function doShowHide(popupMenu) {
	/* This function launches when the visitor mouses over the navbar choices. It receives the ID of the corresponding menu and makes this menu visible while hiding the other four. */
		//if (popupMenu == "menu1") {
			//document.getElementById("menu1").style.visibility="visible";
			//document.getElementById("menu2").style.visibility="hidden";
			//document.getElementById("menu3").style.visibility="hidden";
			//document.getElementById("menu4").style.visibility="hidden";
			//document.getElementById("menu5").style.visibility="hidden";
			//document.getElementById("submenu1").style.visibility="hidden";
			//document.getElementById("submenu2").style.visibility="hidden";
			//document.getElementById("submenu3").style.visibility="hidden";
			//document.getElementById("submenu4").style.visibility="hidden";
		//}
		if (popupMenu == "menu2") {
			//document.getElementById("menu1").style.visibility="hidden";
			document.getElementById("menu2").style.visibility="visible";
			document.getElementById("menu3").style.visibility="hidden";
			document.getElementById("menu4").style.visibility="hidden";
			document.getElementById("menu5").style.visibility="hidden";
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
		if (popupMenu == "menu3") {
			//document.getElementById("menu1").style.visibility="hidden";
			document.getElementById("menu2").style.visibility="hidden";
			document.getElementById("menu3").style.visibility="visible";
			document.getElementById("menu4").style.visibility="hidden";
			document.getElementById("menu5").style.visibility="hidden";
		}
		if (popupMenu == "menu4") {
			//document.getElementById("menu1").style.visibility="hidden";
			document.getElementById("menu2").style.visibility="hidden";
			document.getElementById("menu3").style.visibility="hidden";
			document.getElementById("menu4").style.visibility="visible";
			document.getElementById("menu5").style.visibility="hidden";
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
		if (popupMenu == "menu5") {
			//document.getElementById("menu1").style.visibility="hidden";
			document.getElementById("menu2").style.visibility="hidden";
			document.getElementById("menu3").style.visibility="hidden";
			document.getElementById("menu4").style.visibility="hidden";
			document.getElementById("menu5").style.visibility="visible";
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
	}

	function doShowHideSub(popupMenu) {
	/* This function launches when the visitor mouses over the navbar choices. It receives the ID of the corresponding menu and makes this menu visible while hiding the other four. */
		if (popupMenu == "submenu1") {
			document.getElementById("submenu1").style.visibility="visible";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
		if (popupMenu == "submenu2") {
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="visible";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
		if (popupMenu == "submenu3") {
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="visible";
			document.getElementById("submenu4").style.visibility="hidden";
		}
		if (popupMenu == "submenu4") {
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="visible";
		}
	}
	
	function doHide(popupMenu) {
		/* This function launches when the visitor clicks the Close button at the bottom of the menu. It receives the ID of the current menu and then hides that menu */
		document.getElementById(popupMenu).style.visibility="hidden";
		if (popupMenu == "menu3") {
			document.getElementById("submenu1").style.visibility="hidden";
			document.getElementById("submenu2").style.visibility="hidden";
			document.getElementById("submenu3").style.visibility="hidden";
			document.getElementById("submenu4").style.visibility="hidden";
		}
	}