function menuSwitch(backgroundImage, backgroundPosition) {
	if (
		typeof backgroundImage != "undefined" 
		&& 
		typeof backgroundPosition != "undefined"
	) {
		document.getElementById('introimage').style.background = 'url(/includes/intromenu/' + backgroundImage + ') no-repeat ' + backgroundPosition;
	}
	else {
		document.getElementById('introimage').style.background = 'url(/includes/intromenu/default.jpg) no-repeat bottom right';
	}
}