$(document).ready(function() {
	
	//slideshow
	if ($("#slideshow img").length>1) {
		$("#slideshow").cycle({
			fx:    'fade', 
			speed:  1000,
			timeout: 0,
			next: '#next',
			prev: '#previous',
			pager:  '#nav ul', 
			pagerAnchorBuilder: function(idx, slide) {
				return '<li><a href="#" class="skinh"><img src="' + slide.src + '" /></a></li>';
				elmNav = elmNav+1;
			},
			prevNextClick: function(isn, proximo, slide) {
				thumbnav(proximo);
			}
		});
	}
	
	//mostra/esconde thumbnails
	$("#maisfotos").click(function(){
		if ($("#nav").is(":visible")) $("#nav").hide(); else $("#nav").show();
		return false;
	});
	
	//navega pelos thumbnails
	elmNav = $("#nav ul li").length;
	pgNavTot = Math.ceil(elmNav/3)-1;
	thumbnavpage(0);
	$("#nav-next").click(function(){
		if ((pgNav+1)>pgNavTot) pgNav = 0; else pgNav = pgNav+1;
		thumbnavpage(pgNav);
	});
	$("#nav-previous").click(function(){
		if ((pgNav-1)<0) pgNav = pgNavTot; else pgNav = pgNav-1;
		thumbnavpage(pgNav);
	});
	
	//barrinha da direita
	$("#slideshow").after('<div id="barrinha" class="skin"></div> ');

});

function thumbnav(proximo){
	if (proximo==0 || proximo%3==0 || (proximo-2)%3==0) {
		if ((proximo-2)%3==0) proximo = proximo-2;
		pgNav = proximo/3;
		thumbnavpage(pgNav)
	}
}

function thumbnavpage(pgNav) {
	$("#nav li").hide();
	proximo = 3*pgNav;
	$("#nav li:eq("+(proximo)+")").show();
	$("#nav li:eq("+(proximo+1)+")").show();
	$("#nav li:eq("+(proximo+2)+")").show();
}