function logicSwitch(flag, targetobj) {
	if (targetobj.length == undefined) {
		targetobj.disabled = flag;
	} else {
		for (var i=0; i<targetobj.length; i++) {
			targetobj[i].disabled = flag;
		}
	}
}

function checkInput(obj) {
	return obj.value != "";
}

function checkRadio(obj) {
	if (obj.length == undefined) {
		return obj.checked;
	} else {
		for (var i=0; i<obj.length; i++) {
			if (obj[i].checked)
				return true;
		}
		return false;
	}
}