var seconds = 4;
var index = 0;
var tab = new Array();
        
changerImage = function () {
  var choisies = new Array();
  var txt;
  var txt2,
  txt = "";
  txt2 = "";
  for (i = 0 ; i < 12 ; i++)
  {
	var alea;
	alea = -1;
	var dejaVu = true;
	while (dejaVu || alea < 0)
	{
		dejaVu = false;
		alea = Math.round(Math.random()*(tab.length-1));
		for (j = 0 ; j < choisies.length ; j++)
		{
			if (choisies[j] == alea)
				dejaVu = true;
		}
	}
	if (i < 6)
		txt = txt + '<img src="images/references/'+tab[alea]+'" width="94px" style="margin:0; margin-top:7px; margin-left:3px; margin-right:3px;" />';
	else
		txt2 = txt2 + '<img src="images/references/'+tab[alea]+'" width="94px" style="margin:0; margin-top:7px; margin-left:3px; margin-right:3px;" />';
	choisies[i] = alea;
  }
  var img = document.getElementById("ref_haut");
  var img2 = document.getElementById("ref_bas");
  img.innerHTML = txt;
  img2.innerHTML = txt2;
}
    
charge_images = function ()
{
for (i = 0 ; i < tab.length ; i++)
{
	img = new Image;
	img.src = "images/references/"+tab[i];
}
}	

window.onload = function () {
  var interval = setInterval(changerImage, seconds*1000);
}