var iNum = selectFrom(1, 3); //select from between 1 and 3
var iBanner;
var sFunc;
var iIntervalId = null;

function clearLink() {
	document.getElementById("kapcsolat-l").style.display = "none";
	document.getElementById("szol-l").style.display = "none";
	document.getElementById("otletek-l").style.display = "none";
}

function selectFrom(iFirstValue, iLastValue) {
	var iChoices = iLastValue - iFirstValue + 1;
	return Math.floor(Math.random() * iChoices + iFirstValue);
}

function stepUp() {
	if(iNum < 3) iNum++;
	else iNum = 1;
}

function stepDown() {
	if(iNum > 1) iNum--;
	else iNum = 3;
}

function selectBanner(iBanner, sFunc) {
	if(sFunc == "manual") stopRotation();
	if(iBanner == 0) stepDown();
	if(iBanner == 9) stepUp();
	if(0 < iBanner && iBanner < 4) iNum = iBanner;
	clearLink();
	document.getElementById("banner").style.background = "url(" + eval("b_bg0" + iNum + ".src") + ") no-repeat";
	switch(iNum) {
		case 1:
			document.getElementById("kapcsolat-l").style.display = "block";
			break;
		case 2:
			document.getElementById("szol-l").style.display = "block";
			break;
		case 3:
			document.getElementById("otletek-l").style.display = "block";
			break;
	}
	if(sFunc == "manual") startRotation();
}

function startRotation() {
	iIntervalId = setInterval("selectBanner(9, 'auto')", 100000);
}

function stopRotation() {
	clearInterval(iIntervalId);
}