function showBox1() {
var box1 = document.getElementById('promo1');
var box2 = document.getElementById('promo2');
var box3 = document.getElementById('promo3');
		if (box1.style.display == "none") {
			box1.style.display = "block";
			box2.style.display = "none";
			box3.style.display = "none";
					}
			}

function showBox2() {
var box1 = document.getElementById('promo1');
var box2 = document.getElementById('promo2');
var box3 = document.getElementById('promo3');
		if (box2.style.display == "none") {
			box1.style.display = "none";
			box2.style.display = "block";
			box3.style.display = "none";
					}
			}
			
function showBox3() {
var box1 = document.getElementById('promo1');
var box2 = document.getElementById('promo2');
var box3 = document.getElementById('promo3');
		if (box3.style.display == "none") {
			box1.style.display = "none";
			box2.style.display = "none";
			box3.style.display = "block";
					}
			}