var lastButton = new String();

function btn (direction,btn) {
	if (document.images) {
		if (!btn) btn = lastButton;
		var newBtn = eval(btn.name + (direction==0 ? 'Up':'Down'));
		if (btn.src!=newBtn.src) btn.src = newBtn.src;
	}
}

function btnAuto( btnRef )
	{
	if (document.images) 
		{
		btn(1,btnRef);
		lastButton = btnRef;
		setTimeout("btn(0)",250);
		}
	}