var n_img = 0;
function proxImg(img_src, caminho)
{
	if ((n_img+1) > (array_img.length-1))
		n_img = 0;
	else
		n_img = n_img + 1;
	trocaImgLayer(img_src, caminho + array_img[n_img][0], array_img[n_img][1]);
}
function imgAnt(img_src, caminho)
{
	if ((n_img-1) < 0)
		n_img = (array_img.length-1);
	else
		n_img = n_img - 1;
	trocaImgLayer(img_src, caminho + array_img[n_img][0], array_img[n_img][1]);
}
function trocaImgLayer()
{
	if (document.images)
	{
		document.getElementById(trocaImgLayer.arguments[0]).src = "imagens/fotos/albuns/carregando.gif";
		document.getElementById(trocaImgLayer.arguments[0]).src = trocaImgLayer.arguments[1] + ".jpg";
		document.getElementById('legenda_ampliada').innerHTML = trocaImgLayer.arguments[2];
		
		if (n_img == 0) // se for primeira foto
			document.getElementById('foto_anterior').style.display='none';
		else
			document.getElementById('foto_anterior').style.display='block';

		if (n_img == array_img.length - 1) // se for ultima foto
			document.getElementById('foto_proxima').style.display='none';
		else
			document.getElementById('foto_proxima').style.display='block';
	}
}

function mostra(id_layer)
{
	document.getElementById(id_layer).style.display = "block";
}
function esconde(id_layer)
{
	document.getElementById(id_layer).style.display = "none";
}