function showSubNav(thisNav) {
		document.getElementById(thisNav).style.display = "block";
	}
	function hideSubNav(thisNav) {
		document.getElementById(thisNav).style.display = "none";
	}
	function hideSubNavAll() {
		document.getElementById("subnav1").style.display = "none";
		document.getElementById("subnav2").style.display = "none";
		document.getElementById("subnav3").style.display = "none";
	}