// Fotografias
var ntelas=7; // numero de fotografias
var tela=1;  // tela visivel (default)
var telav=1;
var auto = 0;

var img1 = new Image(); img1.src = "imagens/play.gif"
var img2 = new Image(); img2.src = "imagens/playy.gif"

function avanca_tela(a) {
    if (tela!=ntelas) {
        telav = tela;
    	tela++;
    }   else {
        telav = ntelas;
        tela = 1;
    }
    if ((auto==1) && (a==1)) parar();
    document.getElementById("tela"+telav).style.display = "none";
    document.getElementById("tela"+tela).style.display = "block";

    document.getElementById("num"+tela).style.border = "1px solid #9A665D";
    document.getElementById("num"+telav).style.border = "0px";
}

function retrocede_tela(a) {
    if (tela!=1) {
        telav = tela;
    	tela--;
    } else {
        telav = 1;
    	tela = ntelas;
    }
    if ((auto==1) && (a==1)) parar();
    document.getElementById("tela"+telav).style.display = "none";
    document.getElementById("tela"+tela).style.display = "block";

    document.getElementById("num"+tela).style.border = "1px solid #9A665D";
    document.getElementById("num"+telav).style.border = "0px";
}

function directo(a) {
	parar();
	telav = tela;
	tela = a;
    document.getElementById("tela"+telav).style.display = "none";
    document.getElementById("tela"+tela).style.display = "block";

    document.getElementById("num"+tela).style.border = "1px solid #9A665D";
    document.getElementById("num"+telav).style.border = "0px";
}

function automatico() {
	if (auto==0) {
    	auto = 1;
		inter = setInterval("avanca_tela(2)", 8000);
        document.getElementById('play').src = img2.src;
    }
}

function parar() {
	if (auto==1) {
		inter = clearInterval(inter);
		auto = 0;
        document.getElementById('play').src = img1.src;
    }
}

function ampliar(num) {
  if (num==0) num = tela;
  window.open("comum/fotog.php?num="+num,"_blank","top=0,left=0,position=5,toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=0,width=1000,height=750");

}