function expand (xID) {
		var x = new Array ();
		x[1] = document.getElementById ('expand_1');
		x[2] = document.getElementById ('expand_2');
		x[3] = document.getElementById ('expand_3');
		
		for (var i = 1; i <= 3; i++) {
			if (i==xID) {
				x[i].style.display = "inline";
				x[i].style.visibility = "visible";
			} else {
				x[i].style.display = "none";
				x[i].style.visibility = "hidden";
			}
		}
	}