var curpage = 1;
var numpages = 4;
var timer=null;
var stopped = false;

function fnc_step(nro) 
{
	if (curpage == 0 || curpage>numpages)
	{curpage=1;}

	curpage = nro;

	document.getElementById('notax').innerHTML = document.getElementById('nota_'+curpage).innerHTML;


	for (a=1;a<=4;a++) {
		document.getElementById('rota_bt_'+a).src = '/images/icon/icon-'+a+'-2.gif';
	}
	document.getElementById('rota_bt_'+curpage).src = '/images/icon/icon-'+curpage+'-1.gif';
	

	if(!stopped)
	{
		clearTimeout(timer);
		start();
	}
}


function fnc_next()
{
	if (curpage == 0 || curpage>numpages)
	{curpage=1;}

	curpage++;
	if (curpage>numpages) curpage = 1;

	document.getElementById('notax').innerHTML = document.getElementById('nota_'+curpage).innerHTML;
	

	for (a=1;a<=4;a++) {
		document.getElementById('rota_bt_'+a).src = '/images/icon/icon-'+a+'-2.gif';
	}
	document.getElementById('rota_bt_'+curpage).src = '/images/icon/icon-'+curpage+'-1.gif';



	if(!stopped)
	{
		clearTimeout(timer);
		start();
	}

}


function fnc_prev()
{
	if (curpage == 0 || curpage>numpages)
		curpage=1;


	curpage--;
	if (curpage<=0)	curpage = numpages;

	document.getElementById('notax').innerHTML = document.getElementById('nota_'+curpage).innerHTML;


	for (a=1;a<=4;a++) {
		document.getElementById('rota_bt_'+a).src = '/images/icon/icon-'+a+'-2.gif';
	}
	document.getElementById('rota_bt_'+curpage).src = '/images/icon/icon-'+curpage+'-1.gif';


	
	if(!stopped)
	{
		clearTimeout(timer);
		start();
	}
}

function stop() {
	if (!(stopped)) {
		clearTimeout(timer);
		stopped=true;
	}
}

function start() {
	timer=setTimeout('fnc_next()',6000);
	stopped=false;
}


function stopstart() 
{
	if (stopped) {
		document.getElementById('rota_bt_pause').src = '/images/bt/bt-pausa.gif';
		start();
	} else {
		document.getElementById('rota_bt_pause').src = '/images/bt/bt-pausa-2.gif';
		stop();
	}
}