var pagina = 1;
var maximo = 4;
var timer = null;

function load_img() {
	i1 = new Image(); i1.src = "images/1.png";
	i2 = new Image(); i2.src = "images/tab/tab1dir.gif";
	i3 = new Image(); i3.src = "images/tab/tab1dirfoco.gif";
	i4 = new Image(); i4.src = "images/tab/tab1dirsel.gif";
	i5 = new Image(); i5.src = "images/tab/tab1dirselfoco.gif";
	i6 = new Image(); i6.src = "images/tab/tab1esq.gif";
	i7 = new Image(); i7.src = "images/tab/tab1esqfoco.gif";
	i8 = new Image(); i8.src = "images/tab/tab1esqsel.gif";
	i9 = new Image(); i9.src = "images/tab/tab1esqselfoco.gif";
	i10 = new Image(); i10.src = "images/tab/tab1meio.gif";
	i11 = new Image(); i11.src = "images/tab/tab1meiofoco.gif";
	i12 = new Image(); i12.src = "images/tab/tab1meiosel.gif";
	i13 = new Image(); i13.src = "images/tab/tab1meioselfoco.gif";
	i14 = new Image(); i14.src = "images/tab1-sel.gif";
	i14 = new Image(); i14.src = "images/tab1-normal.gif";
	i15 = new Image(); i15.src = "images/chat-hover.gif";
	i16 = new Image(); i16.src = "images/chat_normal.gif";
}

function proxima() {
	desliga();
	pg = pagina + 1;
	if ( pg > maximo ) {
		pg = 1;
	}
	pag(pg, 1);
	liga();
}

function liga() {
	if ( timer == null ) {
		timer = setTimeout("proxima();",4500);
	}
}

function desliga() {
	if ( timer != null ) {
		clearTimeout(timer);
		timer = null;
	}
}
	
function pag(pg, efeito) {
	if ( pagina != pg ) {
		var objTab = document.getElementById("tab"+pg);
		document.getElementById("tb"+pg).className = "tabsel";
		document.getElementById("tb"+pagina).className = "tab";
		if (efeito == 1) {
			$("#tab"+pagina).fadeOut( 350, function(){ $("#tab"+pg).fadeIn(350); } );
		} else {
			$("#tab"+pagina).hide();
			objTab.style.display = "";
		}
		pagina = pg;
	}
}