3",0) >= 0) || (navigator.userAgent.indexOf("a/4",0) >= 0))
  {
  var NewBtTM = eval(flag + ".src");
  document.images[position].src=NewBtTM;
  }
}

if ((navigator.userAgent.indexOf("a/3",0) >= 0) || (navigator.userAgent.indexOf("a/4",0) >= 0))
{
BtTM1s =  new Image();
BtTM1s.src = "pics/topmenu0.jpg";
BtTM1b =  new Image();
BtTM1b.src = "pics/topmenu0b.jpg";
BtTM2s =  new Image();
BtTM2s.src = "pics/topmenu1.jpg";
BtTM2b =  new Image();
BtTM2b.src = "pics/topmenu1b.jpg";
BtTM3s =  new Image();
BtTM3s.src = "pics/topmenu2.jpg";
BtTM3b =  new Image();
BtTM3b.src = "pics/topmenu2b.jpg";
BtTM4s =  new Image();
BtTM4s.src = "pics/topmenu3.jpg";
BtTM4b =  new Image();
BtTM4b.src = "pics/topmenu3b.jpg";
}