var counterDiapo ;
var tableImages ;
counterDiapo  = 0;

function changeImage(nomIm,src)
{
  document.images[nomIm].src = src;
}

function diaporama(nomImage,tabImage){
  counter=Math.random()*12;
  counterDiapo=Math.round(counter);
  tableImages = tabImage;  
  changeImage(nomImage ,tableImages[counterDiapo].src);
  setTimeout("diaporama('" + nomImage + "',tableImages)",1000);
}