function toggle_menu(id) {
	var box = document.getElementById('box_' + id);
	var img = document.getElementById('arrow_' + id);

	var _to;

	if (box.style.height == "0px")
	{
		_to = box.scrollHeight;
		img.src = 'images/arrow_up.gif';
	}
	else {
		_to = 0;
		img.src = 'images/arrow_down.gif';
	}

	var anim = new YAHOO.util.Anim(
		box.id,
		{
			height:
			{
				to: _to
			}
		},
		0.5,
		YAHOO.util.Easing.easeOut
	);
	anim.animate();
}