bon = new Image();
	bon.src = 'i/b-on.jpg';

	function turnOn(i)
	{
		document.getElementById(i).style.backgroundImage = "url('i/b-on.jpg')";
	}

	function turnOff(i)
	{
		document.getElementById(i).style.backgroundImage = "url('i/b-off.jpg')";
	}

	function goUrl(u)
	{
		location.href = u;
	}