BLANK_IMAGE = '/images/b.gif';

var lastTip = null;

function setVis(id, value, align) 
{
	var o;
	if (document.getElementById && (o = document.getElementById(id)) && o.style)
	{
		o.style.visibility = value;
		o.style.textAlign = align;
		//o.style.paddingRight = "28px";
	}
}

function show(id,align) 
{
	setVis(id, 'visible', align);
}

function hide(id,align) 
{
	setVis(id, 'hidden', align);
}

function navTip(id,align) 
{
	if (lastTip)
		hide(lastTip,align);
	show(id,align);
	lastTip = id;
}