function setVisibility(id, visibility) {
		if (visibility == "none") {
			document.getElementById("spot" + id).style.filter = "alpha(opacity=100)";
			document.getElementById("spot" + id).style.opacity = 1;
			}
		else	{
			document.getElementById("spot" + id).style.filter = "alpha(opacity=0)";
			document.getElementById("spot" + id).style.opacity = 0;
		}
		document.getElementById("sub" + id).style.display = visibility;
		}

	function setStart() {
		document.getElementById("sub2").style.display = "none";
		document.getElementById("sub3").style.display = "none";
		document.getElementById("sub4").style.display = "none";
		document.getElementById("sub5").style.display = "none";
		document.getElementById("sub6").style.display = "none";
		document.getElementById("sub7").style.display = "none";
		document.getElementById("sub8").style.display = "none";
		document.getElementById("sub9").style.display = "none";
		document.getElementById("sub10").style.display = "none";
		document.getElementById("sub11").style.display = "none";
		document.getElementById("sub12").style.display = "none";
		document.getElementById("sub13").style.display = "none";
		document.getElementById("sub14").style.display = "none";
		document.getElementById("sub15").style.display = "none";
		}