var IDcount = 3;
var IDnum = 0;
var skipper = window.setInterval('skip(IDnum)',4000);
var wait = '';
var isopen = 0;

function skip() {
	IDnum = isopen + 1;
	if(IDnum > IDcount)IDnum = 0;
	document.getElementById('SB'+isopen).style.display = 'none';
	document.getElementById('SB'+IDnum).style.display = 'block';
	isopen=IDnum;
	}

function skipTo(ID) {
	document.getElementById('SB'+ID).style.display = 'block';
	if(ID!=IDnum)document.getElementById('SB'+IDnum).style.display = 'none';
	IDnum=ID;
	isopen=ID;
	stopIt()
	}
	
function stopIt() {
	window.clearInterval(skipper);
	window.clearTimeout(wait);
	}
	
function runIt() {
	skipper = window.setInterval('skip()',4000);
	}
	
function runLater() {
	wait = window.setTimeout('runIt()',4000);
	}