function nav(i) {
	var nav = document.getElementById("nav" + i);
	var drop = document.getElementById("drop" + i);

	nav.className = "mainNavOn";
	drop.style.display = "block";
}

function off(i) {
	var nav = document.getElementById("nav" + i);
	var drop = document.getElementById("drop" + i);
	
	nav.className = "mainNav";
	drop.style.display = "none";
}