function show(id) {
	document.getElementById(id).style.display = "block";
}
function hide(id) {
	document.getElementById(id).style.display = "none";
	}
function tab(i) {
	var list = document.getElementById('subnav');
	var items = list.getElementsByTagName('li');
	items[i-1].className = "on";
	

	}