/*
	Global "swap" holder
	Use value, null, if no layer initially visible
	*/
	var currLayerId = "home_text";

	function togLayer(id)
	{
	if(currLayerId) setDisplay(currLayerId, "none");
	if(id)setDisplay(id, "block");
	currLayerId = id;
	}

	function setDisplay(id,value)
	{
	var elm = document.getElementById(id);
	elm.style.display = value;
	}
	
	function togHome() {
		togLayer('home_text');
		showBillboard();
	}