banners = new Array(4);
alts = new Array(4);
links = new Array(4);
var countBanner = 0;
var indexBanner = 0;
var delay = 6000;
var timer;
function addBanner(obraz, opis, link) {
	banners[countBanner] = "banners/"+obraz;
	alts[countBanner] = opis;
	countBanner = countBanner+1;
}
function runBanner() {
		setBanner(0)
}
function setBanner(index) {
	if (countBanner > 0) {
		clearInterval(timer);
		indexBanner = index;
		document.banner.src = banners[indexBanner];
		document.banner.alt = alts[indexBanner];
		timer = setInterval("nextBanner()",delay);
	}
}
function nextBanner() {
	if (indexBanner >= countBanner-1) {
		indexBanner = 0;
	} else {
		indexBanner = indexBanner + 1;
	}
	setBanner(indexBanner);
}
function previousBanner() {
	if (indexBanner <= 0) {
		indexBanner = countBanner-1;
	} else {
		indexBanner = indexBanner - 1;
	}
	setBanner(indexBanner);
}