function prevDay(){
	$jours = $$('#slider li');
	$jour = $$('#slider li.selected')[0];

	for(var i = 0;i<$jours.length;i++){
		if($jours[i]['id'] == $jour['id']){
			var $i = i;
		}
	}

	if($($jours[$i]['id'])){
		var $numero = parseInt($jours[$i-1]['id'].substring(5,6));
		document.location.href = $('link_'+parseInt($numero)).href;	
	}
}

function nextDay(){
	$jours = $$('#slider li');
	$jour = $$('#slider li.selected')[0];

	for(var i = 0;i<$jours.length;i++){
		if($jours[i]['id'] == $jour['id']){
			var $i = i;
		}
	}

	if($($jours[$i]['id'])){
		var $numero = parseInt($jours[$i+1]['id'].substring(5,6));
		document.location.href = $('link_'+parseInt($numero)).href;	
	}
}