var activated = null;

function overlayHref(ids)
{
	var id_array = ids.split(",");

	for (var i=0; i < id_array.length; i++)
	{
		var item = document.getElementById(id_array[i]);
		if (item.style.visibility == 'hidden') {
			item.style.visibility = 'visible';
			item.style.display = 'inline';
		}
		else {
			item.style.visibility = 'hidden';
			item.style.display = 'none';
		}
	}
}

function overlayMouseOver(id)
{
	if(activated)
	{
		activated.style.visibility = "hidden";
	}
	var item = document.getElementById(id);
	if(item) { item.style.visibility = "visible"; }
	activated = item;
}

function overlayMouseOut(id)
{
	var item = document.getElementById(id);
	if(item == activated && item)
	{
		activated.style.visibility = "hidden";
	}
}