img=0;
 function img_rotate() {
  if ((++img)>9) img=0;
   switch (img) {
case 0:
  document.img.src = 'fotos/index/01.jpg';
  break;
case 1:
  document.img.src = 'fotos/index/02.jpg';
  break;
case 2:
  document.img.src = 'fotos/index/03.jpg';
  break;
case 3:
  document.img.src = 'fotos/index/04.jpg';
  break;
case 4:
  document.img.src = 'fotos/index/05.jpg';
  break;
case 5:
  document.img.src = 'fotos/index/06.jpg';
  break;
case 6:
  document.img.src = 'fotos/index/07.jpg';
  break;
case 7:
  document.img.src = 'fotos/index/08.jpg';
  break;
case 8:
  document.img.src = 'fotos/index/09.jpg';
  break;
case 9:
  document.img.src = 'fotos/index/10.jpg';
  break;

       default:
        break;
   }
  window.setTimeout('img_rotate();',4000);
 }