var current_img = 1;
var diapo_is_on = false;
var timer;

function load_img(img, link, num)
{
	var i = $(img);
	i.src = link.href;
	
	var liste = $('liste_photos');
	var l = liste.getElementsByTagName('a');
	for(var i=0;i<l.length;i++)
	{
		l[i].className='';
	}
	link.className = 'on';
	
	current_img = num;
}

function diapo()
{
	
	if (!diapo_is_on)
	{
		diapo_is_on = true;
		next_photo();
		timer = setInterval("next_photo()", 4000);
	}
	else
	{
		diapo_is_on = false;
		clearInterval(timer);
	}
	
}

function next_photo()
{
	var liste = $('liste_photos');
	var l = liste.getElementsByTagName('a');
	var max = l.length;
	
	current_img++;
	if (current_img > max) current_img = 1;
	var i = $('photo'+current_img);
	if (i) load_img('img_diapo', i, current_img);
}