var images = new Array();
var titles = new Array();
var selected = 0;

function openImage(imgId)
{
	if(images[imgId])
	{
		var bigImage = document.getElementById('bigImage');
		var titleImage = document.getElementById('imageTitle');

		bigImage.src = images[imgId];

		unselectThumb(selected);

		selected = imgId;
		
		selectThumb(selected);

		bigImage.onload = changeTitle;
		titleImage.innerHTML = 'Carregando...';
	}
};

	
function changeTitle()
{
	var titleImage = document.getElementById('imageTitle');
	titleImage.innerHTML = titles[selected];
}

function selectThumb(imgId)
{

	if(thumb = document.getElementById('thumb_'+imgId))
	{
		thumb.className = 'selectedThumb';
	}
}

function unselectThumb(imgId)
{
	if(thumb = document.getElementById('thumb_'+imgId))
	{
		thumb.className = 'thumb';
	}
}

function nextImage()
{	
	var nxt = selected+1;
	if(nxt >= images.length) nxt = 0;
	openImage(nxt);
};

function prevImage()
{
	var prv = selected-1;
	if(prv < 0 ) prv = images.length-1;
	openImage(prv);
};