// JavaScript Document
var speed = 5000;
var timer;
var item = 1;

function itemIncrement() {
	item = (item < 4) ? parseInt(item) + 1 : 1;
}

function clearItens() {
	var i;
	for(i = 1; i < 5; i++) {
		document.getElementById('foto-' + item).className = ' ';
		document.getElementById('destaque-' + item).className = ' ';
	}
}

function changeItem() {
	clearItens();
	itemIncrement();
	document.getElementById('foto-' + item).className = 'selected';
	document.getElementById('destaque-' + item).className = 'selected';
}

function stopChange(id) {
	clearInterval(timer);
	clearItens();
	item = id;
	document.getElementById('foto-' + item).className = 'selected';
	document.getElementById('destaque-' + item).className = 'selected';
}

function nextChange(id) {
	clearItens();
	item = id;
	itemIncrement();
	startChange(item);
}

function startChange(id) {
	item = id;
	clearItens();
	document.getElementById('foto-' + item).className = 'selected';
	document.getElementById('destaque-' + item).className = 'selected';
	timer = setInterval(changeItem, speed);
}

startChange(1);