function areaEnableCheck() {
	var sel_pref = '';
	var sel_area = '';
	
	for (var i=0;i<47;i++) {
		if (document.getElementById('pref['+i+']').checked == true) {
			if (sel_pref=='') {
				sel_pref = i;
			} else {
				sel_pref = 0;
				break;
			}
		}
	}
	switch (sel_pref) {
	case 7:	
		sel_area = 'area_obj1';
		break;
	case 8:
		sel_area = 'area_obj2';
		break;
	case 9:
		sel_area = 'area_obj4';
		break;
	case 10:
		sel_area = 'area_obj3';
		break;
	case 24:
		sel_area = 'area_obj5';
		break;
	case 29:
		sel_area = 'area_obj6';
		break;
	default:
		sel_area = 'area_obj0';
		break;
	}
	areaEnableObject(sel_area);
	return true;
}

function areaEnableObject(area_obj) {
	var obj = '';
	var chk = '';
	for (var i=0;i<7;i++) {
		obj = document.getElementById('area_obj'+i);
		obj.style.display = ('area_obj'+i == area_obj)?'table':'none';
		chk = obj.getElementsByTagName('input');
		for (var n=0;n<chk.length;n++) {
			if ('area_obj'+i == area_obj) {
				chk[n].disabled = false;
			} else {
				chk[n].disabled = true;
			}
		}
	}
}

if (window.addEventListener){
	window.addEventListener("load", areaEnableCheck, false);
}else if (window.attachEvent){ //for IE
	window.attachEvent("onload", areaEnableCheck);
}else{
	window.onload = areaEnableCheck;
}