var diapo = new Array();
var nbimgs = 22;
var imgid = 0;

function preloadDiapo()
{
	for (i = 0; i < nbimgs; i++)
	{
		diapo[i] = new Image();
		diapo[i].src = 'imgs/diapo/' + (i + 1) + '.jpg';
	}
}

function switchImg(img, id)
{
	if (document.images)
	{
		document.images[img].src = diapo[id].src;
		imgid ++;
		
		if (imgid >= nbimgs)
		{
			imgid = 0;
		}
		
		setTimeout('switchImg(\'' + img + '\', ' + imgid + ')', 3000);
	}
}

preloadDiapo();
setTimeout('switchImg(\'diapo\', 1)', 3000);