function toggle(id) {
	var div;
	if (div = document.getElementById(id)){
		if (div.style.display == "block") {
			hide(id);
		} else {
			show(id);
		}
	}
}
function hide(id) {
	var div;
	if (div = document.getElementById(id))
		div.style.display = "none";
}
function show(id) {
	var div;
	if (div = document.getElementById(id))
		div.style.display = "block";
}