function changeBanner(currentObjectNum){

	if (currentObjectNum == 1){
		var timer = setTimeout("show2()",25000);
	} else {
		var timer = setTimeout("show1()",15000);
	}
}

function show1(){
	document.getElementById('banner1').style.display = 'block';
	document.getElementById('banner2').style.display = 'none';
	changeBanner(1);
}

function show2(){
	document.getElementById('banner2').style.display = 'block';
	document.getElementById('banner1').style.display = 'none';
	changeBanner(2);
}