window.onload = function() {
	setDis();
	var e = document.getElementById('same_as_above');
	if(e) {
		e.onclick = setDis;
	}
}

function setDis() {
	var e = document.getElementById('same_as_above');
	var sh1 = document.getElementById('shipping_address1');
	var sh2 = document.getElementById('shipping_address2');
	if(e) {
		if(sh1 && sh2) {
			sh1.disabled = e.checked;
			sh2.disabled = e.checked;
		}
	}
}