function isEmpty(inputStr) {
	// alert("in isEmpty (inputStr = \"" + inputStr + "\")");

	if ((inputStr == null) || (inputStr == "")) {
		return true;
	}
	return false;
}

function isInteger(inputVal) {
	// alert("in isEmpty (inputVal = \"" + inputVal + "\")");

	inputStr = inputVal.toString()
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)
		if ((i == 0) && (oneChar == "-")) {
			continue
		}

		if ((oneChar < "0") || (oneChar > "9")) {
			return false
		}
	}
	return true
}

function isNumber(inputVal) {
	// alert("in isEmpty (inputVal = \"" + inputVal + "\")");

	oneDecimal = false
	inputStr = inputVal.toString()
	for (var i = 0; i < inputStr.length; i++) {
		var oneChar = inputStr.charAt(i)
		if ((i == 0) && (oneChar == "-")) {
			continue
		}

		if ((oneChar == ".") && (!oneDecimal)) {
			oneDecimal = true
			continue
		}

		if ((oneChar < "0") || (oneChar > "9")) {
			return false
		}
	}
	return true
}