function toggle(which) {
	var cnt; var y; 
	
	var chk = false;
	y = document.getElementById('chk' + which);
	if (y != null) {
		chk = y.checked;
	} else {
		chk = false;
	}
	
	for (cnt = 1; cnt <= 3; cnt++) {
		var x = which + cnt;
		var id = document.getElementById(x);
		if (id != null) { 
			if (chk) { 
				id.style.display = "inline";
			} else {
				id.style.display = "none";
			}
		}
		
		x = "chk" + which + cnt;
		id = document.getElementById(x);
		if (id != null) {
			id.checked = chk;
		}
	}	
}