var n=0;
var l;
function nextCS() {
  if ( n > 3 || n == 0 ) {
    l = 3;
    n = 0;
  } else {
    l = n - 1;
  }
  var fout = new Fx.Tween($('study'+l),{'duration':'long'});
  var fin = new Fx.Tween($('study'+n),{'duration':'long'});
  fout.start('opacity',0);
  fin.start('opacity',1).chain(function() {
    n++;
    setTimeout('nextCS();',8000);
  });
  // $('study'+l).tween('opacity',0);
  // $('study'+n).tween('opacity',1);
}

window.addEvent('domready',function() {
  var casestudies = $$('.studyinner');
  casestudies.each(function(el,i){
    el.set('opacity',0);
  });

  nextCS();

});