function detectScrWidth() {
	var scrWidth = document.body.clientWidth;
	if (scrWidth > 800) {
		document.getElementById('mastheadInner').className = 'postcards5';
		//alert("Larger than 800");
	} else {
		document.getElementById('mastheadInner').className = 'postcards3';
		//alert("Smaller than 800");
	}
}
//window.onload = detectScrWidth;