function setup_nav_arrow () {
	var loc = String(window.location).match(/(who-we-are|what-we-do|our-customers|our-green-mission|news-about-us)/);
	if (loc) {
		switch (loc[0]) {
			case 'who-we-are':
				move_arrow(150);
				break;
			case 'what-we-do':
				move_arrow(280);
				break;
			case 'our-customers':
				move_arrow(420);
				break;
			case 'our-green-mission':
				move_arrow(590);
				break;
			case 'news-about-us':
				move_arrow(760);
				break;
		}
	}
}

function move_arrow (left) {
	var arrow = document.getElementById('nav_arrow');
	arrow.style.display = 'block';
	arrow.style.marginLeft = left + 'px';
}

window.onload = setup_nav_arrow;