var index=0;
var rotation_started=0;

// Array items should be prevously declared

function openAdvertisement(increment) {
	index = index + increment;
	if (index == items.length) index = 0;
	if (index == -1) index = items.length-1;
	var banner_img = document.getElementById('banner_img');
	var banner_url = document.getElementById('banner_url');
//	banner_img.alt=items[index][0];
	banner_img.src=items[index][0];
//	banner_url.title=items[index][0];
	banner_url.href=items[index][1];
	banner_url.target = items[index][2];
}

function changeAdvertisement() {
	if (banners_available) { changeAdvertisementInfinite(); }
}

function changeAdvertisementInfinite() {
	if (rotation_started == 0) {
		rotation_started = 1;
	}
	else openAdvertisement(1);
	setTimeout('changeAdvertisement()', 7*1000);
}