var banner_1 = 1;
var banner_2 = 1;

self.document.getElementById('banner_switch_1_2').style.display = "none";
self.document.getElementById('banner_switch_2_2').style.display = "none";

function change() {
	if (banner_1 == 1) {
		banner_1 = 2;
		self.document.getElementById('banner_switch_1_1').style.display = "none";
		self.document.getElementById('banner_switch_1_2').style.display = "block";
	}
	else {
		banner_1 = 1;
		self.document.getElementById('banner_switch_1_1').style.display = "block";
		self.document.getElementById('banner_switch_1_2').style.display = "none";
	}
	
	if (banner_2 == 1) {
		banner_2 = 2;
		self.document.getElementById('banner_switch_2_1').style.display = "none";
		self.document.getElementById('banner_switch_2_2').style.display = "block";
	}
	else {
		banner_2 = 1;
		self.document.getElementById('banner_switch_2_1').style.display = "block";
		self.document.getElementById('banner_switch_2_2').style.display = "none";
	}
}

var aktiv = window.setInterval("change()", 7000);