var items = new Array(), current=0, duration=2.0, interval=5000;

function hs_init(){
  current=0;
  items = $$('#imageContainer div')
  items.first().appear({duration:0.5})
  items.last().fade({duration:0.5});
  setTimeout(hs_fade,interval);
}

function hs_fade(){
  if (items[current+1]){
    items[current].fade({duration:duration});
    items[current+1].appear({duration:duration});
    current = current + 1;
    setTimeout(hs_fade,interval);
  }
}