_fotoSelecionada=false;
_slideShow=false;
_slideShowTempo=5000;
_slideShowLoop=false;

var L=location.href;
var d=L.substring(L.indexOf("?")+1);


// navegacao
function iniciar(){
	acharPosicao();
}

function acharPosicao(){
	var lnks=document.getElementById("thumbs").getElementsByTagName("a");
	if (d == 1) {
		var _fotosd = Array();
		_fotosd=L.split("?");
		_fotoSelecionada=_fotosd[0];
	} else {
		_fotoSelecionada = L;
	}
	if(!_slideShowLoop){
		document.getElementById("btAnterior").style.display=(_fotoSelecionada==lnks[0])? "none" : "block";
		document.getElementById("btProxima").style.display=(_fotoSelecionada==lnks[lnks.length-1])? "none" : "block";
	}	
}

function navegar(dir,slide){
	var n=0;
	var lnks=document.getElementById("thumbs").getElementsByTagName("a");
	for(var i=0; i<lnks.length; i++){
		if(_fotoSelecionada == lnks[i]) {
			n=i;
			break;
		}
	}
	//n=+dir;
	n=n+dir;

	if(n==lnks.length){
		alternarSlideShow(false);
		n=0;
		return;
	}
	
	
	
	if (slide == 1) {
		seguirLink(lnks[n],1);
	} else {	
		seguirLink(lnks[n],0);
	}
}

function seguirLink(l,st){
	if (st == 1) {
		location.href=l.href + "?1";
	} else {
		location.href=l.href;
	}

}

// slideshow
function proxima(){
	navegar(1,1);
}

function alternarSlideShow(st){	
	_slideShow=(st!==undefined)? st : !_slideShow;
	try{
		clearTimeout(_timeoutSlideShow);
	}catch(e){}
	if(_slideShow){
		passoSlideShow();
		document.imgSlideShow.src="http://img.terra.com.br/i/noticias/galeria_1024/parar_slide.gif";
	}else{
		document.imgSlideShow.src="http://img.terra.com.br/i/noticias/galeria_1024/iniciar_slide.gif";
	}

}

function passoSlideShow(){
	if(_slideShow){
		_timeoutSlideShow=setTimeout(proxima, _slideShowTempo);
	}
}