function showSF(object){
	if (object.checked) {
		document.getElementById('f1').style.display = 'block';
		for (i = 1; i <= 16; i++) document.getElementById("form_data_2_"+i).disabled = false;
	} else {
		document.getElementById('f1').style.display = 'none';
		for (i = 1; i <= 16; i++) document.getElementById("form_data_2_"+i).disabled = true;
	}
}