function moveBox(position){
   var effect = new Fx.Style('bigBox', 'marginLeft', {
      duration: 200,
      transition: Fx.Transitions.Sine.easeInOut
   });

   var left = document.getElementById("bigBox").style.marginLeft;
   if (left == "")
      left = 0;

   effect.start(parseInt(-(518*position)));
}