<!-- hide
var Count = 0;
function preload(name, first, second) {
  if (browserOK) { 
    pics[Count] = new Array(3);
    pics[Count][0] = new Image();
    pics[Count][0].src = first;
    pics[Count][1] = new Image();
    pics[Count][1].src = second;
    pics[Count][2] = name;
    Count++;
  }
}
function on(name){
if (browserOK) {
  for (i = 0; i < Count; i++) {
    if (document.images[pics[i][2]] != null)
      if (name != pics[i][2]) { 
        document.images[pics[i][2]].src = pics[i][0].src;
      } else {
         document.images[pics[i][2]].src = pics[i][1].src;
      }
    }
  }
}
function off(){
  if (browserOK) {
    for (i = 0; i < Count; i++) {
      if (document.images[pics[i][2]] != null) 
      document.images[pics[i][2]].src = pics[i][0].src;
    }
  }
}
preload("bt1", "img/fst/bt11.gif", "img/fst/bt12.gif");
preload("bt2", "img/fst/bt21.gif", "img/fst/bt22.gif");
preload("bt3", "img/fst/bt31.gif", "img/fst/bt32.gif");
// -->