var i = 0;

function startTime(pocet){
	var time= new Date();
	hours= time.getHours();
	mins= time.getMinutes();
	secs= time.getSeconds();
	closeTime=hours*3600+mins*60+secs;
	closeTime+=4; // How many seconds til the next rotation
	Timer(pocet);
}

function Timer(pocet){
	var time= new Date();
	hours= time.getHours();
	mins= time.getMinutes();
	secs= time.getSeconds();
	curTime=hours*3600+mins*60+secs
	if (curTime>=closeTime){
		if (i < pocet){ // This is the amount of banners that you have
		i++;
		document.banner.src = eval("banner" + i + ".src");
		} else {
			i = 1;
			document.banner.src = eval("banner" + i + ".src");
		}
	startTime(pocet);
	}
	else {
		window.setTimeout("Timer("+pocet+")",1000)
	}
}